Ocm amplifier

Display manufacturing details such as module type, software version, boot versions and so on, for the integrated photonic line card IPLC module and hardware components. Table 1 lists the output fields for the show chassis fpc optical-properties mfg info command. Output fields are listed in the approximate order in which they appear. Table 1: show chassis fpc optical-properties mfg info Output Fields.

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Content:

• OCM-200 Amp - what is it?
• LightConnect Unveils DGE/OCM
• OCM 500 Amplifiers
• David Belles OCM 500 Soloist Amplifier
• Operating Your Amplifier: Notes And Switching On - MC2 Audio E100 Operating Instructions Manual
• Optical Channel Performance Monitors (OCPM, OCM, OPM) – Thin
• The Top Online Shopping Experience with Lazada Philippines
• OCM 500 power amp - I need a copy of owner's manual...
• Fully-Differential Amplifiers and Benefits When Driving ADCs

WATCH RELATED VIDEO: N4QNT Mercury III S Kit Amplifier Build from KM3KM

OCM-200 Amp - what is it?

Effective date : Year of fee payment : 4. Year of fee payment : 8. A differential amplifier 10 - 1,2 includes an input stage 7 including first M 1 and second M 2 input transistors and first 4 A and second 4 B load devices.

Sources of the first and second input transistors are connected together. Drains of the first and second input transistors are coupled by first 12 and second 13 conductors to the first and second load devices, respectively.

Common mode feedback circuitry 6 A including first M 3 , second M 4 , and third M 5 transistors is combined with offset correction circuitry 8 including the second transistor and the third transistor. Sources of the first, second, and third transistors are coupled to a tail current source Drains of the second and third transistors are coupled to the first and second conductors, respectively.

A common mode voltage V OCM is applied to a gate of the first transistor. Offset trim voltages are applied to gates of the second and third transistors. The present invention relates generally to integrated circuit differential amplifiers having high speed common mode feedback and also having programmable input offset trim capability, and more particularly to improvements which result in substantially reduced circuit complexity and substantially reduced noise levels.

In the prior art, there are several ways to accomplish input offset compensation, for example by trimming or calibrating load devices of the input stage or by injecting an offset compensation current into the circuit nodes between drains of the input transistors and their corresponding load devices.

These input offset compensation techniques require an additional differential input transistor pair and associated tail current source and also require a trim voltage generator circuit, and are characterized by undesirably high noise levels and undesirably high circuit complexity. Current source 3 provides tail current for the common sources or common emitters of the input transistors in block 2.

Block 4 includes load devices e. A common mode feedback circuit 6 is coupled to input stage 7 by means of any one of the circuit paths labeled Path A, Path B, or Path C to adjust corresponding common mode feedback points.

Offset trim circuit 5 is coupled to input stage 7 by either Path D or Path E. The prior art techniques indicated in FIG. Various implementations of the individual blocks in FIG. The common mode feedback using Path A can be used to control tail current source 3 dynamically to adjust the common mode voltage level that occurs on the conductors connected between input transistor pair 2 and load devices 4.

Alternatively, common mode feedback Path B directly adjusts or modulates the impedance of the load circuit in block 4 in order to adjust the common mode voltage level on the conductors connected between the individual load devices in block 4 and the drains or collectors of the input transistors in block 2. Alternatively, common mode feedback Path C can be used to adjust the common mode voltage level on the conductors connected between the individual load devices in block 4 and the corresponding input transistors in block 2 by injecting a common mode feedback current directly into those same conductors.

The output of current mirror 21 flows through an adjustable-resistance or tappable-resistance circuit 17 A,B which is connected between V DD and the output of current mirror Common mode feedback circuit 6 of FIG. Banu, J. Khoury, and Y. This article discloses several known common mode feedback circuits for differential amplifiers.

