2-Stage Operational Transconductance Amplifier -Bias...

Electronic Circuits 2 (17/1) W.-Y. Choi / H.-K. Kim

Lect. 18: Design Project

2-Stage Operational Transconductance Amplifier

- Bias

- Differential Amplifier

- Cascode Amplifier



• Differential Amplifier

Parameter Value

Av > 20 dB

BW > 120 MHz

CMRR > 60 dB

ICMR > 1.4 V

Power < 1.25 mW



Set DC to 0Vdc

Set ACMAG to 1 (Important!)

• Differential input pair setting



• Differential input pair setting

Part name : E



• Output Plot

DC Gain > 20 dB

3dB Bandwidth > 120 MHz



• Gain measurement



• BW measuement

-3dB

Your Bandwidth

Click Toggle cursor



• CMRR

CMRR = |Adm/Acm|

But our gains are dB scale,

CMRR (dB) = Adm (dB) – Acm (dB)

< Common Mode Gain >



• ICMR

Gain < 20dB



• Cascode Amplifier

Parameter Value

Av > 34 dB

BW > 250 kHz

Output Impedance > 30kΩ

Power < 1.25 mW



• Output Plot

DC Gain > 34 dB

3dB Bandwidth > 250 kHz



• Output Impedance



• Differentiation

DC Gain > 34 dB


1) Click Add Trace

3) Choose signal what you want to differentiate

2) Select D( )

example

Then, your plot is differentiated by x-axis’ variable what you have sweeped.



DC Gain > 34 dB


• 2 – Stage OTA

Parameter Value

Av > 76 dB

BW > 25 kHz

Phase Margin > 75 o

CMRR > 75 dB

ICMR > 0.4 V

Power < 2.5 mW



DC Gain > 34 dB


PM > 75o

-180o

Gain = 0dB

• Phase margin measurement



DC Gain > 34 dB

Deadline: 2:00 PM on May. 4, 2017

2-Stage Operational Transconductance Amplifier -Bias...

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