OPA192 datasheet(29/51 Pages) TI

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9.2.1.2 Detailed Design Procedure

The infinite-gain multiple-feedback circuit for a low-pass network function is shown in Figure 9-1. Use Equation 1

to calculate the voltage transfer function.

1 3

1 R R C C

Output

Input

s C

1 R

1 R R C C

(1)

This circuit produces a signal inversion. For this circuit, the gain at dc and the low-pass cutoff frequency are

calculated by Equation 2:

Gain

1 R R C C

(2)

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9.2.1.3 Application Curve

Frequency (Hz)

-60

-40

-20

100

10k

100k

Figure 9-2. OPAx189 Second-Order, 25-kHz, Chebyshev, Low-Pass Filter

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OPA189, OPA2189, OPA4189

SBOS830G – SEPTEMBER 2017 – REVISED APRIL 2021

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OPA192 Datasheet(PDF) 29 Page - Texas Instruments