Apr 22, 2004 #1 L lunren Member level 4 Joined Jun 19, 2003 Messages 71 Helped 3 Reputation 6 Reaction score 2 Trophy points 1,288 Activity points 661 simulation parameters of opa Hi everybody: I want to simulate the THD(harmonic distortion) and equivalent input noise of a opa, but how can I do it? thank you for your help.
simulation parameters of opa Hi everybody: I want to simulate the THD(harmonic distortion) and equivalent input noise of a opa, but how can I do it? thank you for your help.
Apr 22, 2004 #2 F flyinspace Full Member level 2 Joined Jul 1, 2003 Messages 123 Helped 1 Reputation 2 Reaction score 2 Trophy points 1,298 Activity points 1,160 What's your simulator? If it is Hspice, noise analysis can get the equivalent input noise. I am not familiar with the harmonic distortion. I want to know too.
What's your simulator? If it is Hspice, noise analysis can get the equivalent input noise. I am not familiar with the harmonic distortion. I want to know too.
Apr 22, 2004 #3 L lunren Member level 4 Joined Jun 19, 2003 Messages 71 Helped 3 Reputation 6 Reaction score 2 Trophy points 1,288 Activity points 661 to flyinspace: But how to simulate the equivalent input noise in Hspice using noise analysis, hope you can give me some hint. thank you
to flyinspace: But how to simulate the equivalent input noise in Hspice using noise analysis, hope you can give me some hint. thank you
Apr 22, 2004 #4 H Humungus Full Member level 6 Joined Jul 10, 2001 Messages 383 Helped 41 Reputation 82 Reaction score 15 Trophy points 1,298 Activity points 3,985 got to the manual and look after noise analysis. Normally you have to specify an output node and a noise summing node (in general your input) In some simumlators noise analysis is performed with the .AC statement
got to the manual and look after noise analysis. Normally you have to specify an output node and a noise summing node (in general your input) In some simumlators noise analysis is performed with the .AC statement
Apr 22, 2004 #5 H Hughes Advanced Member level 3 Joined Jun 10, 2003 Messages 715 Helped 113 Reputation 226 Reaction score 26 Trophy points 1,298 Activity points 5,984 Re: to flyinspace: lunren said: But how to simulate the equivalent input noise in Hspice using noise analysis, hope you can give me some hint. thank you Click to expand... Here is a example: * Noise simulation netlist .include 'opamp.sp' XDUS IN+ IN- OUT VDD VSS OPAMP VDD VDD 0 5.0 VSS VSS 0 0.0 VIN- IN- 0 2.5 VIN+ IN+ 0 2.5 AC 1.0 0 .AC DEC 10 1 1G .NOISE V(OUT) VIN+ 10 .PRINT INOISE ONOISE .END Inoise and onoise will be printed at the end of hspice output file. Inoise is the input equivalent noise.
Re: to flyinspace: lunren said: But how to simulate the equivalent input noise in Hspice using noise analysis, hope you can give me some hint. thank you Click to expand... Here is a example: * Noise simulation netlist .include 'opamp.sp' XDUS IN+ IN- OUT VDD VSS OPAMP VDD VDD 0 5.0 VSS VSS 0 0.0 VIN- IN- 0 2.5 VIN+ IN+ 0 2.5 AC 1.0 0 .AC DEC 10 1 1G .NOISE V(OUT) VIN+ 10 .PRINT INOISE ONOISE .END Inoise and onoise will be printed at the end of hspice output file. Inoise is the input equivalent noise.
Apr 23, 2004 #6 J joskin Member level 1 Joined Mar 26, 2004 Messages 38 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,286 Activity points 329 As to analysis of distortion,you can run the FFT analysis and check the amplitude of the harmonics.