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US5815020: Balance differential receiver

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Filing Information

Inventor(s) Steven Peter Allen · William Chunhung Yip ·
Assignee(s) Motorola, Inc. ·
Attorney/Agent(s) James A. Coffing ·
Primary Examiner Kenneth B. Wells ·
Application Number US8718733
Filing date 09/24/1996
Issue date 09/29/1998
Predicted expiration date 09/24/2016
U.S. Classifications 327/255  · 327/238  ·
International Classifications H03H 1116  ·
Kind CodeA
International Classifications 3271-12;254;255;407;238;99;298 ·
14 Claims, No Drawings


Abstract

A quadrant detector circuit (400) has a comparator (442) having a pair of inputs (438, 440). A first (438) of the pair of inputs (438, 440) is coupled to an in-phase signal (434) and a second (440) of the pair of inputs (438, 440) is coupled to a quadrature phase signal (436). A sample counter (448) has a reset (446) coupled to an output (444) of the comparator (442). A controllable switch (456) has a selection input (454) coupled to an output (452) of the sample counter (448). The controllable switch (456) is capable of switching between a local oscillator signal (458) and an inverse local oscillator signal (460).

Independent Claims | See all claims (14)

  1. 1. A balance differential receiver circuit, comprising:quadrant detector means, operably coupled to a pair of inputs, a first of the pair of inputs coupled to an in-phase signal and a second of the pair of inputs coupled to a quadrature phase signal, for detecting a phase relationship between the in-phase signal and the quadrature signal; andquadrant rotation means, having a selection input operably coupled to the quadrant detector means, for switching between a local oscillator signal and an inverse local oscillator signal.
  2. 11. A balance differential receiver circuit, comprising:means for amplifying an in-phase signal and a quadrature phase signal to produce an amplified in-phase signal and an amplified quadrature phase signal;means for comparing the amplified in-phase signal with the amplified quadrature phase signal, wherein the means for comparing is operative to transmit an indication signal when the amplified in-phase signal and the amplified quadrature phase signal have a common polarity; androtation means, operably coupled to the indication signal, for selecting between a first local oscillator signal and a second local oscillator signal, wherein the second local oscillator signal is an inverse of the first local oscillator signal.
  3. 14.14. A method of extracting a data signal that includes an in-phase component and a quadrature phase component using a local oscillator signal, the method comprising the steps of:(a) receiving the in-phase component from an in-phase mixer;(b) receiving the quadrature phase component from a quadrature phase mixer;(c) comparing the in-phase component to the quadrature phase component to form an indication signal; and(d) selecting, responsive to the indication signal, between the local oscillator signal and an inverse of the local oscillator signal.

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Referenced By

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