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Voltage controlled amplifier op amp gain

Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. I have a car seat motor that I am driving via PWM and am aiming to measure its position by counting the minor variations in voltage across a current sensing resistor attached to the low side of a FET as the motor rotates.


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Voltage controlled amplifier op amp gain

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WATCH RELATED VIDEO: Voltage Controlled Amplifier(VCA)

Variable gain amplifiers


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Introduction to Operational Amplifiers with LTSpice

Classification based on the manufacturing process used Op-amps can be divided into two types according to the manufacturing process used: CMOS and bipolar. In contrast, bipolar processes withstand higher voltage than CMOS processes. The main cause of this noise is the crystalline disorder of silicon, which exists in abundance on the wafer surface. Therefore, CMOS op-amps are used for most applications nowadays. Classification based on the power supply type There are two types of op-amps: single power supply type and dual power supply type. Even single-supply op-amps can be used with dual power supplies as long as the difference between the minimum and maximum supply voltages does not exceed the differential input voltage range shown in the Absolute Maximum Ratings table. In this case, care should be exercised as to power supply noise since each power supply in the op-amp is not referenced to GND.

One issue is that the filters to get rid of the PWM may be attenuating the signal you want to measure, so I would suggest a notch filter to.

DIY Voltage Controlled Amplifier


There are several possible ways they can be made, but most are not linear. This applies either to the voltage control itself, or the distortion created by simple circuits or both. It may be possible to match individual units to get a usable result, but mostly it's close to impossible. There are many different ways to make a VCA, but most are unsuitable for DIY construction because they require tightly matched components. The IC versions are particularly hard - rumour has it that people have made Blackmer VCA blocks with discrete parts, but I've not seen one published anywhere. BJTs bipolar junction transistors work surprisingly well, provided the input level is kept 'reasonable' which in this context means no more than mV RMS. I opted to use a simple resistive load instead, not just to reduce the parts cost, but to make the circuit simpler.

What Is a Voltage-Controlled Amplifier?

voltage controlled amplifier op amp gain

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Current-to-voltage converter — In electronics, a transimpedance amplifier is an amplifier that converts current to voltage. Its input ideally has zero impedance, and the input signal is a current.

Wideband Voltage Controlled Amplifier (Rev. A


A CORP. Effective date : Year of fee payment : 4. Year of fee payment : 8. Year of fee payment : An improved multiplier circuit of the type including an input operational amplifier and a gain cell is disclosed.

Introduction to Operational Amplifiers with LTSpice

For complaints, use another form. Study lib. Upload document Create flashcards. Flashcards Collections. Documents Last activity. Add to Add to collection s Add to saved. It provides linear-dB gain control with high impedance inputs.

A variable-gain or voltage-controlled amplifier is an electronic amplifier that varies its gain depending on a control voltage (often abbreviated CV).

US4434380A - Compensation for VCA OP amp errors - Google Patents

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Feedback Amplifier Design


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A variable-gain or voltage-controlled amplifier is an electronic amplifier that varies its gain depending on a control voltage often abbreviated CV. VCAs have many applications, including audio level compression , synthesizers and amplitude modulation.

A voltage buffer , also known as a voltage follower , or a unity gain amplifier , is an amplifier with a gain of 1. Op-Amp Voltage Buffer. We mentioned in the Ideal Op-Amp section that the op-amp will change its output voltage until the two inputs are the same. In this case, we can slow down time and imagine what happens if we take a steady-state situation and then suddenly change the input voltage:. From the ideal op-amp modeled as a VCVS , our buffer circuit looks like this:. The voltage-controlled voltage source gives us one additional equation:. In a truly ideal op-amp, with infinite gain and bandwidth and slew rate, the process described in the intuitive model happens instantaneously.

On 4qd. There are magnetoresistors. You can also use almost any semiconductor.




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  1. Felding

    Just enough, I will participate.

  2. Iov

    No talking!