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Recent content by andover

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    One Question about FB in Razavi's Design of Analog CMOS

    Thanks LvW, For the forward factor F, by letting output voltage 0, how do you get the - sign? By the way, can you show me how to calculate the input impedance of this kind of circuit using FB technique? Thanks again The "general feedback equation" is supplemented by an additional forward...
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    One Question about FB in Razavi's Design of Analog CMOS

    Hi, When I was reading razavi's book about feedback, I got a question about the attached circuit. (chapter 8 Fig8.3, 8.6). From KCL, It's straight forward to get Vout/Vin=-C1/C2, and it's not hard to get Y/X=A/(1+BA)=1/B * (1-1/BA) as a general equation for feedback. However, when he applies...
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    Question about output impedance of output amplifier

    Thank you guys for the answers. and I don't quite understand why do we model the amplifier as voltage source (thevenin) not current (norton)? any explanations? Thanks again
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    Question about output impedance of output amplifier

    Hi, I got one question about the requirement of having small output impedance of the output amplifier to drive a low load resistor. I understand if we simply model the output amplifier as a voltage source in series with the output impedance(thevenin), so that most of the voltage signal is on the...
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    Question about class AB opamp

    To make myself clear, I believe in small signal analysis, it assumes the input signal should be small enough around Q point, so that linear relationship between input and output voltage exists. However, the input of AB opamp could be rail to rail, which violates the presumption for the small...
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    Question about class AB opamp

    class-ab op-amp Hi guys, I have a question about two transistor class AB opmap. For small signal analysis, it is linear around Q point so that vout=vin*gain. However, for Class AB opamp, the input ranges from rail to rail, and due to square law, Id is proportional to (vin-vth)^2, which...
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