GB1530602A - Demodulator for fm signals - Google Patents

Demodulator for fm signals

Info

Publication number
GB1530602A
GB1530602A GB4198875A GB4198875A GB1530602A GB 1530602 A GB1530602 A GB 1530602A GB 4198875 A GB4198875 A GB 4198875A GB 4198875 A GB4198875 A GB 4198875A GB 1530602 A GB1530602 A GB 1530602A
Authority
GB
United Kingdom
Prior art keywords
signals
local oscillator
oscillator
output
oct
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.)
Expired
Application number
GB4198875A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB4198875A priority Critical patent/GB1530602A/en
Priority to DE19762645950 priority patent/DE2645950C2/en
Priority to ES452383A priority patent/ES452383A1/en
Publication of GB1530602A publication Critical patent/GB1530602A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/006—Demodulation of angle-, frequency- or phase- modulated oscillations by sampling the oscillations and further processing the samples, e.g. by computing techniques
    • 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
    • H03D3/009—Compensating quadrature phase or amplitude imbalances
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
    • H03D2200/0001—Circuit elements of demodulators
    • H03D2200/0025—Gain control circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
    • H03D2200/0001—Circuit elements of demodulators
    • H03D2200/0031—PLL circuits with quadrature locking, e.g. a Costas loop
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
    • H03D2200/0041—Functional aspects of demodulators
    • H03D2200/0082—Quadrature arrangements
    • 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
    • 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
    • H03D7/165—Multiple-frequency-changing at least two frequency changers being located in different paths, e.g. in two paths with carriers in quadrature

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

1530602 FM demodulators STANDARD TELEPHONES & CABLES Ltd 4 Oct 1976 [14 Oct 1975] 41988/75 Heading H3A An FM demodulator comprises mixers M1, M2 for mixing the received FM signal with local oscillator LO signals applied in quadrature, the mixer outputs being applied to respective differentiators D1, D2 via associated low-pass filters LP1, LP2 and amplifiers Gl, G2, providing a constant level output, multipliers M3, M4 coupled to the input of a respective differentiator and the output of the corresponding one of the other differentiator and a circuit DA for obtaining the difference in the multiplier outputs as the demodulated signal. The demodulated output may be used to control the local oscillator LO. One of the input signals of each multiplier M3, M4 may be applied via a pulsewidth modulator. The alternative embodiment of Fig. 2 (not shown), formed as an integrated circuit includes a first oscillator locked to an external synthesizer and a second oscillator phase locked to the first for providing the quadrature signals to the mixers M1, M2. Fig. 3 (not shown) relates to a single local oscillator supplying a first amplifier directly and a second amplifier via a 90 degree phase shift. For handling FSK signals, the circuit may incorporate special filters.
GB4198875A 1975-10-14 1975-10-14 Demodulator for fm signals Expired GB1530602A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB4198875A GB1530602A (en) 1975-10-14 1975-10-14 Demodulator for fm signals
DE19762645950 DE2645950C2 (en) 1975-10-14 1976-10-12 Receiver for a frequency-modulated RF input signal
ES452383A ES452383A1 (en) 1975-10-14 1976-10-14 Demodulator for fm signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4198875A GB1530602A (en) 1975-10-14 1975-10-14 Demodulator for fm signals

Publications (1)

Publication Number Publication Date
GB1530602A true GB1530602A (en) 1978-11-01

Family

ID=10422311

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4198875A Expired GB1530602A (en) 1975-10-14 1975-10-14 Demodulator for fm signals

Country Status (3)

Country Link
DE (1) DE2645950C2 (en)
ES (1) ES452383A1 (en)
GB (1) GB1530602A (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0059000A1 (en) * 1981-02-20 1982-09-01 Philips Electronics Uk Limited A direct modulation FM demodulator
DE3238194A1 (en) * 1981-10-26 1983-05-05 N.V. Philips' Gloeilampenfabrieken, 5621 Eindhoven FM DATA RECEIVER WITH DIRECT MODULATION
GB2137836A (en) * 1983-04-06 1984-10-10 Multitone Electronics Plc FM Demodulators
GB2143386A (en) * 1983-07-14 1985-02-06 Standard Telephones Cables Ltd Radio receiver
GB2148669A (en) * 1983-10-21 1985-05-30 Philips Electronic Associated Data receiver
EP0147120A2 (en) * 1983-12-12 1985-07-03 International Standard Electric Corporation A zero if demodulator and method of demodulation
US4580101A (en) * 1983-04-06 1986-04-01 Multitone Electronics Plc FM demodulators with local oscillator frequency control circuits
GB2170368A (en) * 1985-01-25 1986-07-30 Nec Corp Receiver for mobile communication systems
DE3613994A1 (en) * 1986-04-25 1987-10-29 Schrack Elektronik Ag Circuit arrangement for demodulating frequency-modulated signals
US4718113A (en) * 1985-05-08 1988-01-05 Alcatel Nv Zero-IF receiver wih feedback loop for suppressing interfering signals
US4731796A (en) * 1984-10-25 1988-03-15 Stc, Plc Multi-mode radio transceiver
US4811425A (en) * 1987-01-09 1989-03-07 Itt Avionics, A Division Of Itt Corporation Apparatus for reducing the effects of local oscillator leakage in mixers employed in zero IF receivers
US5414383A (en) * 1993-04-08 1995-05-09 U.S. Philips Corporation Four quadrant multiplier circuit and a receiver including such a circuit
WO1999046864A1 (en) * 1998-03-11 1999-09-16 Siemens Aktiengesellschaft Integrable radio receiver circuit for frequency-modulated digital signals
WO2001003284A1 (en) * 1999-06-30 2001-01-11 Infineon Technologies Ag Device and method for demodulating frequency-modulated signals

