For I = 100 uA, determine the transconductance Gm, the output impedance Rout, and the open- circuit voltage gain Avo. of the BiCMOS cascode amplifier in Figure Q2. The transistor parameters are: For BJT, VA = 50 V and B = 100; For the MOSFET, VA = 5 V, unCox = 200 uA/V^2, and W/L = 25.
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For I = 100 uA, determine the transconductance Gm, the output impedance Rout, and the open- circuit voltage gain Avo. of the BiCMOS cascode amplifier in Figure Q2. The transistor parameters are: For BJT, VA = 50 V and B = 100; For the MOSFET, VA = 5 V, unCox = 200 uA/V^2, and W/L = 25.
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![Consider a BJT differential amplifier biased with a Widlar current source, as shown in Figure 4. The transistor parameters are: β = 200, VBE(ON) = 0.7 V (except for Q3 and Q4), VA = ∞ for Q1 and Q2, and VA = 100 V for Q3 and Q4. Reverse saturation current, Is for transistor Q3 and Q4 is given as 1×10−15 A. From analysis, it is determined that I1 = 0.5 mA, la = 400 μA, v1 = v2 = 0 V, VCE2 = 2.7 V and CMRR (dB) = 80 dB Figure 4 a) Calculate the value of resistors R1, R2 and RC. b) Find the amplifier's differential-mode voltage gain (Ad), common-mode voltage gain (ACM) and common-mode output resistance ( Ricm ). [Ricm ≈ (1+β)Rocs where Rocs is the output resistance of the current source ] c) Draw the pnp version for the differential amplifier of Figure 4. Clearly label all resistors and currents.](https://www.doubtrix.com/uploads/editor/6551442834FjRRsYNstK.jpg)
