When v id = 0, two drain currents are equal to I/2.
Linear segment.
Linearity can be increased by increasing overdrive voltage(see next slide).
Price paid is a reduction in gain(current I is kept constant).
12.
Large-Signal Operation The linear range of operation of the MOS differential pair can be extended by operating the transistor at a higher value of V OV .
13.
Small-Signal Operation of MOS Differential Pair
Enlarge the linear segment by including equal resistance R e in series with the emitters.
36.
Large-Signal Operation The transfer characteristics of the BJT differential pair (a) can be linearized by including resistances in the emitters.
37.
Small Signal Operation The currents and voltages in the differential amplifier when a small differential input signal v id is applied.
38.
Small Signal Operation A simple technique for determining the signal currents in a differential amplifier excited by a differential voltage signal v id ; dc quantities are not shown.
This equivalence applies only for differential input signals.
Either of the two common-emitter amplifiers can be used to find the differential gain, differential input resistance, frequency response, and so on, of the differential amplifier.
Half circuit is biased at I/2.
The voltage gain(with the output taken differentially) is equal to the voltage of half circuit.
81.
Multistage Amplifier Equivalent circuit for calculating the gain of the input stage of the example. Input differential resistance Gain of first stage
82.
Multistage Amplifier Equivalent circuit for calculating the gain of the second stage of the example. Gain of second stage
83.
Multistage Amplifier Equivalent circuit for calculating the gain of the third stage of the example. Gain of third stage
84.
Multistage Amplifier Equivalent circuit for calculating the gain of the output stage of the example. Gain of output stage Output resistance
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