The prior art differential amplifiers having both high speed common mode feedback and programmable input offset trim capability require undesirably complex circuitry and an undesirably large amount of integrated circuit chip area, and are characterized by undesirably high noise levels associated with the connections of the common mode feedback circuitry and offset trim generators to the amplifier input stage and by undesirably high power consumption. Thus, there is an unmet need in the prior art for a differential amplifier having both high speed common mode feedback and programmable input offset trim capability and which has less complex circuitry than the closest prior art.

There also is an unmet need in the prior art for a differential amplifier having both high speed common mode feedback and programmable input offset trim capability and which has lower noise than the closest prior art. There also is an unmet need in the prior art for a differential amplifier having both high speed common mode feedback and programmable input offset trim capability and which has substantially less complex circuitry and substantially lower noise then the closest prior art.

There also is an unmet need in the prior art for a differential amplifier having both high speed common mode feedback and programmable input offset trim capability and which has lower power dissipation than the closest prior art.

There also is an unmet need in the prior art for a differential amplifier having both high speed common mode feedback and programmable input offset trim capability and which requires less integrated circuit chip area than the closest prior art. It is an object of the invention to provide a differential amplifier having both high speed common mode feedback and programmable input offset trim capability and which has less complex circuitry than the closest prior art.

It is another object of the invention to provide a differential amplifier having both high speed common mode feedback and programmable input offset trim capability and which has lower noise than the closest prior art.

It is another object of the invention to provide a differential amplifier having both high speed common mode feedback and programmable input offset trim capability and which has substantially less complex circuitry and substantially lower noise than the closest prior art.

It is another object of the invention to provide a differential amplifier having both high speed common mode feedback and programmable input offset trim capability and which requires less integrated circuit chip area and which also reduces power consumption, while also providing increased speed and improved noise performance of the differential amplifier. Briefly described, and in accordance with one embodiment, the present invention provides a differential amplifier 10 - 1 , 2 including an input stage 7 having first M 1 and second M 2 input transistors and first 4 A and second 4 B load devices.

First electrodes of the first and second input transistors are connected together. The second electrodes of the first and second input transistors are coupled by first 12 and second 13 conductors to the first and second load devices, respectively.

First electrodes of the first, second, and third transistors are coupled to a tail current source Second electrodes of the second and third transistors are coupled to the first and second conductors, respectively. A common mode voltage V OCM is applied to a control electrode of the first transistor.

Offset trim voltages are applied to the control electrodes of the second and third transistors. In one embodiment, the invention provides a differential amplifier including an input stage 7 having first M 1 and second M 2 input transistors and first 4 A and second 4 B load devices. Each of the first M 1 and second M 2 input transistors includes a control electrode and first and second electrodes.

The first electrodes of the first M 1 and second M 2 input transistors are connected together. The second electrode of the first input transistor M 1 is coupled by a first conductor 12 to a terminal of the first load device 4 A.

The second electrode of the second input transistor M 2 is coupled by a second conductor 13 to a terminal of the second load device 4 B. The first electrodes of the first M 3 and second M 4 transistors are connected together by a third conductor The second electrode of the second transistor M 4 is coupled to the first conductor A common mode output reference voltage V OCM is provided on the control electrode of the first transistor M 3.

The offset correction section 5 A includes an offset generator circuit 5 and the third transistor M 5. A first output 15 of the offset generator circuit 5 is coupled to a control electrode of the third transistor M 5.

A first electrode of the third transistor M 5 is coupled to the third conductor A second electrode of the third transistor M 5 is coupled to the second conductor A second output 19 of the offset generator circuit 5 is coupled to the control electrode of the second transistor M 4. In a described embodiment, a tail current source 3 is coupled between the first electrodes of the first M 1 and second M 2 input transistors and a second reference voltage GND. In a described embodiment, the first M 1 and second M 2 input transistors and the first M 3 , second M 4 and third M 5 transistors are field effect transistors, wherein the control electrodes are gates, the first electrodes are sources, and the second electrodes are drains.

