OPA2604 Datasheet, PDF (10/26 Pages) Burr-Brown (TI) – Dual FET-Input, Low Distortion OPERATIONAL AMPLIFIER

OPA2604
SBOS006A – SEPTEMBER 2000 – REVISED DECEMBER 2015
7 Detailed Description
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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
(8)
V+
(+)
(3, 5)
(–)
(2, 6)
Distortion
Rejection
Circuitry*
Output
Stage*
(1, 7)
V_O
(4)
V–
* Patents Granted:
#5053718, 5019789
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
R₃ to the otherwise standard noninverting amplifier configuration alters the feedback factor or noise gain of the
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.
The input signal and load applied to the op amp are the same as with conventional feedback without R₃.
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