mr_chip
Member level 3
I have recently seen in one publication a low-power SD ADC design with a single stage telescopic cascode OTA with gain enchancement. The spec for the OTA is:
Technology: 0.18u CMOS
Power supply: ≤1V
DC gain: 80 dB
Bandwidth with 2pF load: 8.5 MHz
However I highly doubt if it possible to realize telescopic OTA in 0.18u with 1V supply.. I expect that the Vt in 0.18u is something around 400 mV for normal transistor, they are saying about using weak inversion and I do not know the required output voltage swing, but still I can't understand how it will work. Perhaps low-Vt transistors can help, but nothing is written about it.
Does anyone has ideas about it?
Technology: 0.18u CMOS
Power supply: ≤1V
DC gain: 80 dB
Bandwidth with 2pF load: 8.5 MHz
However I highly doubt if it possible to realize telescopic OTA in 0.18u with 1V supply.. I expect that the Vt in 0.18u is something around 400 mV for normal transistor, they are saying about using weak inversion and I do not know the required output voltage swing, but still I can't understand how it will work. Perhaps low-Vt transistors can help, but nothing is written about it.
Does anyone has ideas about it?