Fast-settling DC offset removal circuits with continuous cutoff frequency switching

A circuit and stabilization technology, applied in electrical components, power oscillators, transmission systems, etc., can solve problems such as dependence on signal levels and unreliable stabilization

Active Publication Date: 2009-01-28
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method cannot be reliably stabilized because the discontinuous switching action itself will generate a DC offset, which depends on the signal levels at the input and output at the switching instant

Method used

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  • Fast-settling DC offset removal circuits with continuous cutoff frequency switching
  • Fast-settling DC offset removal circuits with continuous cutoff frequency switching
  • Fast-settling DC offset removal circuits with continuous cutoff frequency switching

Examples

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Embodiment Construction

[0038] In the current preferred embodiment of the present invention, as figure 2 As shown, the circuit includes: a first capacitor, one end of the first capacitor is connected to an input node, the second end of the first capacitor is connected to the first output node; a second capacitor, one end of the second capacitor is connected to The second input node is connected, and the second end of the second capacitor is connected to the second output node; the first continuously variable resistor, the first end of the first continuously variable resistor is connected to the first output node, and the first continuously The second terminal of the variable resistor is connected to the common-state voltage source V cm connection; the second continuously variable resistor, the first terminal of the second continuously variable resistor is connected to the second output node, the second terminal of the second continuously variable resistor is connected to the common voltage source V ...

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PUM

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Abstract

A fast-setting DC offset removal circuit with continuous cutoff frequency switching is disclosed. In the preferred embodiment, the circuit is implemented using a pair of RC filters for receiving a differential signal pair and a continuous, variable resistance control circuit. The control circuit can be current-controlled or voltage controlled to provide fast settling of the received signal and the removal of the DC offset components. Additionally, by using a current-controlled control circuit, the cutoff frequency of the RC filter can be ramped from high to low in a continuous manner, thereby minimizing the generation of DC offsets.

Description

technical field [0001] The present invention relates generally to signal conditioning circuits, and more particularly to circuits for fast-settling signal conditioning and DC offset cancellation. Background technique [0002] When processing a received signal, it is often desirable for the received signal to stabilize quickly in order to process the signal. However, as the signal propagates or is processed in the circuit, undesired direct current (DC) offset components may be introduced into the received signal from multiple sources. These distorted signals would be difficult to decode, thus causing further complications and undesired offsets to downstream circuitry. Therefore, eliminating this undesirable DC offset component and quickly stabilizing the received signal has become an important subject for many applications. [0003] For example, since the zero-intermediate frequency (Zero-IF) structure has lower requirements on channel selection filters and amplifiers, in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B1/00H04B1/30
CPCH03D2200/0047H04B1/30
Inventor 曹堪宇陈东山李虹宇赵介元
Owner MEDIATEK INC
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