The circuit below is known as a bridge amplifier. 10 ΚΩ w w 20 ΚΩ www 10 ΚΩ ww 30 ΚΩ a) Assuming ideal op amps, derive an expression for the voltage gain vo/vs. b) if v,(t) = 3sin(wt), sketch v₁(t), v2(t) and vo(t) to scale versus time. c) If the op amps are supplied from ±15V, and clip at ±13V, what is the peak value of vo(t) just at the threshold of clipping? (This circuit can be useful if a peak output voltage greater than the magnitude of the supply voltage is required.)