Demystifying Switched Capacitor Circuits

Demystifying Switched-Capacitor Circuits

24

output impedance of the main single-stage amplifi er, thereby increasing the overall

gain without signifi cantly affecting the original op-amp’s speed [3][5].

Appendix 2.1

Use the MATLAB program to analyze the pole-splitting phenomenon and RHP zero

cancellation of a standard differential-input, single-ended-output, two-stage op-amp.

For the pole-splitting analysis, use R

c

= 0 and sweep C

c

from 0 to 30 pF. For RHP

zero cancellation, use C

c

= 10 pF and sweep R

c

from 0 to 300 Ω. It is assumed that

the input transconductance capacitor g

m

= 0.01, the fi rst-stage output impedance R

1

=

100 kΩ, the second-stag