how can i test the noise of amplifier?

[wonbef]

Hi, all:

how can i test the noise of amplifier? can you provide the materials/methods of test of amplifiers? need your help! Thx!


regards

 

[Vamsi Mocherla]

To find the input referred noise in an amplifier, Keep it in unity gain configuration. Then inject a noise(ac) source and run a noise analysis accompanied by an ac analysis. Then plot the INOISE component. The following is the deck for noise analysis in HSPICE

.NOISE Statement — AC Noise Analysis
Syntax
.NOISE ovv srcnam inter
where:
refpwr Reference power level used in computing the
distortion products. If omitted, a value of 1mW,
measured in decibels magnitude (dbM), is
assumed. The value must be ³ 1e-10.
spwf Amplitude of the second frequency F2. The value
must be ³ 1e-3. Default = 1.0.

ovv Nodal voltage output variable defining the node at
which the noise is summed

srcnam Name of the independent voltage or current source
to be used as the noise input reference
inter Interval at which a noise analysis summary is to be
printed, inter specifies a number of frequency points
summary in the AC sweep. If inter is omitted or set
to zero, no summary printout is made. If inter is
equal to or greater than one, a summary printout is
made for the first frequency, and once for each inter
frequency increment thereafter.


I hope that this helps.............

 

[wonbef]

thank you very much!

 

[jake]

refpwr Reference power level used in computing the
distortion products. If omitted, a value of 1mW,
measured in decibels magnitude (dbM), is
assumed. The value must be ³ 1e-10.
spwf Amplitude of the second frequency F2. The value
must be ³ 1e-3. Default = 1.0.

i can't understand this, what's mean ?

 

[flamingo]

refpwr Reference power level used in computing the
distortion products. If omitted, a value of 1mW,
measured in decibels magnitude (dbM), is
assumed. The value must be ³ 1e-10.
spwf Amplitude of the second frequency F2. The value
must be ³ 1e-3. Default = 1.0.

i can't understand this, what's mean ?

content mentioned above I think is used in .Disto simulation, also together with the .AC analysis. f1 and f2 are used as two tone input signal to measue the IM3 IM2 distortion etc.

 

[xz781122]

yes pspice can do it