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Two stage differential amplifier

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 am trying to design an op-amp with a high-pass feedback. The diagram is shown below. The high pass feedback has a corner frequency at 1Hz.


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Design of Two-Stage Differential Amplifier with Stacked Transistors for Biomedical Applications


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 am trying to design an op-amp with a high-pass feedback.

The diagram is shown below. The high pass feedback has a corner frequency at 1Hz. Based on the books that I have been reading and the number of designs I have found online, the procedure that is generally used involves taking the compensation capacitor into account from the get go.

My question is, how would a high-pass filter in the negative feedback path affect the choice of compensation capacitance needed? In all the designs I've seen, the compensation capacitance was taken to be 0. Should the addition of a high pass filter affect this calculation and if so, how? I would naturally just mirror this current to the branch containing M2 and M4. The second branch should consume the highest amount of current.

This makes things very hard because it would implying that M1 and M2 and also M3 and M4 are no longer of the same sizes. This seems to imply that something is quite wrong.

I wouldn't mind some assistance if possible. The capacitor across the feedback resistor adds a zero in the loop. That is to say that it increases loop gain but it also adds phase, improving stability. This capacitor also adds a pole at a higher frequency which has the potential to cancel out the stability improvement of the zero.

So the capacitor value must be carefully chosen so that the loop gain gets down to unity before this higher frequency pole is reached. The compensation capacitor's value would be chosen to give the desired phase margin, usually for unity closed loop gain, but maybe for a higher closed loop gain for a decompensated op amp irrespective of how the external circuit is configured. The designer then has the option of including a capacitor across the feedback resistor to further improve stability if desired.

This capacitor is sometimes included for the dual purpose of reducing high frequency noise. You can vary the current in both the input and output stages together by varying Ibias. To vary the current in just the input stage insert and vary a resistor between the source of M5 and Vdd. The current in either side of the input stage should be kept balanced equal or distortion will result.

At a simple level of thinking, slewrate is set by the current in the input stage or the current in the output stage, which ever is smaller. This is because it is these currents which charge the compensation capacitor. For example, if there is 20uA total in the input stage and 35uA in the output stage then the slewrate equals assuming a pF Ccomp Open loop gain is determined by the transconductance, Gm of the input stage and the impedance of the compensation capacitor at any particular frequency.

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Two stage op-amp design with compensation ideas Ask Question. Asked 1 year, 9 months ago. Active 26 days ago. Viewed times. The op-amp itself is two stage as can be seen below. Leonhard Euler Leonhard Euler 5 5 bronze badges. Would be really helpful for me. Add a comment. Active Oldest Votes.

EDIT That op amp design could do with an output stage on it:. James James 4, 1 1 gold badge 5 5 silver badges 13 13 bronze badges.

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block to two-stages operational Amplifier current is constant i.e. Bandwidth, Two-stage Amplifiers have been used. Constant.

Optimization and Simulation of Two Stage Operational Amplifier


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Differential amplifier

two stage differential amplifier

A differential amplifier is a type of electronic amplifier that amplifies the difference between two input voltages but suppresses any voltage common to the two inputs. Single amplifiers are usually implemented by either adding the appropriate feedback resistors to a standard op-amp , or with a dedicated integrated circuit containing internal feedback resistors. It is also a common sub-component of larger integrated circuits handling analog signals. In practice, however, the gain is not quite equal for the two inputs. A more realistic expression for the output of a differential amplifier thus includes a second term:.

Show all documents The main aim of the work is to obtain high gain and high CMRR.

two-stage operational amplifier


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Optimization and Simulation of Two Stage Operational Amplifier Using 180nm and 250nm Technology

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The two-stage, fully differential audio amplifier with μm CMOS technology and TSMC process is proposed. Telescopic amplifier created stage one and.

Master Thesis - Two-stage Operational Amplifier Analog Generator in 28 nm TSMC Technology

Skip to Main Content. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. Use of this web site signifies your agreement to the terms and conditions. A High Speed Two Stage Operational Amplifier with High CMRR Abstract: A differential amplifier is actually a electronic amplifier which amplifies the difference between two input voltages and suppresses any voltage common to the two inputs.

Download PDF. Abstract: Low Power Dissipation is an emerging challenge in the current electronics industry. Area shrinking has found the most prominent place and is the foundation of every constricted size in the utilization of CMOS circuits in Integrated Circuit Manufacturing. Functionality in terms of rapidity, dissipation of power, etc.

In this master thesis a new design methodology will be used to design a two-stage operational amplifier OpAmp analog generator in 28nm TSMC technology.

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Today, digital circuit cores provide the main circuit implementation approach for integrated circuit IC functions in very-large-scale integration VLSI circuits and systems. Typical functions include sensor signal input, data storage, digital signal processing DSP operations, system control and communications. Despite the fact that a large portion of the circuitry may be developed and implemented using digital logic techniques, there is still a need for high performance analogue circuits such as amplifiers and filters that provide signal conditioning functionality prior to sampling into the digital domain using an analogue-to-digital converter ADC for analogue sensor signals. The demands on the design require a multitude of requirements to be taken into account.




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  1. Macbride

    This is a common convention

  2. Mezile

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  3. Mabon

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  4. Tygobei

    What an interesting question