bhargava834
Junior Member level 1
how to improve on an op amp
i have designed a fully differential op amp. Op amp is designed with telescopic gain boosting topology.
It is designed for 1.8V single supply in 0.18um technology.
which is having ICMR of 0.48V (0.65V-1.13V), and UGB of 1.06GHz, DC gain of 116dB, PM of 61degrees.
When i adjusted the Input Common mode voltage to 0.8V, and given a sine input of 4uV P-P at 10Hz, I got output of 746mV. It shows that the gain is of 105.5dB. Where as according to ac characteristics the gain at 10 Hz is 116dB.
What could be the reason for this?? and how to improve the swing ??
Plz help me.
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Thanks & Regards
Bhargav Reddy
i have designed a fully differential op amp. Op amp is designed with telescopic gain boosting topology.
It is designed for 1.8V single supply in 0.18um technology.
which is having ICMR of 0.48V (0.65V-1.13V), and UGB of 1.06GHz, DC gain of 116dB, PM of 61degrees.
When i adjusted the Input Common mode voltage to 0.8V, and given a sine input of 4uV P-P at 10Hz, I got output of 746mV. It shows that the gain is of 105.5dB. Where as according to ac characteristics the gain at 10 Hz is 116dB.
What could be the reason for this?? and how to improve the swing ??
Plz help me.
---
Thanks & Regards
Bhargav Reddy