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WO1997031465A3 - Frequency control in an fsk receiver - Google Patents

Frequency control in an fsk receiver Download PDF

Info

Publication number
WO1997031465A3
WO1997031465A3 PCT/GB1997/000478 GB9700478W WO9731465A3 WO 1997031465 A3 WO1997031465 A3 WO 1997031465A3 GB 9700478 W GB9700478 W GB 9700478W WO 9731465 A3 WO9731465 A3 WO 9731465A3
Authority
WO
WIPO (PCT)
Prior art keywords
signal
mixer
fsk
providing
output
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.)
Ceased
Application number
PCT/GB1997/000478
Other languages
French (fr)
Other versions
WO1997031465A2 (en
Inventor
Robert Edmund Todd
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.)
Cedardell Ltd
Original Assignee
Cedardell Ltd
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 Cedardell Ltd filed Critical Cedardell Ltd
Priority to AU18059/97A priority Critical patent/AU1805997A/en
Publication of WO1997031465A2 publication Critical patent/WO1997031465A2/en
Publication of WO1997031465A3 publication Critical patent/WO1997031465A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/14—Demodulator circuits; Receiver circuits
    • H04L27/144—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements
    • H04L27/152—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using controlled oscillators, e.g. PLL arrangements

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Superheterodyne Receivers (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

An RF receiver (1) comprises an antenna (2) for receiving radiated RF signals and for providing an FSK electrical signal. The receiver further comprises a first mixer (31) in which a signal from a local oscillator is mixed with an input signal from the FSK signal to provide an output signal. The mixer is controlled by local oscillator (32). The output from the first mixer is a version of the signal derived from the FSK signal at input (3). The second mixer (33) is controlled by clock signal and outputs a signal which is a frequency shifted version of the signal on output (3). The receiver further comprises detector circuit (36) for receiving a second signal and providing a third electrical signal having an amplitude representing an instantaneous logic level of the digital frequency modulating signal. The receiver further comprises the feedback resistor (12) providing a tuning voltage to the voltage controlled oscillator of the first mixer.
PCT/GB1997/000478 1996-02-21 1997-02-20 Frequency control in an fsk receiver Ceased WO1997031465A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU18059/97A AU1805997A (en) 1996-02-21 1997-02-20 Frequency control in an fsk receiver

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9603660.3 1996-02-21
GBGB9603660.3A GB9603660D0 (en) 1996-02-21 1996-02-21 Fm detection apparatus and method

Publications (2)

Publication Number Publication Date
WO1997031465A2 WO1997031465A2 (en) 1997-08-28
WO1997031465A3 true WO1997031465A3 (en) 1997-10-23

Family

ID=10789150

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/000478 Ceased WO1997031465A2 (en) 1996-02-21 1997-02-20 Frequency control in an fsk receiver

Country Status (3)

Country Link
AU (1) AU1805997A (en)
GB (1) GB9603660D0 (en)
WO (1) WO1997031465A2 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2482804A1 (en) * 1980-05-16 1981-11-20 Plessey Overseas RADIO RECEIVER WITH FREQUENCY MODULATION
GB2120052A (en) * 1982-04-30 1983-11-23 Philips Electronic Associated Receiver
GB2146876A (en) * 1983-09-14 1985-04-24 Plessey Co Plc FSK radio receiver
US4628518A (en) * 1981-08-20 1986-12-09 Plessey Overseas Limited Radio receiver
EP0527469A2 (en) * 1991-08-12 1993-02-17 Matsushita Electric Industrial Co., Ltd. FSK data receiving system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2482804A1 (en) * 1980-05-16 1981-11-20 Plessey Overseas RADIO RECEIVER WITH FREQUENCY MODULATION
US4628518A (en) * 1981-08-20 1986-12-09 Plessey Overseas Limited Radio receiver
GB2120052A (en) * 1982-04-30 1983-11-23 Philips Electronic Associated Receiver
GB2146876A (en) * 1983-09-14 1985-04-24 Plessey Co Plc FSK radio receiver
EP0527469A2 (en) * 1991-08-12 1993-02-17 Matsushita Electric Industrial Co., Ltd. FSK data receiving system

Also Published As

Publication number Publication date
AU1805997A (en) 1997-09-10
WO1997031465A2 (en) 1997-08-28
GB9603660D0 (en) 1996-04-17

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