7.2 Typical Application

The OPAx132 family offers outstanding dc precision and ac performance. These devices operate up to 36V

supply rails and offer ultra-low input bias current and input bias current noise, as well as 8MHz bandwidth and

high capacitive load drive. These features make the OPAx132 a robust, high-performance operational amplifier

for high-voltage industrial applications with high source impedance.

+

–

OPAx132

Input

Output

2.94k

1nF

39nF

590

499

Figure 7-1. OPA132 2nd Order 30kHz, Low Pass Filter Schematic

7.2.1 Design Requirements

Use the following parameters for this application:

• Gain = 5V/V

• Low-pass cutoff frequency = 30kHz

• –40db/dec filter response

• Maintain less than 3dB gain peaking in the gain versus frequency response

7.2.2 Detailed Design Procedure

WEBENCH® Circuit Designer creates customized power supply and active filter circuits based on your system

requirements. The environment gives you end-to-end selection, design, and simulation capabilities that save you

time during all phases of the analog design process.

Use our tools to help with your designs:

• Filter design tool

• Powerstage designer

• WEBENCH® Power designer

• PCB thermal calculator

7.2.3 Application Curve

Frequency (Hz)

-60

-40

-20

0

20

100

1k

10k

100k

1M

Figure 7-2. OPA132 2nd-Order 30kHz, Low-Pass Filter Response

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OPA132, OPA2132, OPA4132

SBOS054C – JANUARY 1995 – REVISED AUGUST 2024

Copyright © 2024 Texas Instruments Incorporated

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Product Folder Links: OPA132 OPA2132 OPA4132