Distortion

Rejection

Circuitry*

(3, 5)

(+)

(2, 6)

(–)

(8)

V+

(1, 7)

(4)

V–

Output

Stage*

* Patents Granted:

#5053718, 5019789

OPA2604

SBOS006A – SEPTEMBER 2000 – REVISED DECEMBER 2015

www.ti.com

7 Detailed Description

7.1 Overview

The OPA2604 is a dual, FET-input operational amplifier designed for enhanced AC performance. Low distortion,

low noise, and wide bandwidth provide superior performance in high quality audio and other applications

requiring dynamic performance.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Distortion

The distortion produced by the OPA2604 is below the measurement limit of virtually all commercially available

equipment. A special test circuit, however, can extend the measurement capabilities.

Op amp distortion can be considered an internal error source, which can be referred to the input. Figure 22

shows a circuit that causes the op amp distortion to be 101 times more than normally produced. The addition of

circuit. The closed-loop gain is unchanged, but the feedback available for error correction is reduced by a factor

of 101. This extends the measurement limit, including the effects of the signal-source purity, by a factor of 101.

10

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