Instrumentation Amplifier

The circuit in Figure 5 performs the same function as that in Figure 4 but with the high input

impedance.

Figure 5. Instrumentation Amplifier

Low Pass Active Filter

The low pass filter shown in Figure 6 has a DC gain of (-R2 / R1) and the –3dB corner frequency is

1/2πR2C. Make sure the filter is within the bandwidth of the amplifier. The Large values of feedback

resistors can couple with parasitic capacitance and cause undesired effects such as ringing or

oscillation in high-speed amplifiers. Keep resistors value as low as possible and consistent with

output loading consideration.

Figure 6. Low Pass Active Filter

TYPICAL APPLICATION CIRCUITS(Con.)

FC358F

2019. 11. 15

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