Hello all,
I'm just beginning my formation as analog microelectronics designer. I've just finished my first relevant IC project: An integrated CMOS Instrumentation Amplifier for biomedical applications (now in fabrication). There are some postlayout simulated specifications for the designed prototype:
Differential gain: 25 or 50 V/V (fixed)
CMRR: 100dB
Differential voltage input range: 80uV to 7mV (rms)
Bandwidth: 2MHz
Noise referred to input (for BW=2MHz): 16uV (rms)
Now I'm trying to write the test plan for the circuit. The test PCB and the tests to do on the circuit include measuring gain, CMRR, PSRR, BW, noise, THD, slew rate, etc. are in planning process, but my problem is about the equipment required to perform this tests (waveform generator, signal and noise measurement), since typical function generators and oscilloscopes are not fit to this purpose, due to the tiny amplitude of the voltage input range and noise. One can think that input signals can be generated by a typical function generator followed by a resistive divider, but this may be not a good idea due to the thermal noise contribution of resistors, which would "bury" the input signal into noise.
So, if any of you can share your knowledge about the test and measurement equipment suited for this tests (brands and references) I will be very grateful. I have no experience with special testing equipment, so the internet research I've made so far left me quite confused...
Thank you for your help!
I'm just beginning my formation as analog microelectronics designer. I've just finished my first relevant IC project: An integrated CMOS Instrumentation Amplifier for biomedical applications (now in fabrication). There are some postlayout simulated specifications for the designed prototype:
Differential gain: 25 or 50 V/V (fixed)
CMRR: 100dB
Differential voltage input range: 80uV to 7mV (rms)
Bandwidth: 2MHz
Noise referred to input (for BW=2MHz): 16uV (rms)
Now I'm trying to write the test plan for the circuit. The test PCB and the tests to do on the circuit include measuring gain, CMRR, PSRR, BW, noise, THD, slew rate, etc. are in planning process, but my problem is about the equipment required to perform this tests (waveform generator, signal and noise measurement), since typical function generators and oscilloscopes are not fit to this purpose, due to the tiny amplitude of the voltage input range and noise. One can think that input signals can be generated by a typical function generator followed by a resistive divider, but this may be not a good idea due to the thermal noise contribution of resistors, which would "bury" the input signal into noise.
So, if any of you can share your knowledge about the test and measurement equipment suited for this tests (brands and references) I will be very grateful. I have no experience with special testing equipment, so the internet research I've made so far left me quite confused...
Thank you for your help!