In one embodiment, the input stage 7 is a first stage of the differential amplifier, the differential amplifier further including a second stage 9 including first 29 and second 30 amplifiers, an input of each of the first 29 and second 30 amplifiers being coupled to the first 12 and second 13 conductors, respectively, an output of each of the first 29 and second 30 amplifiers being coupled to the gate of the first transistor M 3 so as to produce the common mode output reference voltage V OCM on the gate of the first transistor M 3.

The outputs of each of the first 29 and second 30 amplifiers are coupled by means of equal resistors 26 , 27 to the gate of the first transistor M 3. In a described embodiment, the offset generator circuit 5 includes a string resistor circuit 17 coupled between a second reference voltage GND and a reference current source 21 and a plurality of switches SW 0 , 1 , 2. The trim voltage selector circuit 32 includes a digital decoder circuit having an input coupled to receive a plurality of bits of a digital trim word TRIM and a plurality of outputs coupled to the outputs 34 of the trim voltage selector circuit In one embodiment, the method includes coupling a second tail current source 3 between the first electrodes of the first M 1 and second M 2 input transistors and a reference voltage GND.

In one embodiment, the method includes coupling a string resistor circuit 17 between the reference voltage GND and a reference current source 21 , coupling a plurality of switches SW 0 , 1 , 2. Referring to FIG. The drain of input transistor M 1 is connected by conductor 12 to one terminal of load resistor 4 A, and the drain of input transistor M 2 is connected by conductor 13 to one terminal of load resistor 4 B.

Combined CMFB and offset adjustment circuit 8 includes an input offset adjustment section 5 A and a common mode feedback section 6 A. Conductor 12 is connected to the drain of N-channel transistor M 4 , which is included in both offset adjustment section 5 A and common mode feedback section 6 A.

Conductor 13 is connected to the drain of N-channel transistor M 5 which is included in both offset adjustment section 5 A and common mode feedback section 6 A. Common mode feedback section 6 A includes a P-channel transistor M 3 , the source of which is connected by conductor 14 to a tail current source 11 and the sources of transistors M 4 and M 5.

The gate of transistor M 3 is coupled to an output common mode voltage V OCM , which is a reference voltage that is provided for amplifier 10 - 1. Offset trim voltage generator circuit 5 is coupled between reference voltage V REF and ground. Combining the two functions of input offset correction and common mode feedback into a single functional circuit in accordance with the present invention results in use of fewer noise-generating circuit elements, and the result has been found to be an almost negligible level of noise generation.

Combining the two functions of input offset correction and common mode feedback into a single functional circuit in accordance with the present invention also results in reduced power consumption, reduced circuit complexity, and reduced amounts of required integrated circuit chip area.

The differential amplifier of the present invention may include only a single stage as shown in above described FIG. The sources of input transistors M 1 and M 2 are connected to tail current source 3.

The drain of input transistor M 1 is connected by conductor 12 to one terminal of a current source 4 A, and the drain of input transistor M 2 is connected by conductor 13 to one terminal of current source 4 B.

The lower terminals of current sources 4 A and 4 B are connected to ground, so they function as load devices for input transistors M 1 and M 2 , respectively. Note that a non-inverting single stage amplifier usually does not have much gain. The simplest topology for implementing a high-gain amplifier therefore usually is an inverting amplifier stage. A common mode output voltage V OCM is produced on conductor This average voltage is the common mode voltage V OCM.

Amplifiers 29 and 30 and resistors 26 and 27 form a second stage 9 of two-stage differential amplifier 10 - 2. In FIG. Offset adjustment section 5 A includes transistors M 4 and M 5 and offset trim generator 5. Conductor 12 is connected to the drain of P-channel transistor M 4 , which functions as a part of both offset adjustment section 5 A and common mode feedback section 6 B. Similarly, conductor 13 is connected to the drain of P-channel transistor M 5 , which functions as a part of offset adjustment section 5 A and common mode feedback section 6 B.

