Consider the bipolar op-amp circuit in Figure P13.70. Design the circuit such that the differential gain is at least 800 , and the output voltage is zero when the input voltages are zero. The transistor current gains are 120 for all transistors, and the base-emitter voltages are \(0.6 \mathrm{~V}\), where appropriate.

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RREF Qc QA QB Figure P13.70 R V+= 15 V ww QD Ry Q4 V=-15 V R3 est Rs Rs