IT1250972B - Apparecchio e procedimento per la correzione dello sfalsamento in cc per un ricevitore. - Google Patents
Apparecchio e procedimento per la correzione dello sfalsamento in cc per un ricevitore.Info
- Publication number
- IT1250972B IT1250972B ITRM910959A ITRM910959A IT1250972B IT 1250972 B IT1250972 B IT 1250972B IT RM910959 A ITRM910959 A IT RM910959A IT RM910959 A ITRM910959 A IT RM910959A IT 1250972 B IT1250972 B IT 1250972B
- Authority
- IT
- Italy
- Prior art keywords
- offset
- radio receiver
- adaptive
- input signal
- receiver
- Prior art date
Links
- 230000003044 adaptive effect Effects 0.000 abstract 3
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
- H04L27/233—Demodulator circuits; Receiver circuits using non-coherent demodulation
- H04L27/2332—Demodulator circuits; Receiver circuits using non-coherent demodulation using a non-coherent carrier
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/007—Demodulation of angle-, frequency- or phase- modulated oscillations by converting the oscillations into two quadrature related signals
- H03D3/008—Compensating DC offsets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/30—Circuits for homodyne or synchrodyne receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
- H04L25/062—Setting decision thresholds using feedforward techniques only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
- H04L25/063—Setting decision thresholds using feedback techniques only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Noise Elimination (AREA)
- Amplifiers (AREA)
- Circuits Of Receivers In General (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Oggetto dell'invenzione è un radio ricevitore avente almeno due stadi operativi e comprendente un amplificatore con guadagno variabile ed almeno due compensatori di sfalsamento in CC adattativi (421, 427) per sopprimere l'indesiderato sfalsamento in CC.Il primo stato operativo del radio ricevitore (121) regola i circuiti di compensazione di sfalsamento in CC adattativi (421, 427) su appropriati livelli di uscita in assenza di un segnale di ingresso al radio ricevitore (121).Il secondo stato operativo riceve il segnale di ingresso attraverso il radio ricevitore (121) ed elimina l'indesiderato sfalsamento in CC (309) del segnale di ingresso ricevuto per mezzo dei circuiti di compensazione di sfalsamento in CC adattativi (421, 427) e consente la elaborazione dei segnali di ingresso ricevuti.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/630,644 US5212826A (en) | 1990-12-20 | 1990-12-20 | Apparatus and method of dc offset correction for a receiver |
Publications (3)
Publication Number | Publication Date |
---|---|
ITRM910959A0 ITRM910959A0 (it) | 1991-12-19 |
ITRM910959A1 ITRM910959A1 (it) | 1993-06-19 |
IT1250972B true IT1250972B (it) | 1995-04-24 |
Family
ID=24528009
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ITRM910959A IT1250972B (it) | 1990-12-20 | 1991-12-19 | Apparecchio e procedimento per la correzione dello sfalsamento in cc per un ricevitore. |
Country Status (13)
Country | Link |
---|---|
US (1) | US5212826A (it) |
KR (1) | KR960008948B1 (it) |
CN (1) | CN1029579C (it) |
AU (1) | AU641075B2 (it) |
BR (1) | BR9106404A (it) |
CA (1) | CA2071551C (it) |
DE (2) | DE4193233C2 (it) |
FR (1) | FR2670965B1 (it) |
GB (1) | GB2256985B (it) |
IT (1) | IT1250972B (it) |
MX (1) | MX9102712A (it) |
SE (1) | SE515885C2 (it) |
WO (1) | WO1992011703A1 (it) |
Families Citing this family (46)
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DE4143537C2 (de) * | 1990-12-20 | 1996-11-28 | Motorola Inc | Einrichtung und Verfahren zur Gleichstromversatz-Korrektur für einen Empfänger |
DE4341937A1 (de) * | 1993-12-09 | 1995-06-14 | Philips Patentverwaltung | Elektrisches Gerät mit einer Anordnung zur Kompensation eines Gleichspannungsanteils |
US5469305A (en) * | 1993-12-17 | 1995-11-21 | Seagate Technology, Inc. | AC timing asymmetry reduction circuit including summing DC offset voltage with timing signal |
JP2746158B2 (ja) * | 1994-11-25 | 1998-04-28 | 日本電気株式会社 | Ad変換回路 |
US5724653A (en) * | 1994-12-20 | 1998-03-03 | Lucent Technologies Inc. | Radio receiver with DC offset correction circuit |
