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Unformatted text preview: the small signal output impedance of the transistors). From your small signal model, write down the nodal equations and thus derive an expression for the small signal voltage gain.  Figure 4 5. A BICMOS Darlington configuration is shown in Figure 5. The bias voltage on the gate of M1, V B , is adjusted to set the DC output voltage to 2V with V DD = 5V. Calculate the bias currents in both devices  and then calculate the small signal voltage gain for the circuit. Assume a value of 0.77V for V BE . You may ignore the body effect for the MOS transistor or include it for a bonus of 5 marks. The MOS transistor parameters are: μ e C ox = 60 μ A.V-2 , ± = 0.5V 1/2 , 2 | ² F | = 0.7, ³ = 0, W/L = 40/1 and V T0 = 0.8V. For the bipolar transistor: I o = 10-16 A, ´ = 100 and V A = µ .  Figure 5 TJC 11/2/07 R1 R2 R3 R4 R5 RL Vin + – rs C1 M1 M3 M2 C2 Vout +-Vdd Vin + – 1k ± M1 Q2 1k ± Vout B V V DD...
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- Spring '08
- small signal, Signal Voltage Gain, small signal voltage, RL Vout