Common mode feedback section 6 B in FIG. The upper terminal of tail current source 11 is connected to V DD. The gate of transistor M 3 is coupled to the output common mode voltage V OCM generated by amplifiers 29 and 30 and resistors 26 and Offset trim voltage generator circuit 5 is coupled to receive a reference voltage V REF and to receive a four-bit digital input offset adjustment word TRIM on digital bus The output current I REF of current mirror 21 flows into the upper terminal of a resistor string 17 which is composed of a DC offset resistor 17 - 0 of resistance R DC and series-connected unit resistors 17 - 1 , 2.

N, each having a resistance Ru. In this example, N is equal to 16, which is the number of switch control conductors 34 generated at the output of a trim decoder circuit 32 that decodes the 16 states of 4 -bit digital trim word TRIM on bus Switch control circuit 32 can be implemented by means of various conventional decoders.

The various tap points 37 - 0 , 1 , 2. A selected tap point of resistor string 17 is selectively coupled by one of the switches SW 0 , 1 , 2.

LightConnect Unveils DGE/OCM

Wei Xu, Garret T. Bonnema, Kirk W. Gossage, Norman H. Wade, June Medford, Jennifer K. Optical coherence microscopy OCM is an interferometric method for acquiring high-resolution, depth-resolved, en face images. In this article we demonstrate a fiber-based OCM system with analog fringe generation and signal demodulation. A high power operational amplifier drives a mirrored piezoelectric stack mounted in the reference arm of the interferometer causing a displacement equal to 0.

OCM 500 Amplifiers

A flat optical power spectrum is essential for optical telecommunication signals. One solution is to flatten out the powers across the transmission window by attenuating higher power channels relative to the lower power channels. This is more generally referred to as gain flattening. This Application Note describes how a WaveShaper, combined with an optical spectrum analyser OSA or optical channel monitor OCM can be used to create a robust automated gain flattening system that adapts on-the-fly to changes in the optical power spectrum. The system is not only applicable to EDFA, but any other optical amplifier or broadband source e. Raman amplifiers or supercontinuum lasers. Automated Gain Flattening in an Optical Amplifier.

David Belles OCM 500 Soloist Amplifier

Prices incl. Ready for shipment delivery time approx. To use Spring Air with full benefits, we recommend you to activate Javascript in your browser. To category Audio Devices.

Operating Your Amplifier: Notes And Switching On - MC2 Audio E100 Operating Instructions Manual

Don't ask me what I mean by "good sound". I'm just curious about the OCM and if anyone has heard one or read about it. View CA Fx: I just heard about this amp yesterday while visiting my local dealer. They're not an official outlet for OCM yet, but had the amp on hand for audition.

Optical Channel Performance Monitors (OCPM, OCM, OPM) – Thin

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The Top Online Shopping Experience with Lazada Philippines

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OCM 500 power amp - I need a copy of owner's manual...

Fully differential amplifiers FDAs are versatile tools to use in a signal chain, and they offer a variety of benefits. Fully differential signal processing provided by FDAs gives the circuit designer increased immunity to external noise, two times the dynamic range, and reduced even-order harmonics over traditional amplifiers with single-ended outputs. Two popular application uses for differential amplifiers that we will discuss today are: driving differential signal chains, and enabling single-ended to differential conversion in place of transformers. This is different than in a traditional operational amplifier op amp with a single-ended output, where the output common-mode voltage and the single-ended output are inherently the same signal.

Fully-Differential Amplifiers and Benefits When Driving ADCs

This article reviews the basics of fully-differential amplifiers FDA , important specifications and what they mean, and how to interface to the signal chain using an FDA for balun-type functionality with additional performance. These ADCs are used in a wide variety of applications ranging from, but not limited to, communications wireless infrastructure and backhaul to test and measurement oscilloscopes and spectrum analyzers. To support this input architecture, engineers must design the signal chain to interface to the ADC differentially. It is easy to assume that one must use a balun in the signal chain for best performance, despite coupling issues in some applications. This is not always the case, however, especially in test and measurements where the DC component is needed.

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