$5\mathrm{.}27$ Design the difference$-$amplifier circuit in Fig. P$5\mathrm{.}27$

DESIGN

PROBLEM

PSPICE

MULTISIM

so that $v_o=10(v_b-v_a),$ and the voltage source $v_b$ sees an input resistance of $220k.$ Specify the values of $R_a,R_b,$ and $R_f$ using single resistors or combinations of resistors from Appendix H$.$ Use the ideal model for the op amp.

Figure P$5\mathrm{.}27$