TW294867B (it) * | 1994-12-23 | 1997-01-01 | Qualcomm Inc | |
US5748681A (en) * | 1995-10-27 | 1998-05-05 | Lucent Technologies Inc | Offset correction for a homodyne radio |
FI112131B (fi) * | 1996-02-08 | 2003-10-31 | Nokia Corp | Menetelmä ja piirijärjestely signaalin erojännitteen pienentämiseksi |
FI106328B (fi) | 1996-02-08 | 2001-01-15 | Nokia Mobile Phones Ltd | Menetelmä ja piirijärjestely vastaanotetun signaalin käsittelemiseksi |
US5745848A (en) * | 1996-03-04 | 1998-04-28 | Motorola, Inc. | Method and apparatus for eliminating interference caused by spurious signals in a communication device |
GB9605719D0 (en) * | 1996-03-19 | 1996-05-22 | Philips Electronics Nv | Integrated receiver |
FI961935A (fi) * | 1996-05-07 | 1997-11-08 | Nokia Mobile Phones Ltd | Erojännitteen eliminointi ja AM-vaimennus suoramuunnosvastaanottimessa |
US6498929B1 (en) * | 1996-06-21 | 2002-12-24 | Kabushiki Kaisha Toshiba | Receiver having DC offset decreasing function and communication system using the same |
US5838735A (en) * | 1996-07-08 | 1998-11-17 | Telefonaktiebolaget Lm Ericsson | Method and apparatus for compensating for a varying d.c. offset in a sampled signal |
CN1101091C (zh) * | 1996-09-06 | 2003-02-05 | 皇家菲利浦电子有限公司 | 零中频接收机 |
JP2993443B2 (ja) * | 1996-10-31 | 1999-12-20 | 日本電気株式会社 | 通信装置 |
FI105367B (fi) * | 1997-04-04 | 2000-07-31 | Nokia Mobile Phones Ltd | Häiriönvaimennus RF-signaaleissa |
JP3125717B2 (ja) * | 1997-05-30 | 2001-01-22 | 日本電気株式会社 | 直交変復調回路を用いた無線通信装置 |
US6240100B1 (en) * | 1997-07-31 | 2001-05-29 | Motorola, Inc. | Cellular TDMA base station receiver with dynamic DC offset correction |
EP0948128B1 (en) * | 1998-04-03 | 2004-12-01 | Motorola Semiconducteurs S.A. | DC offset cancellation in a quadrature receiver |
US6356749B1 (en) * | 1998-11-04 | 2002-03-12 | Motorola, Inc. | Automatic adapt circuit for circumventing demodulator transients in radio receiver |
DE19904376A1 (de) * | 1999-02-03 | 2000-08-17 | Siemens Ag | Verfahren und Schaltung zur Kompensationssteuerung von Offsetspannungen einer in einem Schaltungsbaustein integrierten Funkempfangsschaltung |
GB2346777B (en) * | 1999-02-12 | 2004-04-07 | Nokia Mobile Phones Ltd | DC offset correction in a direct conversion receiver |
US6826388B1 (en) * | 1999-11-15 | 2004-11-30 | Renesas Technology Corp. | Mobile communication apparatus including dividers in transmitter and receiver |
US6356217B1 (en) * | 2000-02-29 | 2002-03-12 | Motorola, Inc. | Enhanced DC offset correction through bandwidth and clock speed selection |
US6748200B1 (en) | 2000-10-02 | 2004-06-08 | Mark A. Webster | Automatic gain control system and method for a ZIF architecture |
US7068987B2 (en) | 2000-10-02 | 2006-06-27 | Conexant, Inc. | Packet acquisition and channel tracking for a wireless communication device configured in a zero intermediate frequency architecture |
GB2371931B (en) * | 2001-02-06 | 2004-10-20 | Nokia Mobile Phones Ltd | Processing received signals |
DE10131676A1 (de) * | 2001-06-29 | 2003-01-16 | Infineon Technologies Ag | Empfängeranordnung mit Wechselstrom-Kopplung |
US7027791B2 (en) * | 2001-09-28 | 2006-04-11 | International Business Machines Corporation | Analog baseband signal processing system and method |
US6975845B2 (en) * | 2002-01-22 | 2005-12-13 | Nokia Corporation | Direct conversion receiver architecture |
US7006824B1 (en) | 2002-09-10 | 2006-02-28 | Marvell International Ltd. | Frame/packet-based calibration for wireless transceivers |
US7215933B1 (en) | 2002-09-24 | 2007-05-08 | Marvell International Ltd. | Local transmitter output power control system for wireless applications |
US6983135B1 (en) | 2002-11-11 | 2006-01-03 | Marvell International, Ltd. | Mixer gain calibration method and apparatus |
JP2004201044A (ja) * | 2002-12-19 | 2004-07-15 | Sony Ericsson Mobilecommunications Japan Inc | 携帯通信端末装置及び利得可変回路 |
US7376400B2 (en) * | 2003-09-25 | 2008-05-20 | Texas Instruments Incorporated | System and method for digital radio receiver |
EP1578023B1 (en) * | 2004-03-18 | 2010-11-24 | Infineon Technologies AG | AC coupling bandwidth switch |
