GB2284718A - Adjusting telephone bandwidth using variable integrated transconductance filter - Google Patents

Adjusting telephone bandwidth using variable integrated transconductance filter Download PDF

Info

Publication number
GB2284718A
GB2284718A GB9503349A GB9503349A GB2284718A GB 2284718 A GB2284718 A GB 2284718A GB 9503349 A GB9503349 A GB 9503349A GB 9503349 A GB9503349 A GB 9503349A GB 2284718 A GB2284718 A GB 2284718A
Authority
GB
United Kingdom
Prior art keywords
signal
filter
bandwidth
frequency
signals
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB9503349A
Other languages
English (en)
Other versions
GB9503349D0 (en
Inventor
Joseph P Heck
Barry L Jason
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motorola Solutions Inc
Original Assignee
Motorola 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 Motorola Inc filed Critical Motorola Inc
Publication of GB9503349D0 publication Critical patent/GB9503349D0/en
Publication of GB2284718A publication Critical patent/GB2284718A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/16—Multiple-frequency-changing
    • H03D7/161—Multiple-frequency-changing all the frequency changers being connected in cascade
    • H03D7/163—Multiple-frequency-changing all the frequency changers being connected in cascade the local oscillations of at least two of the frequency changers being derived from a single oscillator
    • 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
    • H03H11/0422—Frequency selective two-port networks using transconductance amplifiers, e.g. gmC filters
    • H03H11/0444—Simulation of ladder networks
    • H03H11/045—Leapfrog structures

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Networks Using Active Elements (AREA)
  • Transmitters (AREA)
  • Noise Elimination (AREA)
  • Mobile Radio Communication Systems (AREA)
GB9503349A 1990-10-10 1991-08-19 Adjusting telephone bandwidth using variable integrated transconductance filter Withdrawn GB2284718A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US59506290A 1990-10-10 1990-10-10
GB9212049A GB2255461B (en) 1990-10-10 1991-08-19 Active filter circuit

Publications (2)

Publication Number Publication Date
GB9503349D0 GB9503349D0 (en) 1995-04-12
GB2284718A true GB2284718A (en) 1995-06-14

Family

ID=24381563

Family Applications (2)

Application Number Title Priority Date Filing Date
GB9503349A Withdrawn GB2284718A (en) 1990-10-10 1991-08-19 Adjusting telephone bandwidth using variable integrated transconductance filter
GB9212049A Expired - Fee Related GB2255461B (en) 1990-10-10 1991-08-19 Active filter circuit

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB9212049A Expired - Fee Related GB2255461B (en) 1990-10-10 1991-08-19 Active filter circuit

Country Status (8)

Country Link
JP (1) JPH05503409A (enrdf_load_stackoverflow)
AR (1) AR246644A1 (enrdf_load_stackoverflow)
BR (1) BR9106178A (enrdf_load_stackoverflow)
CA (1) CA2069639A1 (enrdf_load_stackoverflow)
DE (1) DE4192545T (enrdf_load_stackoverflow)
GB (2) GB2284718A (enrdf_load_stackoverflow)
MX (1) MX9101511A (enrdf_load_stackoverflow)
WO (1) WO1992007422A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1032979A2 (en) * 1997-10-29 2000-09-06 TELEFONAKTIEBOLAGET LM ERICSSON (publ) Arrangement and method relating to radio communication

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6489847B1 (en) 2000-01-28 2002-12-03 Telefonaktiebolaget Lm Ericsson Low distoration driving amplifier for integrated filters
GB2394133A (en) 2002-10-17 2004-04-14 Toumaz Technology Ltd Radio receiver with reconfigurable filtering arrangement

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB491693A (en) * 1937-01-21 1938-09-07 Hazeltine Corp Improvements in variable selectivity radio receivers
GB856892A (en) * 1957-11-14 1960-12-21 Collins Radio Co Means for reducing the threshold of angular-modulation receivers
EP0064819A1 (en) * 1981-04-28 1982-11-17 Oki Electric Industry Company, Limited An FM signal demodulation system
US4374335A (en) * 1980-05-19 1983-02-15 Precision Monolithics, Inc. Tuneable I.C. active integrator
EP0086838A1 (en) * 1981-08-31 1983-08-31 Oki Electric Industry Company, Limited High-sensitivity fm signal demodulation system
EP0086839A1 (en) * 1981-08-31 1983-08-31 Oki Electric Industry Company, Limited High-sensitivity fm demodulating system
GB2140235A (en) * 1983-05-19 1984-11-21 Ates Componenti Elettron Circuits for reducing noise in electromagnetic wave receivers
US4839542A (en) * 1984-08-21 1989-06-13 General Datacomm Industries, Inc. Active transconductance filter device
GB2222332A (en) * 1988-08-25 1990-02-28 Nec Corp Radio receiver receiving voice and data signals

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805091A (en) * 1972-06-15 1974-04-16 Arp Instr Frequency sensitive circuit employing variable transconductance circuit
US4356658A (en) * 1981-02-11 1982-11-02 Goldfarb Adolph E Multiple and varied motion stage apparatus for doll figure
US4356657A (en) * 1981-02-11 1982-11-02 Adolph E. Goldfarb Toy car wash apparatus and method
US4591805A (en) * 1984-05-30 1986-05-27 General Electric Company Adaptive bandwidth amplifier
DE3737581A1 (de) * 1987-11-05 1989-05-18 Grundig Emv Einrichtung zum automatischen anlegen der abgleichspannungen an die abstimmbaren schaltungselemente des zf-verstaerkers eines fernsehempfaengers
US5051628A (en) * 1990-01-02 1991-09-24 Motorola, Inc. Integrated filter circuit

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB491693A (en) * 1937-01-21 1938-09-07 Hazeltine Corp Improvements in variable selectivity radio receivers
GB856892A (en) * 1957-11-14 1960-12-21 Collins Radio Co Means for reducing the threshold of angular-modulation receivers
US4374335A (en) * 1980-05-19 1983-02-15 Precision Monolithics, Inc. Tuneable I.C. active integrator
EP0064819A1 (en) * 1981-04-28 1982-11-17 Oki Electric Industry Company, Limited An FM signal demodulation system
EP0086838A1 (en) * 1981-08-31 1983-08-31 Oki Electric Industry Company, Limited High-sensitivity fm signal demodulation system
EP0086839A1 (en) * 1981-08-31 1983-08-31 Oki Electric Industry Company, Limited High-sensitivity fm demodulating system
GB2140235A (en) * 1983-05-19 1984-11-21 Ates Componenti Elettron Circuits for reducing noise in electromagnetic wave receivers
US4839542A (en) * 1984-08-21 1989-06-13 General Datacomm Industries, Inc. Active transconductance filter device
GB2222332A (en) * 1988-08-25 1990-02-28 Nec Corp Radio receiver receiving voice and data signals

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1032979A2 (en) * 1997-10-29 2000-09-06 TELEFONAKTIEBOLAGET LM ERICSSON (publ) Arrangement and method relating to radio communication

Also Published As

Publication number Publication date
GB9212049D0 (en) 1992-08-12
DE4192545T (enrdf_load_stackoverflow) 1992-10-08
WO1992007422A1 (en) 1992-04-30
GB9503349D0 (en) 1995-04-12
BR9106178A (pt) 1993-03-16
GB2255461B (en) 1995-06-14
GB2255461A (en) 1992-11-04
AR246644A1 (es) 1994-08-31
JPH05503409A (ja) 1993-06-03
MX9101511A (es) 1992-06-05
CA2069639A1 (en) 1992-04-11

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)