WO2004095700A3 - Reconfigurable baseband filter - Google Patents

Reconfigurable baseband filter Download PDF

Info

Publication number
WO2004095700A3
WO2004095700A3 PCT/US2004/012309 US2004012309W WO2004095700A3 WO 2004095700 A3 WO2004095700 A3 WO 2004095700A3 US 2004012309 W US2004012309 W US 2004012309W WO 2004095700 A3 WO2004095700 A3 WO 2004095700A3
Authority
WO
WIPO (PCT)
Prior art keywords
switching
elements
filter
sub
baseband filter
Prior art date
Application number
PCT/US2004/012309
Other languages
French (fr)
Other versions
WO2004095700A2 (en
Inventor
Brian C Martin
Lawrence J Malone
Original Assignee
Quorum Systems Inc
Brian C Martin
Lawrence J Malone
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 Quorum Systems Inc, Brian C Martin, Lawrence J Malone filed Critical Quorum Systems Inc
Priority to EP04750423A priority Critical patent/EP1620945A2/en
Publication of WO2004095700A2 publication Critical patent/WO2004095700A2/en
Publication of WO2004095700A3 publication Critical patent/WO2004095700A3/en

Links

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
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/126—Frequency selective two-port networks using amplifiers with feedback using a single operational amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/1291—Current or voltage controlled filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H2210/00—Indexing scheme relating to details of tunable filters
    • H03H2210/02—Variable filter component
    • H03H2210/028—Resistor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H2210/00—Indexing scheme relating to details of tunable filters
    • H03H2210/03—Type of tuning
    • H03H2210/036—Stepwise

Abstract

A reconfigurable baseband filter for use in a multimode communication system is disclosed. One or more filter elements (260), (270) can each be configured as a plurality of sub-elements (262, 264), (272, 274). The value of each of the filter elements can be varied by switching between at least two of the plurality of sub-elements. Switching noise within a desired passband can be reduced by switching at a rate that is greater than the desired passband. The switching noise in the passband can be further reduced by pseudo-randomly switching between the sub-elements. The filter can use a delta-sigma modulator to generate a pseudo-random switching signal.
PCT/US2004/012309 2003-04-21 2004-04-20 Reconfigurable baseband filter WO2004095700A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04750423A EP1620945A2 (en) 2003-04-21 2004-04-20 Reconfigurable baseband filter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US46416203P 2003-04-21 2003-04-21
US60/464,162 2003-04-21

Publications (2)

Publication Number Publication Date
WO2004095700A2 WO2004095700A2 (en) 2004-11-04
WO2004095700A3 true WO2004095700A3 (en) 2005-02-24

Family

ID=33310858

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/012309 WO2004095700A2 (en) 2003-04-21 2004-04-20 Reconfigurable baseband filter

Country Status (3)

Country Link
US (1) US7676211B2 (en)
EP (1) EP1620945A2 (en)
WO (1) WO2004095700A2 (en)

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100541076B1 (en) * 2003-01-03 2006-01-11 삼성전기주식회사 Mixer and frequency conversion apparatus for improving phase-mismatching
US7590396B2 (en) * 2005-10-06 2009-09-15 Broadcom Corporation Multimode communication device with shared signal path programmable filter
US7912428B2 (en) * 2005-11-16 2011-03-22 Broadcom Corporation System and method providing variable-frequency IF conversion in a multimode communication device
US7941179B2 (en) 2005-12-21 2011-05-10 Broadcom Corporation System and method providing concurrent multimode communication
US8144125B2 (en) 2006-03-30 2012-03-27 Cypress Semiconductor Corporation Apparatus and method for reducing average scan rate to detect a conductive object on a sensing device
US20080092188A1 (en) * 2006-09-28 2008-04-17 Ahmadreza Rofougaran Method And System For Integrated Cable Modem And DVB-H Receiver And/Or Transmitter
US8547114B2 (en) * 2006-11-14 2013-10-01 Cypress Semiconductor Corporation Capacitance to code converter with sigma-delta modulator
US8144126B2 (en) 2007-05-07 2012-03-27 Cypress Semiconductor Corporation Reducing sleep current in a capacitance sensing system
US8089289B1 (en) 2007-07-03 2012-01-03 Cypress Semiconductor Corporation Capacitive field sensor with sigma-delta modulator
US8570053B1 (en) 2007-07-03 2013-10-29 Cypress Semiconductor Corporation Capacitive field sensor with sigma-delta modulator
US8525798B2 (en) 2008-01-28 2013-09-03 Cypress Semiconductor Corporation Touch sensing
US7957716B2 (en) * 2008-07-28 2011-06-07 Freescale Semiconductor, Inc. Baseband filters for use in wireless communication devices
KR20100096324A (en) * 2009-02-24 2010-09-02 삼성전자주식회사 Operating mehtod and apparatus for digital radio frequency receiver in wireless communication system
US9069405B2 (en) 2009-07-28 2015-06-30 Cypress Semiconductor Corporation Dynamic mode switching for fast touch response
US8723827B2 (en) 2009-07-28 2014-05-13 Cypress Semiconductor Corporation Predictive touch surface scanning
US20110072064A1 (en) * 2009-09-18 2011-03-24 Ho-Cheng Wei Reduce interference for kvm system
WO2012027003A1 (en) 2010-08-23 2012-03-01 Cypress Semiconductor Corporation Capacitance scanning proximity detection
EP2432130B1 (en) * 2010-09-13 2015-07-08 Imec SAW filter-less transmitter architecture
US8731099B2 (en) * 2010-09-13 2014-05-20 Imec Wireless transmitters
KR102130452B1 (en) 2013-07-26 2020-07-06 삼성전자주식회사 Analog baseband filter apparatus for multi-band and multi-mode wireless transceiver and controlling method therefor
US9300337B2 (en) 2013-12-20 2016-03-29 Qualcomm Incorporated Reconfigurable carrier-aggregation receiver and filter
US9743182B2 (en) * 2015-12-18 2017-08-22 Cirrus Logic, Inc. Systems and methods of configuring a filter having at least two frequency response configurations
US10117020B2 (en) 2015-12-18 2018-10-30 Cirrus Logic, Inc. Systems and methods for restoring microelectromechanical system transducer operation following plosive event
US9991875B2 (en) 2016-08-12 2018-06-05 Qualcomm Incorporated Reconfigurable radio frequency (RF) bandstop/intermediate frequency (IF) bandpass filter
US10230332B2 (en) 2016-08-18 2019-03-12 Skyworks Solutions, Inc. Apparatus and methods for biasing low noise amplifiers
US10171045B2 (en) 2016-08-18 2019-01-01 Skyworks Solutions, Inc. Apparatus and methods for low noise amplifiers with mid-node impedance networks
US11863140B2 (en) 2020-06-29 2024-01-02 Qualcomm Incorporated Programmable baseband filter for selecting between single-pole or complex-poles frequency response