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1517121A (en) * 1977-01-13 1978-07-12 Standard Telephones Cables Ltd Radio receiver for fsk signals
GB1556087A (en) * 1977-12-01 1979-11-21 Standard Telephones Cables Ltd Single channel duplex radio system
GB2052216B (en) * 1979-06-08 1983-09-21 Plessey Co Ltd Duplex transceivers
DE3007907A1 (en) * 1980-03-01 1981-09-17 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt DIGITAL RECEIVER
GB2083977B (en) * 1980-08-26 1984-08-22 Standard Telephones Cables Ltd Single channel duplex radio system
US4476585A (en) * 1982-01-25 1984-10-09 International Telephone And Telegraph Corporation Baseband demodulator for FM signals
JPS58133005A (en) * 1982-02-02 1983-08-08 Nec Corp Fm demodulator
DE3412190C2 (en) * 1984-04-02 1986-12-18 Telefunken electronic GmbH, 7100 Heilbronn Integrable receiver circuit
DE3412191A1 (en) * 1984-04-02 1985-10-31 Telefunken electronic GmbH, 7100 Heilbronn Integrable receiver circuit
GB2211968A (en) * 1987-11-04 1989-07-12 Philips Nv Divider circuit e.g. for normalising
DE3815055A1 (en) * 1988-05-04 1989-11-16 Standard Elektrik Lorenz Ag SQUARE RECEIVER
ES2079397T3 (en) * 1989-06-09 1996-01-16 Telefunken Microelectron DISPOSITION OF A CIRCUIT FOR THE CONVERSION OF FREQUENCIES.
DE19738363C2 (en) * 1997-09-02 2000-11-09 Siemens Ag Receiver for mobile radio systems
CN1988397B (en) * 2005-12-21 2011-05-25 上海贝岭股份有限公司 Frequency modulation receiver and its demodulation method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1616312B2 (en) * 1968-01-25 1973-10-18 Helmut 8000 Muenchen Spieler Single sideband transmission device according to the third method
DE2358288A1 (en) * 1973-11-22 1975-06-05 Standard Elektrik Lorenz Ag RECEIVER FOR FREQUENCY-MODULATED HF SIGNALS

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0059000A1 (en) * 1981-02-20 1982-09-01 Philips Electronics Uk Limited A direct modulation FM demodulator
DE3238194A1 (en) * 1981-10-26 1983-05-05 N.V. Philips' Gloeilampenfabrieken, 5621 Eindhoven FM DATA RECEIVER WITH DIRECT MODULATION
US4580101A (en) * 1983-04-06 1986-04-01 Multitone Electronics Plc FM demodulators with local oscillator frequency control circuits
GB2137836A (en) * 1983-04-06 1984-10-10 Multitone Electronics Plc FM Demodulators
GB2143386A (en) * 1983-07-14 1985-02-06 Standard Telephones Cables Ltd Radio receiver
GB2148669A (en) * 1983-10-21 1985-05-30 Philips Electronic Associated Data receiver
EP0147120A3 (en) * 1983-12-12 1987-04-22 International Standard Electric Corporation A zero if demodulator and method of demodulation
EP0147120A2 (en) * 1983-12-12 1985-07-03 International Standard Electric Corporation A zero if demodulator and method of demodulation
US4731796A (en) * 1984-10-25 1988-03-15 Stc, Plc Multi-mode radio transceiver
GB2170368A (en) * 1985-01-25 1986-07-30 Nec Corp Receiver for mobile communication systems
US4776039A (en) * 1985-01-25 1988-10-04 Nec Corporation Receiver for mobile communication systems
GB2170368B (en) * 1985-01-25 1989-07-19 Nec Corp Receiver for mobile communication systems
US4718113A (en) * 1985-05-08 1988-01-05 Alcatel Nv Zero-IF receiver wih feedback loop for suppressing interfering signals
DE3613994A1 (en) * 1986-04-25 1987-10-29 Schrack Elektronik Ag Circuit arrangement for demodulating frequency-modulated signals
US4811425A (en) * 1987-01-09 1989-03-07 Itt Avionics, A Division Of Itt Corporation Apparatus for reducing the effects of local oscillator leakage in mixers employed in zero IF receivers
US5414383A (en) * 1993-04-08 1995-05-09 U.S. Philips Corporation Four quadrant multiplier circuit and a receiver including such a circuit
WO1999046864A1 (en) * 1998-03-11 1999-09-16 Siemens Aktiengesellschaft Integrable radio receiver circuit for frequency-modulated digital signals
US6539066B1 (en) 1998-03-11 2003-03-25 Infineon Technologies Ag Integrable radio receiver circuit for frequency-modulated digital signals
WO2001003284A1 (en) * 1999-06-30 2001-01-11 Infineon Technologies Ag Device and method for demodulating frequency-modulated signals

Also Published As

Publication number Publication date
DE2645950A1 (en) 1977-04-28
DE2645950C2 (en) 1985-09-05
ES452383A1 (en) 1978-01-01

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee