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https://designers-guide.org/forum/YaBB.pl Analog Verification >> Analog Performance Verification >> Transfer Gain from the supply/ground to oscillator output https://designers-guide.org/forum/YaBB.pl?num=1355190732 Message started by andriclt on Dec 10th, 2012, 5:52pm |
Title: Transfer Gain from the supply/ground to oscillator output Post by andriclt on Dec 10th, 2012, 5:52pm I am trying to setup a bench to check the transfer gain from VDD, GND and Substrate to Oscillator output. My oscillator is a PMOS cross coupled LC Osc. Here is what I do: Test1: PSS+PXF PSS form: PSS Analysis: Shooting Beat frequency = 4G Output frequency = 10 Oscillator node positive = osc_out Oscillator node negative = gnd! PXF form: Sweeptype = relative harmonic =1 Start=1K, Stop=1M MaxSidebands =10 Oscillator node positive = osc_out Oscillator node negative = gnd! Test2: PSS+PAC On schematic: PAC=1 is set on the vdc source connecting the node (VDD/ GND/ Sub). PSS form: Same as above PAC form: Sweeptype = relative harmonic =1 Start=1K, Stop=1M MaxSidebands =10 I am trying to find how the noise from the low frequency gets mixed upto the oscillating frequency. For PXF simulation output: should I check the voltage gain of sideband given by 1K-1M or 4G+1K to 4G+1M? For PAC simulation output: Why does Voltage gain have input and output sidebands while voltage only has output sideband? Should I check the voltage for sideband given by 1K-1M or 4G+1K to 4G+1M? I want to make sure that both PXF and PAC are giving identical results (accuracy issues ignored) and that I am actually plotting the frequencies of interest. Always been confused. I have read the 'Introductionto RF simulations and its application' and still couldn't get the spectre usage of it. |
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