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Troubleshooting Techniques Troubleshooting Op-Amps • Make sure power supply voltages are normal and it is good idea to measure voltages (and signals) directly on the IC Pins • A simple test can be used to identify that an op-amp is at least working. Figure below shown how the test is done. Simply short the input temporarily to V+ and then to V-, the output voltage should swing from near V- to near V+. If it fails, you can be fairly certain the IC is bad. • Verify the op-amp dc output offset voltage. If the op-amp uses a dual supply, the offset voltage few mill volts. • Faults in the Noninverting Amplifier • Faults in the Inverting Amplifier 1. Open Feedback Resistor (Rf) 1. Open Feedback Resistor(Rf) If Rf open, the signal will still amplified by the high open-loop gain. If Rf open, op-amp operate at very high open-loop gain. Result: Output signal clipped Result: Output signal clipped 2. Open Input Resistor(Ri) 2. Open Input Resistor(Ri) If Ri open, no input signal to op-amp If Ri open (i.e. infinite), the closed-loop gain become 1 Result: No output signal Results: Output signal = Input signal (Amplifier acts as voltage-follower) Open Rf Ri No Output Signal Vin