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CMOS common-gate amplifier
The CMOS common-gate amplifier:
(a) circuit;
(b) small-signal
equivalent circuit; and (c) simplified version of the circuit in (b).
D. De Venuto,
Politecnico di Bari
0
The source follower
The source follower: (a) circuit; (b) small-signal equivalent circuit;
and (c) simplified version of the equivalent circuit.
D. De Venuto,
Politecnico di Bari
1
NMOS amplifier with an active load
(a) NMOS amplifier with enhancement
determination of the transfer characteristic;
D. De Venuto,
Politecnico di Bari
load;
(b)
graphical
2
NMOS amplifier with an active load (2)
(c) transfer characteristic.
D. De Venuto,
Politecnico di Bari
3
NMOS amplifier with a depletion load
The NMOS amplifier with depletion load: (a) circuit; (b) graphical
construction to determine the transfer characteristic; and (c) transfer
characteristic.
D. De Venuto,
Politecnico di Bari
4
Small-signal equivalent circuit
Small-signal equivalent circuit of
incorporating the body effect of Q2.
D. De Venuto,
Politecnico di Bari
the
depletion-load
amplifier,
5
The CMOS inverter
(a) The CMOS inverter. (b) Simplified circuit schematic for the inverter.
D. De Venuto,
Politecnico di Bari
6
Operation of 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.
D. De Venuto,
Politecnico di Bari
7
Operation of the CMOS inverter (2)
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.
D. De Venuto,
Politecnico di Bari
8
Voltage transfer characteristic
The voltage transfer characteristic of the CMOS inverter.
D. De Venuto,
Politecnico di Bari
9
Dynamic operation
Dynamic operation of a capacitively loaded CMOS inverter: (a) circuit;
(b) input and output waveforms;
D. De Venuto,
Politecnico di Bari
10
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.
D. De Venuto,
Politecnico di Bari
11
CMOS transmission gate
The CMOS transmission gate.
D. De Venuto,
Politecnico di Bari
12
Transmission gate (2)
Equivalent circuits for visualizing the operation of the transmission gate
in the closed (on) position: (a) vA is positive; (b) vA is negative.
D. De Venuto,
Politecnico di Bari
13
High frequency equivalent model
(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).
D. De Venuto,
Politecnico di Bari
14
Short circuit current gain
Determining the short-circuit current gain Io/Ii.
D. De Venuto,
Politecnico di Bari
15