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2731883A1 (en) * 1977-07-14 1979-02-01 Perthen Gmbh Dr Ing Filter for separation of two frequency spectra - has resistances of RC filter sections switched between two values at high frequency
US4300435A (en) * 1979-09-06 1981-11-17 Cbs Inc. Synthesizer for organ voices
GB2081543A (en) * 1980-07-01 1982-02-17 Secr Defence Commutated resistor circuit
US5563573A (en) * 1994-10-26 1996-10-08 Hughes Aircraft Company Pseudo-random switched resistor
EP1098449A1 (en) * 1999-11-04 2001-05-09 Siemens Aktiengesellschaft Receiver for receiving signals with different frequency bandwidths in different frequency bands

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU771891A2 (en) * 1978-08-18 1980-10-15 Предприятие П/Я А-7287 Discrete matched filter
US4644304A (en) * 1981-08-17 1987-02-17 The Regents Of The University Of Calif. Switched-capacitor pseudo-n-path filter
US7123182B1 (en) * 1987-06-24 2006-10-17 Bae Systems Electronics Limited Time sharing jammers
US5181033A (en) * 1992-03-02 1993-01-19 General Electric Company Digital filter for filtering and decimating delta sigma modulator output signals
US5403262A (en) * 1993-03-09 1995-04-04 Microtek Medical, Inc. Minimum energy tinnitus masker
CA2229737A1 (en) * 1998-02-18 1999-08-18 Philsar Electronics Inc. Analog to digital converter for radio applications
US6748025B1 (en) * 1999-02-02 2004-06-08 Technoconcepts, Inc. Direct conversion delta-sigma receiver
US6351506B1 (en) * 1999-04-19 2002-02-26 National Semiconductor Corporation Switched capacitor filter circuit having reduced offsets and providing offset compensation when used in a closed feedback loop
US6351229B1 (en) * 2000-09-05 2002-02-26 Texas Instruments Incorporated Density-modulated dynamic dithering circuits and method for delta-sigma converter
US6975600B1 (en) * 2000-09-18 2005-12-13 The Directv Group, Inc. Multimode transmission system using TDMA
JP2002359543A (en) * 2001-06-01 2002-12-13 Matsushita Electric Ind Co Ltd Filter circuit and mobile communication device using the same
US7051063B2 (en) * 2002-05-03 2006-05-23 Atheros Communications, Inc. Integrated low power channel select filter having high dynamic range and bandwidth
US6975846B2 (en) * 2002-05-23 2005-12-13 Intel Corporation Method and circuit to reduce intermodulation distortion
US6975848B2 (en) * 2002-06-04 2005-12-13 Parkervision, Inc. Method and apparatus for DC offset removal in a radio frequency communication channel
US7340019B2 (en) * 2003-04-02 2008-03-04 Intel Corporation Programmable filter
US6970120B1 (en) * 2004-06-12 2005-11-29 Nordic Semiconductor Asa Method and apparatus for start-up of analog-to-digital converters

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2731883A1 (en) * 1977-07-14 1979-02-01 Perthen Gmbh Dr Ing Filter for separation of two frequency spectra - has resistances of RC filter sections switched between two values at high frequency
US4300435A (en) * 1979-09-06 1981-11-17 Cbs Inc. Synthesizer for organ voices
GB2081543A (en) * 1980-07-01 1982-02-17 Secr Defence Commutated resistor circuit
US5563573A (en) * 1994-10-26 1996-10-08 Hughes Aircraft Company Pseudo-random switched resistor
EP1098449A1 (en) * 1999-11-04 2001-05-09 Siemens Aktiengesellschaft Receiver for receiving signals with different frequency bandwidths in different frequency bands

Also Published As

Publication number Publication date
US20040209591A1 (en) 2004-10-21
US7676211B2 (en) 2010-03-09
WO2004095700A2 (en) 2004-11-04
EP1620945A2 (en) 2006-02-01

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