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Apparatus and method for notch filtering

A notch filter, notch technology, used in networks using active components, amplifiers with semiconductor devices/discharge tubes, switched capacitor networks, etc.

Active Publication Date: 2016-05-18
ANALOG DEVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although configuring an amplifier to include a chopper circuit and a notch filter can reduce the input offset voltage of the amplifier, mismatch errors in the notch filter can cause the amplifier to have an offset and / or the output signal of the amplifier to have The chopping frequency and the ripple at its harmonics

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  • Apparatus and method for notch filtering
  • Apparatus and method for notch filtering
  • Apparatus and method for notch filtering

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Embodiment Construction

[0018] The following detailed description of specific embodiments presents various descriptions of specific embodiments of the invention. However, the invention can be embodied in various ways other than those defined and covered by the claims. In the present description, reference is made to the drawings in which like reference numbers indicate identical or functionally similar elements.

[0019] Apparatus and methods for notch filtering are provided. In a particular embodiment, an amplifier includes: an amplification stage for providing signal amplification; a chopper circuit for generating a chopped signal by chopping an amplified signal associated with the amplification stage at a chopping frequency and a time-interleaved finite impulse response (FIR) notch filter for notching frequency components of the chopped signal close to the chopping frequency. The time-interleaved FIR notch filter includes a plurality of FIR filters configured to sample the chopped signal at a sa...

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Abstract

The invention provides a device and method for notch filtering. In a particular embodiment, an amplifier includes: an amplification stage for providing signal amplification; a chopper circuit for generating a chopped signal by chopping an amplified signal associated with the amplification stage at a chopping frequency and a time-interleaved finite impulse response (FIR) notch filter for notching frequency components of the chopped signal close to the chopping frequency. The time-interleaved FIR notch filter includes a plurality of FIR filters configured to sample the chopped signal at a sampling rate approximately equal to twice the chopping frequency. The FIR filters are time interleaved to reduce sampling errors. Additionally, the time-interleaved FIR notch filter includes an infinite impulse response (IIR) filter configured to average samples taken by the FIR filter and integrate the averaged samples to generate the time-interleaved FIR notch filter output signal of the wave filter.

Description

technical field [0001] Embodiments of the invention relate to electronic devices, and more particularly to notch filters. Background technique [0002] Amplifiers, such as operational amplifiers, may include chopper circuits and notch filters that help reduce the amplifier's input offset voltage. For example, the amplifier may comprise a first chopper circuit for periodically switching or chopping the positive and negative inputs of the input stage of the amplifier at a chopping frequency; and a second chopper circuit for The positive and negative outputs of the input stage of the amplifier are periodically swapped or chopped at the chopping frequency. Furthermore, a notch filter may be used to generate a notch signal by attenuating frequency components of the output signal of the second chopper circuit at the chopping frequency. Thereafter, the notched signal may be amplified to generate the output signal of the amplifier. [0003] The second chopping circuit is operable...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H11/34
CPCH03H19/004H03H2011/0488H03F3/387
Inventor F·阿玛德
Owner ANALOG DEVICES INC