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cqmyg5
Joined: 21 Oct 2003
Posts: 137
Helped: 1
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 26 Jul 2004 9:49 "How to simulate output resistance in Hspice" |
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Dear All,
I'm confused with this problem for long time. could anyone give me a instruction?
Thanks!
Last edited by cqmyg5 on 27 Jul 2004 5:55; edited 1 time in total |
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mazelk
Joined: 23 Apr 2004
Posts: 107
Helped: 2
Location: COLOMBIA
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| 26 Jul 2004 17:10 Re: "How to simulate ouput resistance in Hspice" |
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Hi....
You can use .tf command in order to get output resistance, input resistance, voltage gain, etc...
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bastos4321
Joined: 01 Jan 1970
Posts: 334
Helped: 24
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| 26 Jul 2004 23:40 Re: "How to simulate ouput resistance in Hspice" |
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You can use the definition of output resistance. Just connect an AC voltage source to the output and measure the current. The output resistance is given by ohms law V/I.
I use this approach to find output resistance of complex blocks.
bastos
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cqmyg5
Joined: 21 Oct 2003
Posts: 137
Helped: 1
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| 27 Jul 2004 5:45 Re: "How to simulate ouput resistance in Hspice" |
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to bastos4321:
Does this AC source have DC voltage? as:
A: vx vout gnd ac=1mv
B: vx vout gnd dc=1.5v ac=1mv
use A or B?
Thanks!
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stanlangley
Joined: 16 Mar 2004
Posts: 19
Helped: 1
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| 27 Jul 2004 8:15 "How to simulate output resistance in Hspice" |
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Should we connect the input to ground before conduct the simulation to calculate the output resistance?
Stan
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andy2049
Joined: 26 May 2004
Posts: 32
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| 28 Jul 2004 13:27 Re: "How to simulate output resistance in Hspice" |
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| I think you need to connect the input to ground accroding to the definition.
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