and r
b
, for example, if the input impedance r
s
is 1 kW, and each of the
two resistors is 100 kW, then the resistors load down the signal
source with 200 kΩ (100 kΩ + 100 kW), resulting in a –0.5% gain
error. The following gives a simplified representation of the circuit
and calculating process.
