Apparatus and methods for multi-channel autozero and chopper amplifiers

An automatic zeroing and amplifier technology, applied in amplifiers, differential amplifiers, DC-coupled DC amplifiers, etc., can solve problems affecting the operating performance of amplifiers

Active Publication Date: 2015-10-28
ANALOG DEVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] While the inclusion of amplifier auto-zero and / or chopper circuits can reduce the amplifier's input offset voltage, auto-zero and / or chopper circuits can also affect the operational performance of the amplifier, such as by generating output glitches and / or noise

Method used

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  • Apparatus and methods for multi-channel autozero and chopper amplifiers
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  • Apparatus and methods for multi-channel autozero and chopper amplifiers

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Embodiment Construction

[0018] Various descriptions of specific embodiments of the invention are set forth in the following detailed description of certain embodiments of the invention. However, the invention can be embodied in many different ways, as defined and covered by the claims. In this specification, reference is made to the drawings, wherein like reference numerals may indicate identical or functionally similar elements.

[0019] Without compensation, the amplifier can have an input offset voltage. For example, amplifiers fabricated using conventional complementary metal-oxide-semiconductor (CMOS) processes may have input offset voltages, for example, in the range of about 1 mV to about 10 millivolts. Amplifiers may also have flicker or 1 / f noise, which may have an associated noise power spectral density (PSD), which becomes larger at lower frequencies.

[0020] To reduce or remove input bias voltage and / or flicker noise, the amplifier may include a chopper circuit. In one example, the ch...

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Abstract

Apparatus and methods for multi-channel autozero and chopper amplifiers are provided herein. In certain configurations, an amplifier includes at least three channels that operate using multiple phases, including at least a non-inverting chop phase, an inverting chop phase, and an autozero phase. The amplifier further includes an autozero and chopping timing control circuit, which at least partially interleaves or staggers timing of the channels' phases. For example, in certain configurations, when one or more of the channels are being autozeroed at a certain time instance, at least some of the remaining channels operate in the non-inverting chop phase or the inverting chop phase.

Description

technical field [0001] Embodiments of the present invention relate to electronic systems, and more particularly to amplifiers. Background technique [0002] Amplifiers, such as operational amplifiers or instrumentation amplifiers, may include auto-zeroing and / or chopping circuitry to reduce the amplifier's input offset voltage. [0003] In one example, an auto-zero amplifier may include a main amplifier, an auxiliary amplifier, and a capacitor, and the auxiliary amplifier may operate in an auto-zero phase to store a voltage across the capacitor to correct for an input offset voltage of the main amplifier. In another example, a chopping amplifier includes an input chopping switch operable to chop or condition an input signal to the amplifier during an input chopping operation, thereby shifting up the frequency of the input signal to the amplifier. Furthermore, the chopped amplifier may comprise a filter for filtering the input offset voltage of said amplifier, which may be s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/26H03F3/45
CPCH03F3/387H03F3/45076H03F2200/252H03F2200/421H03F2203/45171H03F3/45475H03F3/45968
Inventor 楠田义则
Owner ANALOG DEVICES INC
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