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ECET 2310. Lecture Twenty-Three. Calculation of Noise Gain (Section 3.5). To Calculate the Noise Gain Disconnect all external sources and replace with their internal impedances

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ecet 2310

ECET 2310

Lecture Twenty-Three

calculation of noise gain section 3 5
Calculation of Noise Gain (Section 3.5)
  • To Calculate the Noise Gain
    • Disconnect all external sources and replace with their internal impedances
    • Treat the circuit as a noninverting amp circuit and calculate the gain from the noninverting terminal to the output. This resulting voltage gain is the noise gain.
offset voltages and currents section 3 6
Offset Voltages and Currents (Section 3.6)
  • There are two effects to be considered
    • Input Offset Voltage (from dc balance at the two inputs)
    • Input Bias Current (currents required for proper dc biasing of internal components)
offset voltages and currents section 3 62
Offset Voltages and Currents (Section 3.6)
  • Values of sources in model are:
    • Vio = Input Offset Voltage
    • Ib+ = Input Bias Current at noninverting terminal
    • Ib- = Input Bias Current at inverting terminal
offset example
Offset Example
  • For the circuit below, VIO = 1 mV, IB = 80 nA and IIO = 20 nA