d. de venuto,politecnico di bari 0 the cmos common-gate amplifier: (a) circuit; (b) small-signal...

D. De Venuto, Politecnico di Bari1

The CMOS common-gate amplifier: (a) circuit; (b) small-signal equivalent circuit; and (c) simplified version of the circuit in (b).

CMOS common-gate amplifier


The source follower: (a) circuit; (b) small-signal equivalent circuit; and (c) simplified version of the equivalent circuit.

The source follower


(a) NMOS amplifier with enhancement load; (b) graphical determination of the transfer characteristic;

NMOS amplifier with an active load


NMOS amplifier with an active load (2)

(c) transfer characteristic.


The NMOS amplifier with depletion load: (a) circuit; (b) graphical construction to determine the transfer characteristic; and (c) transfer characteristic.

NMOS amplifier with a depletion load


Small-signal equivalent circuit of the depletion-load amplifier, incorporating the body effect of Q2.

Small-signal equivalent circuit


(a) The CMOS inverter. (b) Simplified circuit schematic for the inverter.

The CMOS inverter


Operation of the CMOS inverter when v1 is high: (a) circuit with v1 = VDD (logic-1 level, or VOH); (b) graphical construction to determine the operating point; and (c) equivalent circuit.

Operation of the CMOS inverter


Operation of the CMOS inverter when v1 is low: (a) circuit with v1 = 0V (logic-0 level, or VOL); (b) graphical construction to determine the operating point; and (c) equivalent circuit.

Operation of the CMOS inverter (2)


The voltage transfer characteristic of the CMOS inverter.

Voltage transfer characteristic


Dynamic operation of a capacitively loaded CMOS inverter: (a) circuit; (b) input and output waveforms;

Dynamic operation


Dynamic operation (2)

(c) trajectory of the operating point as the input goes high

and C discharges through the QN;

(d) equivalent circuit during the capacitor discharge.


The CMOS transmission gate.

CMOS transmission gate


Equivalent circuits for visualizing the operation of the transmission gate in the closed (on) position: (a) vA is positive; (b) vA is negative.

Transmission gate (2)


(a) High-frequency equivalent circuit model for the MOSFET; (b) the equivalent circuit for the case the source is connected to the substrate (body); (c) the equivalent circuit model of (b) with Cdb neglected (to simplify analysis).

High frequency equivalent model


Determining the short-circuit current gain Io/Ii.

Short circuit current gain

d. de venuto,politecnico di bari 0 the cmos common-gate amplifier: (a) circuit; (b) small-signal...

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c equivalent circuit

equivalent circuit model

circuit b input

b simplified circuit

qn d equivalent circuit

equivalent circuits

c transfer characteristic

mosfet b