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How do you calculate phase margin in cadence?
phase margin in cadence calculator Run AC analysis, View waveform of gain and phase then measure phase at 0dB gain this will give you the phase margin.
What is the difference between phase margin and gain margin?
Gain margin is defined as the amount of change in open-loop gain needed to make a closed-loop system unstable. The phase margin is the difference in phase between −180° and the phase at the gain cross-over frequency that gives a gain of 0 dB.
What is the significance of gain margin and phase margin?
Phase margin indicates relative stability, the tendency to oscillate during its damped response to an input change such as a step function. Gain margin indicates absolute stability and the degree to which the system will oscillate, without limit, given any disturbance.
How do you increase gain and phase margin?
You can increase the phase margin by making a dominant pole nearer to the zero frequency origin. This is accomplished by compensating the op amp through adding a shunting capacitor in the highest impedance node of the amplifier. This is a very well known technique which is used commonly to increase the phase margin.
What is STB analysis in cadence?
The Spectre STB analysis provides a way to simulate continuous time loop gain, phase margin and gain margin without breaking the feedback loop. In the stability analysis you are required to choose a probe from which the loop gain measurements are taken. A setting of CMDM = 1 selects the common-mode gain. …
What is LSTB analysis?
The .LSTB analysis is used in single mode to calculate phase, gain margins and frequency characterisrics. A cx# file is written which contains gain as a function of frequency. phase_margin(deg)= -8.1393e+001.
When does phase margin do not exist in STB?
Phase margin does not exist if the loop gain magnitude does not go below 0 dB, gain margin does not exist if the loop gain phase does not go below 0 degrees (due to the slightly unusual definition of loop gain phase in the stb analysis, see http://www.designers-guide.org/Forum/YaBB.pl?num=1124688329 ). Thank you both for the comments!
How to output gain, bandwidth, and phase margin?
As the title implied, using Graphic-based ADE tool as well as ocean script, result can be easily found. But what if I want to use Spectre language, how to achieve this (Screen display or save into a file an simulation result (gain,bandwidth).).
How to output gain, bandwidth, phase margin using Spectre language?
As the title implied, using Graphic-based ADE tool as well as ocean script, result can be easily found. But what if I want to use Spectre language, how to achieve this (Screen display or save into a file an simulation result (gain,bandwidth).). I already have the formula copied from calculator in ADE.