US7383518B1 (en) * | 2004-11-01 | 2008-06-03 | Synopsys, Inc. | Method and apparatus for performance metric compatible control of data transmission signals |
CN100369383C (zh) * | 2004-12-17 | 2008-02-13 | 北京六合万通微电子技术有限公司 | 无线接收系统中直流失调的消除方法、装置及系统 |
JP4667055B2 (ja) * | 2005-02-02 | 2011-04-06 | 富士通テン株式会社 | 無線受信機におけるdcオフセット補正装置及び方法 |
US7899431B2 (en) * | 2005-04-04 | 2011-03-01 | Freescale Semiconductor, Inc. | DC offset correction system for a receiver with baseband gain control |
US7622987B1 (en) | 2007-01-25 | 2009-11-24 | Pmc-Sierra, Inc. | Pattern-based DC offset correction |
CN101471680B (zh) * | 2007-12-24 | 2012-12-12 | 北京六合万通微电子技术股份有限公司 | 一种无线接收机及消除无线接收机中直流失调的方法 |
US8027651B2 (en) * | 2008-12-05 | 2011-09-27 | Motorola Solutions, Inc. | Method and apparatus for removing DC offset in a direct conversion receiver |
EP2299588B1 (en) * | 2009-09-11 | 2012-12-19 | Stichting IMEC Nederland | Receiver with improved flicker noise performance |
JP5558858B2 (ja) * | 2010-02-15 | 2014-07-23 | 株式会社東芝 | 超音波プローブ |
Family Cites Families (9)
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US3846710A (en) * | 1973-02-02 | 1974-11-05 | Motorola Inc | Dc restoration amplifier with automatic zero offset adjustment |
US4575863A (en) * | 1983-12-22 | 1986-03-11 | Motorola, Inc. | Fast recovery bias circuit |
JPS60143028A (ja) * | 1983-12-29 | 1985-07-29 | Matsushita Electric Ind Co Ltd | 雑音低減装置 |
US4564821A (en) * | 1984-10-01 | 1986-01-14 | Motorola, Inc. | Offset cancelling AC level detector using an oscillator |
DE3500217C2 (de) * | 1985-01-05 | 1995-04-13 | Blaupunkt Werke Gmbh | Verfahren und Schaltungsanordnung zum Unterdrücken von Zwischenstationsgeräuschen |
US4742514A (en) * | 1986-03-25 | 1988-05-03 | Motorola, Inc. | Method and apparatus for controlling a TDM communication device |
US4829594A (en) * | 1986-09-23 | 1989-05-09 | Motorola, Inc. | Adaptive correction of DC error transients |
CH676404A5 (it) * | 1988-11-22 | 1991-01-15 | Ascom Radiocom Ag | |
US5003621A (en) * | 1989-11-02 | 1991-03-26 | Motorola, Inc. | Direct conversion FM receiver |
-
1990
- 1990-12-20 US US07/630,644 patent/US5212826A/en not_active Expired - Lifetime
-
1991
- 1991-12-18 BR BR919106404A patent/BR9106404A/pt not_active IP Right Cessation
- 1991-12-18 AU AU91786/91A patent/AU641075B2/en not_active Ceased
- 1991-12-18 DE DE4193233A patent/DE4193233C2/de not_active Expired - Lifetime
- 1991-12-18 GB GB9217655A patent/GB2256985B/en not_active Expired - Lifetime
- 1991-12-18 KR KR1019920701990A patent/KR960008948B1/ko not_active IP Right Cessation
- 1991-12-18 CA CA002071551A patent/CA2071551C/en not_active Expired - Lifetime
- 1991-12-18 DE DE19914193233 patent/DE4193233T/de active Pending
- 1991-12-18 WO PCT/US1991/009584 patent/WO1992011703A1/en active Application Filing
- 1991-12-19 IT ITRM910959A patent/IT1250972B/it active IP Right Grant
- 1991-12-19 MX MX9102712A patent/MX9102712A/es unknown
- 1991-12-20 CN CN91111740A patent/CN1029579C/zh not_active Expired - Lifetime
- 1991-12-20 FR FR9115945A patent/FR2670965B1/fr not_active Expired - Lifetime
-
1992
- 1992-08-19 SE SE9202381A patent/SE515885C2/sv not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
SE9202381D0 (sv) | 1992-08-19 |
MX9102712A (es) | 1992-06-01 |
DE4193233C2 (de) | 1995-06-01 |
GB2256985B (en) | 1995-07-19 |
CA2071551A1 (en) | 1992-06-21 |
US5212826A (en) | 1993-05-18 |
GB9217655D0 (en) | 1992-10-28 |
KR920704438A (ko) | 1992-12-19 |
SE515885C2 (sv) | 2001-10-22 |
BR9106404A (pt) | 1993-05-04 |
AU641075B2 (en) | 1993-09-09 |
KR960008948B1 (ko) | 1996-07-10 |
CN1029579C (zh) | 1995-08-23 |
WO1992011703A1 (en) | 1992-07-09 |
FR2670965A1 (fr) | 1992-06-26 |
DE4193233T (it) | 1992-12-10 |
AU9178691A (en) | 1992-07-22 |
SE9202381L (it) | |
ITRM910959A0 (it) | 1991-12-19 |
FR2670965B1 (fr) | 1997-11-28 |
GB2256985A (en) | 1992-12-23 |
ITRM910959A1 (it) | 1993-06-19 |
CN1065762A (zh) | 1992-10-28 |
CA2071551C (en) | 1997-03-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
0001 | Granted | ||
TA | Fee payment date (situation as of event date), data collected since 19931001 |
Effective date: 19961010 |