Analog Integrated Circuit Design

2nd edition


Problem 3.16

1. small-signal gain of the amplifier

1-1. Schematic

1-2. HSPICE Netlist

* Problem 3.16 for gain

 

* MOS model

.include p18_cmos_models_tt.inc

 

* main circuit

mn1 3 4 5 0 nmos L=0.18u W=10u

mp2 3 2 1 1 pmos L=0.18u W=10u

mp3 2 2 1 1 pmos L=0.18u W=10u

 

* current source

id3 2 0 dc 100u

 

* voltage source

Vdd 1 0 dc 1.8

Vbias 4 0 dc 1

Vin 5 0 dc 431m ac 1

** vin dc value adjusted to ensure mn1 is in active mode

 

* analysis

.op

.ac dec 10 1k 100G

 

* options

.options post

.end

 

1-3. Simulation Result

AV= 25dB = 19V/V

2. input resistance of the amplifier

2-1. Schematic

2-2. HSPICE Netlist

* Problem 3.16 for rin

 

* MOS model

.include p18_cmos_models_tt.inc

 

* main circuit

mn1 3 4 5 0 nmos L=0.18u W=10u

mp2 3 2 1 1 pmos L=0.18u W=10u

mp3 2 2 1 1 pmos L=0.18u W=10u

 

* current source

id1 5 0 dc 100u ac 1

id3 2 0 dc 100u

 

* voltage source

Vdd 1 0 dc 1.8

Vbias 4 0 dc 1

 

* analysis

.op

.ac dec 10 1k 100G

 

* options

.options post

.end

2-3. Simulation Result

rin = 1.42kΩ



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