Thanks a lot..........
How to plot the gain plot of OTA in CADENCE spectre? is it frequency Vs. ratio of output current to input voltage? please help me......
After taking dB20 and phase(degree) of this plot can i get gain, phase, pahse margin and gain margin?
please help me i want to find these parameters....
Thanks in advance
yes, add input signal to design in testbench view as Vcm and diff signal on top of it, ( simply connect vdiff to pos input of ota with mag of 1, and vcvs with gain of -1 to neg input,) and then run your ac simulation. Ofcourse instead of selecting Vout as in amp u should select Iout .
from the resulting plots (ac simulation result ) u get what u need
sir, i cant understand.... i have done it but still i get negative dB response..........
I have attached OTA design please guide me...... i really need it....
Thanks in advance...
Hi
I have a similar inquiry wherein I have a CMOS OTA and I have to plot its THD in Cadence Spectre.
I have done parametric analysis in several frequency steps and then when I went to calculator and filled in all 4 parameters and clicked THD in special functions it simply gave me a scalar value.
But I want to plot THD graph with 5 tones plus fundamental while calculator takes only one frequency at a time.
Is there any other method of calculating THD without using calculator?