serhannn
Member level 4
I need to desing a simple common source amplifier with only one resistor (Rd) and using a Vdd of at most 3.3 V. Moreover, I need to obtain 10 gain. I'm trying to amplify a 10 mV signal at 1 MHz freq. As a load a 50 fF capacitor is connected.
I tried various Vdd and resistance values, but I can't seem to get a gain larger than 5-6. My signal has a 1 V DC bias. What should be the appropriate solution here to get a gain of 10. This is like a first design in Cadence, I'm using a transistor called nmos4 and I have no idea about its W/L values and thus I can't do any calculations to find Id, gm and the gain. So, I just tried out some resistor values and changed my Vdd ranging up to 3.3 V, but still I'm not sure how the gain is affected. I know the basic theory behind the CS amplifier but can't apply it in this case. Any suggestions or tips?
Thanks..
I tried various Vdd and resistance values, but I can't seem to get a gain larger than 5-6. My signal has a 1 V DC bias. What should be the appropriate solution here to get a gain of 10. This is like a first design in Cadence, I'm using a transistor called nmos4 and I have no idea about its W/L values and thus I can't do any calculations to find Id, gm and the gain. So, I just tried out some resistor values and changed my Vdd ranging up to 3.3 V, but still I'm not sure how the gain is affected. I know the basic theory behind the CS amplifier but can't apply it in this case. Any suggestions or tips?
Thanks..