A CMOS amplifier stage is shown in Fig. 7.49. Select W/L for M₁and M₅to give V_i= V_O= 2.5V dc and |I_D| = 100 µA bias in all devices. The minimum value of L and W is 2 µm. Calculate the small-signal, low-frequency gain and the ˆ’3-dB frequency of the stage. Verify with SPICE. Use device data from Problem 7.37(a) with |λ| = 0.03 V^ˆ’1, μ_pC_ox= 30 µA/V², and V_tp= ˆ’0.7 V.

Data from Prob. 7.37:

A wideband MOS amplifier stage is shown in Fig. 7.48. Calculate the small-signal, low-frequency gain and use the zero-value time constant method to estimate the ˆ’3-dB bandwidth. Use μ_nC_ox = 60 µA/V², t_ox = 20 nm, C_ol = 0.3 fF/(µm of gate width), ψ_o = 0.6 V, V_t = 0.7 V, γ = 0.4 V^1/2, λ = 0, and V_O = 2.5 V dc. For C_db and C_sb, use C_db0 = C_sb0 =0.8 fF/(µm of gate width).

Fig. 7.49:

VDp = 5 V 100 100 M4 M3 M5 M1 M2 100 M7 M5 100 100 2