Problem The differential amplifier below with a mismatch of ΔRD/RD = 2% must achieve a CMRR of 60 dB and a differential gain of 5 at a bias current ID3 = 1 mA. Assuming RD ≪ ro1, find the minimum value of λ for Q3. (μnCox = 200 μA/V2 and (W/L)1 = 28).
10.91. The differential pair of Fig. 10.99 must achieve a CMRR of 60 dB ( = 1000). Assume a power budget of 2 mW, a nominal differential voltage gain of 5, and neglecting channel-length modulation in M1 and M2, compute the minimum required λ for M3. Assume (W/L)1,2 = 10/0.18, μnCox = 100 μA/V2, VDD = 1.8 V, and ΔR/R = 2%. Figure 10.99