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You can either use PSS or a simple transient sim. Simply sweep the input voltage and check the average current going through the input capacitors. Then you can obtain the input impedance.
What are the target specs of your voltage reference? From your schematics, it seems that the bias currents are not well defined, and your circuit operates in subthreshold. Is low voltage operation a requirement? If not, I suggest you use a much simpler structure to generate the required...
What is the goal/target specs of your circuit? Do you need both current and voltage DACs?
You can realize a voltage-to-current converter by forcing your Vbg on a resistor (using feedback). This can be implemented with a simple amplifier and a pass transistor. On the other hand, bandgaps always...
Since the Q of the BPF seems quite large, I would increase the number of points in the AC sim to check if its center frequency is exactly at 1GHz. It should also help use conservative accuracy for the transient analysis. You can also play with the strobeperiod to increase the accuracy. At the...
As you said, GBW=UGB. If you have an OTA in unity gain, its UGB will be equal to the GBW. For single pole response and a closed-loop gain below the OTA DC gain, the GBW = (CL-gain x f-3dB) will be constant. These terms are usually differentiated because, in practical cases, you might not have a...
You want to meet certain DC gain and GBW specifications, larger or equal than, less or equal than, etc. So why bother if your gain is higher?
The logic here is that you know GBW and DC gain of an OTA are linked. If you don't like having a higher gain when increasing the GBW, reduce the output...
Often, chopper amplifiers are used to sense signals from DC up to a few kHz (low pass characteristic). An example is chopped instrumentation amplifiers. DC servo loops are used to cancel differential signals from DC up to a certain frequency (which of course includes offset).
Therefore...
I don't understand your first point. That would be true if you increase only the DC gain (with a fixed GBW). If you are talking about an OTA, increasing its current consumption, i.e., increasing its Gm, would lead to an increase in both DC gain and GBW. If that's not the case, it should be...
You are probably not showing the resistors in series with the output stage miller capacitors (we can only guess). Cadence schematics are more helpful in this case. The whole freq. response will be important for the settling behavior, so if you want a single pole settling, you should have about...
Show your schematics.
The flat region you mentioned is an LHP zero. You can see that by the increase in phase (and gain). If this is a two-stage miller compensated amplifier, it means that your zero is before the second pole. As you mentioned, this will affect your amplifier's settling behavior.
Then try to create the pin again. On "Update Components and Nets" go to "I/O Pins" and on "Pin Labels" mark "Create Labels As-> Text Display". Click on Options and mark Layer Name and Layer purpose "same as pin".
Hope it works.
I would suggest first getting the actual gm and id (or ids) values and calculate the gmoverid to see if it matches with the variable you are getting. I'm not familiar with such PDK, but I would also try and run the same testbench with another PDK (preferably a real one) to check if the funny...
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