Chapter 11, Problem 11.52P

Consider the bridge circuit and diff-amp described in Problem 11.27 . The BJT diff-amp is to be replaced with a MOSFET diff-amp as shown in Figure 11.19 . The transistor parameters are $V_{TN}=0.4\text{V},K_n=1\text{mA}/{\text{V}}^2$ and $\lambda =0.$ The bias voltages of the MOSFET diff-amp are $V^{+}=5\text{V}$ and $V^{-}=-5\text{V},$ and the reference current is $I_Q=0.2\text{mA}.$ Let $R_D=20\text{k}\Omega$ . Terminal A of the bridge circuit is to be connected to the gate of $M_1$ and terminal B is to be connected to the gate of $M_2$ . (a) Determine the range of output voltage $v_O$ as $\delta$ changes. (b) Explain the advantages and disadvantages of this circuit configuration compared to that in Problem 11.27 .