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Method for an offset-free operation amplifier without adjustment

IP.com Disclosure Number: IPCOM000008677D
Publication Date: 2002-Jul-02
Document File: 3 page(s) / 154K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for an offset-free operation amplifier without adjustment. Benefits include improved quality.

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Method for an offset-free operation amplifier without adjustment

Disclosed is a method for an offset-free operation amplifier without adjustment. Benefits include improved quality.

Background

      In electrical measurements and in many other application areas, the offset voltages of real operation amplifiers play a decisive role to achieve required parameters.

      Conventionally, various static and dynamic offset compensation methods exist to reduce offset voltages to a minimum. All conventional static methods add high costs during production because they require additional adjustment circuitry components.

      Dynamic offset compensation methods, such as chopper stabilization, require a high degree of effort and generate high impulse interference levels. These impulses are caused by their clock pulses. They can be lowered to meet user requirements by expensive filter circuits.

      Urgent requirements for the use of offset-free operation amplifiers surface arised from the development of precise voltage and current-reference sources.

Description

      The disclosed method is that two amplifiers with identical offset voltage are switched so their offset voltages subtract each other in the compensated amplifier (see Figure 1).

The output, designated as OUT1, is offset free (see Figure 2). In comparison, conventional operational amplifiers (see Figure 3) have an output, OUT1, with offset.

      The offset-free operation amplifier, OPAcomp, is suitable for integrated circuit technology where, by corresponding...