Adding noise to a sine source

[Ajay]

Hi,
I have a schematic which has a sine wave as an input. I want to add
noise to a sine source to do some analysis. I saw the "noise/freq
pair" field in the "Properties" of the sine wave. However adding that
does not help. Has anybody used this feature. If yes please could you
let me know how to use it.

Thanks in Anticipation

Cheers !!
Ajay

 

[Partha]

Ajay,
Consider the use of port component in analogLib library. It supports
all source types pwl, pulse, sine dc and exponent. It also has an
intrinsic noise source that allows noise analysis to directkly compute
the noise figure of a circuit

Partha


nagarkarajay@yahoo.com (Ajay) wrote in message news:<d4e5f6ab.0311160815.36499083@posting.google.com>...

Hi,
I have a schematic which has a sine wave as an input. I want to add
noise to a sine source to do some analysis. I saw the "noise/freq
pair" field in the "Properties" of the sine wave. However adding that
does not help. Has anybody used this feature. If yes please could you
let me know how to use it.

Thanks in Anticipation

Cheers !!
Ajay

 

[Andrew Beckett]

Ajay,

My guess is that you're not doing a noise analysis - one of noise, sp, pnoise,
psp, qpnoise or qpsp. spectre supports small signal noise analyses.
I suspect that you think it will show up in the transient analysis - it won't.

But Partha's point is good - using a port component is good for this; again,
the noise will only appear in one of the above analyses.

There has been discussion in the past on this group (check google)
on transient noise and the merits (or lack of) thereof.

Regards,

Andrew.

On 16 Nov 2003 20:49:48 -0800, cadeguy@yahoo.com (Partha) wrote:

Ajay,
Consider the use of port component in analogLib library. It supports
all source types pwl, pulse, sine dc and exponent. It also has an
intrinsic noise source that allows noise analysis to directkly compute
the noise figure of a circuit

Partha


nagarkarajay@yahoo.com (Ajay) wrote in message news:<d4e5f6ab.0311160815.36499083@posting.google.com>...
Hi,
I have a schematic which has a sine wave as an input. I want to add
noise to a sine source to do some analysis. I saw the "noise/freq
pair" field in the "Properties" of the sine wave. However adding that
does not help. Has anybody used this feature. If yes please could you
let me know how to use it.

Thanks in Anticipation

Cheers !!
Ajay

--
Andrew Beckett
Senior Technical Leader
Custom IC Solutions
Cadence Design Systems Ltd