Quad Operational Amplifier Instrumentation Amplifier
3-10 Example Circuits
3.8 Quad Operational Amplifier Instrumentation Amplifier
Figure 3–7 shows area 300 equipped with a quad operational amplifier
configured as a quad-operational-amplifier instrumentation amplifier using a
dual power supply.
Basic setup is done by choice of input and feedback resistors. The transfer
function for the circuit as shown is:
VOUT VINB VINA R303 2(R302)
R303 R325
R309
Where: R302 = R318, R309 = R316, and R325 = R329
AVR303 2(R302)
R303 R325
R309 101 as shown
To cancel the effects of offset errors, adjust Vadj (D304+) by applying an extra
signal.