A timing circuit is required that feeds into an OP AMP's noninverting terminal (i.e., draws no current). The circuit's output response \(v_{\mathrm{O}}(t)\) must be
\[
v_{\mathrm{O}}(t)=5\left(1-e^{-1000 t}ight) u(t) \mathrm{V}
\]

Figure P7=35 shows two commercial products and the vendors claim each will meet the requirement. Which will you select and why?

5V 5V t = 0 f= Vendor A t=0 1 Vendor B 1 F 1 1 + Va(1) Unit cost: $7.00 Vo(1) Unit cost: $4.50