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What architecture would you recommend me for using? a simple differential pair with a CLASS AB output stage?
when you say that the bandwidth of the buffer should be larger than 4MHz, you are referring to the complete buffer (I mean the gain stage with the output stage) or only to the output...
I have a problem with the common voltage for a sigma delta ADC. The sample frequency is 4MHz, but this common voltage presents many glitches. What would be your recommendation for designing the buffer that I need for this common voltage reference? what architecture should I use? the buffer...
I am simulating a chopper amplifier using PNOISE and PSS. There is a weird result in my simulations. The output noise of the first stage of the amplifier is LOWER than the input noise. My amplifier is working very well in AC simulations. I do not understand why this is happening. My chopper...
I designed a bandgap reference source. I will put an output capacitor for improving the noise specification, but the bandgap reference output presents oscilations in the transient simulations. It is the most simple bandgap reference source, this does not use an OPAMP. How could I improve the...
When you use PNP transistors in a CMOS process, you are not going to have problems with the BETA. But, when you use the widlar source using NPN transistors, you are going to have problems with the BETA, because the collector current is not equal in spite of the mirror: part of the current goes...
Thank you aryajur. Yes, I am using that resistor divider for being able to supply the OTA with a voltage lower than 1V without requiring low-threshold MOSFETs. I know the problem with the offset and with the OTA-input noise, but is a trade-off with the low-supply voltage.
And, yes, I'm using...
Thank you aryajur. This is the circuit that i'm designing, where do you suggest to break the loop?. I broke the loop in the positive input of the OTA and put there the AC signal, and i measured the AC output voltage in the resistor Rb. Is that right?
thanks in advance.
I want to measure the phase margin of a bandgap reference source, but I do not know how to do it. I measure the phase margin in the negative loop? or in the positive loop? or in the two loops at the same time???.
This source has two feedback loops, negative loop and positive loop. I know that...
The negative loop gain is higher than the positive loop gain. Now, I have a question:
Where do I measure the phase margin?? in the positive loop? or in the negative loop?? or in the two loops at the same time?? if anybody knew, pleas say to me how to measure the phase margin.
thanks in advance.
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