ANALYSIS OF LTSPICE SIMULATION FILES WITH .MEASURE STATEMENTS
CONCLUSION
Motivation
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Simulation of rc low pass filter in ltspice
OPEN LT SPICE
Design a rc low pass filter
Provide value for R ,c and Voltage source
Simuate with .op,.tran,.DC,and .Ac
Corner frequency was found 32hz.
Simulation of 4-bit ideal ADC DAC
Download the ADC and DAC circuit
Provide the source
Disable ramp by using X
Disable one source at once by using X
Doing FFT in 3rd fig. we found that output signal is very noisy
In 4th fig. we see that all the values are evenly distributed and step size is fixed.
INL,DNL & FFT ANALYSIS OF ADC DAC
LTSPICE INL, DNL FFT Analysis
In 1st fig. we disable sine source and enable ramp then we use java script to do filtering
Since we have ideal DAC ADC so we get ideal curve
In 3rd fig. we have the extracted value
In histogram test we need more time steps so we take 5.12E-6 steps.
In 5th fig. we have odd number of cycles and inl and dnl of sine
Simulation of ADC DAC with 4-bit R2R circuit
LTSPICE INL, DNL FFT Analysis
In fig.1 we analyze real R2R circuit using sine wave.
In 2nd fig. we did fft analysis of sine function with ramp calibration.
In 4th fig. we see error in ramp test.
In 5th fig.we analyze signal to noise ratio.
In 6th fig.we see jump in INL and DNL.
Analysis of LTSPICE simulation files with .measure statement
ADC DAC test simulation in LTSPICE with ramp
.meas trans OUT00 FIND V(vout)AT=81.92us
After simulation view spice error log will show the result
After simulation "FILE" , "EXECUTE .MEAS script" generates the result
CONCLUSION
HERE WE BUILD LTSPICE CIRCUIT WITH IDEAL ADC CONNECTED TO IDEAL DAC .AND WE SIMULATE IT FOR RAMP AND SINE SIGNAL.AND bWE ALSO CHECK INL DNL FFT AND SIGNAL TO NOISE RATIO.AT THE END WE ALSO SIMULATE ADC DAC CIRCUIT WITH R2R CIRCUT AND DID THE ANALYSIS.
