Dec 5, 2005 #1 shaq Full Member level 5 Joined Jul 23, 2005 Messages 311 Helped 14 Reputation 28 Reaction score 4 Trophy points 1,298 Activity points 3,397 Hi... Can anyone tell me if I hope the ID of M0 is 22µA, how to calculate the value of the bias voltage(Vb3) to meet my specification ? And, help me to determine the (W/L) of M1&M2. Thank you for your help!!!! P.S. The source of M0 connected to VDD=3v. -----Spec.--------------------------------- DC Gain (A0) >75dB Unity Gain BAndwidth >40MHz Input Common-Mode Range : 0.5~2.5v ---------------------------------------------
Hi... Can anyone tell me if I hope the ID of M0 is 22µA, how to calculate the value of the bias voltage(Vb3) to meet my specification ? And, help me to determine the (W/L) of M1&M2. Thank you for your help!!!! P.S. The source of M0 connected to VDD=3v. -----Spec.--------------------------------- DC Gain (A0) >75dB Unity Gain BAndwidth >40MHz Input Common-Mode Range : 0.5~2.5v ---------------------------------------------
Dec 5, 2005 #2 V vbhupendra Full Member level 4 Joined May 11, 2005 Messages 235 Helped 15 Reputation 30 Reaction score 10 Trophy points 1,298 Location GOA, INDIA Activity points 3,219 Vb3= VDD - sqrt[(2*ID)/(kW/L)] + Vthp
Dec 5, 2005 #3 shaq Full Member level 5 Joined Jul 23, 2005 Messages 311 Helped 14 Reputation 28 Reaction score 4 Trophy points 1,298 Activity points 3,397 vbhupendra said: Vb3= VDD - sqrt[(2*ID)/(kW/L)] + Vthp Click to expand... Dear vbhupendra, But my max. common-mode voltage is 2.5v. If I use your formula to get the Vb3=1.37v, the M0 is in linear region. I think the reason of M0 in linear region is relation to M1(or M2). oh..my... Could someone give a hand?
vbhupendra said: Vb3= VDD - sqrt[(2*ID)/(kW/L)] + Vthp Click to expand... Dear vbhupendra, But my max. common-mode voltage is 2.5v. If I use your formula to get the Vb3=1.37v, the M0 is in linear region. I think the reason of M0 in linear region is relation to M1(or M2). oh..my... Could someone give a hand?
Dec 5, 2005 #4 V vbhupendra Full Member level 4 Joined May 11, 2005 Messages 235 Helped 15 Reputation 30 Reaction score 10 Trophy points 1,298 Location GOA, INDIA Activity points 3,219 use Vimax = VDD - VDS0 - VGS1 Vimax = VDD - sqrt[(2*ID0)/(kW0/L0)] - sqrt[(ID0)/(kW1/L1)]