How to simulate SC filter with hspice ?

[jyq_analog]

I want get the frequency responce,IM of filter not through idea Z-domain simulation or R emulation.
Any books or chapters exists?

 

[qslazio]

maybe you should read R j Baker's "cmos mixed signal design" ,there are a lot of hspice example which is easy to learn

 

[Johnson]

I heard that HSPICE has simulation problem with SC filters!

 

[ynhe]

Hi
These paper will help you modeling a SC filter using HSPICE.
C. F. Kurth and G. S. Moschytz, “Nodal analysis of switched-capacitor networks,” IEEE Trans. Circuits Syst., vol. CAS-26, pp. 93-104,Feb. 1979

C. F. Kurth and G. S. Moschytz, “Two-port analysis of switched-capacrtor networks using four-port equivalent circuits in the z-domain,” IEEE Trans. Circuits Syst., vol. CAS-26, pp. !66- 180, Mar. 1979

M. S. Ghausi and K. R. Laker, “Modern Filter Design – Active RC and Switched Capacitor”,Prentice-Hall, Inc., USA, 1981.

BERT D. NELIN, “Analysis of switched-capacitor networks using general-purpose circuit simulation programs, ” IEEE Trans. Circuits Syst., vol. CAS-30, pp. 43-48, Jan. 1983


ynhe

 

[CDRCDR]

Try use cadence instead

 

[bastos4321]

To simulate SC filters why you do not use the old switcap program.

To get the frequency response is the best I know.

Bastos

 

[jyq_analog]

I read the paper A. Baschirrotto R. Castello"A 1-v 1.8MHZ CMOS Switched-opamp SC filter with rail-to-rail output swing".JSSC.DEC.1997.
I want to know how to get Fig.10 with hspice.Is it a ideal figure or real figure?

 

[zmliu]

Get frequency response by performing FFT on the transient response in Hspice.
I suggest you'd better use SpectreRF to simulate SC circuits.

 

[jyq_analog]

To zmliu
Thanks.I havn't Spectre.
Through the input of sin signal,the THD and IM can easily get through FFT .But how can I get the frequency responce of SC filter ?

 

[bastos4321]

To zmliu
Thanks.I havn't Spectre.
Through the input of sin signal,the THD and IM can easily get through FFT .But how can I get the frequency responce of SC filter ?

With Hspice, you can get the frequency response by doing and FFT of the transient response. Do a transient run and them an FFT.

Bastos

 

[jyq_analog]

to Bastos
What is the input signal to get the frequency responce?
Can you give me more advices?For example,input siganl,IC .

 

[xxf_86]

I think you mat put a pulse signal input,and then do the circuit trans,last make FFT.

 

[layes2]

use spectureRF
there is a guide line in cic
tell you how to simulate SC in specture

 

[bastos4321]

to Bastos
What is the input signal to get the frequency responce?
Can you give me more advices?For example,input siganl,IC .

To get the frequency response from the transient, you have to put a dirac pulse at the input. Just use a sort pulse at the input and them let the filter generate the response to this dirac. The FFT of the transient response is the frequency response.

You can use a pulse with 1V and PW of 1-10ns ?? depends on you clock frequency. I would use one clock cycle.

Bastos

 

[bear7679]

You can see P.E. Allen's book.

 

[xwcwc1234]

Hi bastos4321,
How to decide the FFT start and stop time in Hspice ? Could you provide a Hspice simulation file for example ?

 

[bitcat]

use spectureRF
there is a guide line in cic
tell you how to simulate SC in specture

where to download this guide?thanks!

 

[mists]

see this https://www.designers-guide.org/Analysis/sc-filters.pdf

 

[beckchm]

which tool is best for simulate SC filter

 

[mists]

spectre-rf i think