WO2001047108A3 - Error reduction in quadrature polyphase filters with low open loop gain operational amplifiers - Google Patents

Error reduction in quadrature polyphase filters with low open loop gain operational amplifiers Download PDF

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Publication number
WO2001047108A3
WO2001047108A3 PCT/US2000/034674 US0034674W WO0147108A3 WO 2001047108 A3 WO2001047108 A3 WO 2001047108A3 US 0034674 W US0034674 W US 0034674W WO 0147108 A3 WO0147108 A3 WO 0147108A3
Authority
WO
WIPO (PCT)
Prior art keywords
open loop
operational amplifiers
loop gain
low open
polyphase filters
Prior art date
Application number
PCT/US2000/034674
Other languages
French (fr)
Other versions
WO2001047108A2 (en
Inventor
Thomas Hornak
Original Assignee
Agilent Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Agilent Technologies Inc filed Critical Agilent Technologies Inc
Priority to DE60006164T priority Critical patent/DE60006164T2/en
Priority to EP00993559A priority patent/EP1256167B1/en
Priority to JP2001547732A priority patent/JP2003518796A/en
Publication of WO2001047108A2 publication Critical patent/WO2001047108A2/en
Publication of WO2001047108A3 publication Critical patent/WO2001047108A3/en

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/16—Networks for phase shifting
    • H03H11/22—Networks for phase shifting providing two or more phase shifted output signals, e.g. n-phase output

Abstract

A polyphase filter passes a desired frequency and attenuates an image frequency in many communication systems. The invention is an error correction circuit that compensates the polyphase filter for low open loop gain operational amplifiers. When multiple polyphase filters are used in communication circuits on a single integrated circuit (IC), the open loop gain of the operational amplifiers is limited by the IC's ability to dissipate power. The error correction circuit reduces the dependency of the polyphase filter performance on the low open loop gain of its operational amplifiers and hence, on temperature and IC process parameters.
PCT/US2000/034674 1999-12-21 2000-12-19 Error reduction in quadrature polyphase filters with low open loop gain operational amplifiers WO2001047108A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE60006164T DE60006164T2 (en) 1999-12-21 2000-12-19 ERROR REDUCTION IN SQUARE POLYPHASE FILTER WITH OPERATIONAL AMPLIFIER WITH LOW OPEN LOOP REINFORCEMENT
EP00993559A EP1256167B1 (en) 1999-12-21 2000-12-19 Error reduction in quadrature polyphase filters with low open loop gain operational amplifiers
JP2001547732A JP2003518796A (en) 1999-12-21 2000-12-19 Error reduced quadrature polyphase filter with low open loop gain operational amplifier

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/469,192 US6198345B1 (en) 1999-12-21 1999-12-21 Error reduction in quadrature polyphase filters with low open loop gain operational amplifiers
US09/469,192 1999-12-21

Publications (2)

Publication Number Publication Date
WO2001047108A2 WO2001047108A2 (en) 2001-06-28
WO2001047108A3 true WO2001047108A3 (en) 2002-01-03

Family

ID=23862817

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/034674 WO2001047108A2 (en) 1999-12-21 2000-12-19 Error reduction in quadrature polyphase filters with low open loop gain operational amplifiers

Country Status (5)

Country Link
US (1) US6198345B1 (en)
EP (1) EP1256167B1 (en)
JP (1) JP2003518796A (en)
DE (1) DE60006164T2 (en)
WO (1) WO2001047108A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6987966B1 (en) * 1999-10-21 2006-01-17 Broadcom Corporation Adaptive radio transceiver with polyphase calibration
US8139160B2 (en) * 2006-10-25 2012-03-20 Mstar Semiconductor, Inc. Television tuner with double quadrature mixing architecture

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4723318A (en) * 1984-12-19 1988-02-02 U.S. Philips Corporation Active polyphase filters
EP0344852A1 (en) * 1988-06-02 1989-12-06 Koninklijke Philips Electronics N.V. Asymmetric polyphase filter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100379048B1 (en) * 1995-04-03 2003-06-11 코닌클리케 필립스 일렉트로닉스 엔.브이. Quadrature Signal Conversion Device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4723318A (en) * 1984-12-19 1988-02-02 U.S. Philips Corporation Active polyphase filters
EP0344852A1 (en) * 1988-06-02 1989-12-06 Koninklijke Philips Electronics N.V. Asymmetric polyphase filter

Also Published As

Publication number Publication date
DE60006164D1 (en) 2003-11-27
EP1256167B1 (en) 2003-10-22
DE60006164T2 (en) 2004-07-22
EP1256167A2 (en) 2002-11-13
US6198345B1 (en) 2001-03-06
JP2003518796A (en) 2003-06-10
WO2001047108A2 (en) 2001-06-28

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