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GB1462408A - Circuit for comparing two electrical waveforms - Google Patents

Circuit for comparing two electrical waveforms

Info

Publication number
GB1462408A
GB1462408A GB3313974A GB3313974A GB1462408A GB 1462408 A GB1462408 A GB 1462408A GB 3313974 A GB3313974 A GB 3313974A GB 3313974 A GB3313974 A GB 3313974A GB 1462408 A GB1462408 A GB 1462408A
Authority
GB
United Kingdom
Prior art keywords
phase
signal
frequency
stable
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.)
Expired
Application number
GB3313974A
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.)
Philips Components Ltd
Original Assignee
Mullard 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 Mullard Ltd filed Critical Mullard Ltd
Priority to GB3313974A priority Critical patent/GB1462408A/en
Publication of GB1462408A publication Critical patent/GB1462408A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D13/00—Circuits for comparing the phase or frequency of two mutually-independent oscillations
    • H03D13/003—Circuits for comparing the phase or frequency of two mutually-independent oscillations in which both oscillations are converted by logic means into pulses which are applied to filtering or integrating means

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manipulation Of Pulses (AREA)

Abstract

1462408 Phase and frequency detectors; digital frequency meters MULLARD Ltd 26 July 1974 33139/74 Headings H3A and H3H Apparatus for detecting the phase and/or frequency difference between the input signals A, B comprises a phase comparator, e.g. bistable 8 which provides an output E whose magnitude depends on the difference and means e.g. 9, 6 for reversing the phase of either one of the input signals if two consecutive similar transitions of one waveform occur without an intervening similar transition of the other. If the two signals are at the same frequency, bistable 8 is set by a positive going transition of one input, and reset by a positive going transition of the other. In this condition two further bi-stables 9, 10 provide "0" levels at their outputs and the two signals A, B are applied to bistable 8 via EXCLUSIVE-OR gates 6, 7 without inversion. If the frequency of signal A is higher than that of signal B, then a second positive transition of signal A will eventually occur before bi-stable 8 has been reset by signal B, and bi-stable 9 will be switched to give a "1" output which causes gate 6 to invert subsequent input pulses at A. This switching repeats each time the phase difference increases by #. Similarly if B is higher the phase of signal B is inverted by 10 and 7. The output E from bi-stable 8 may be fed to a lowpass filter 11 to give an analogue output at 4, or the outputs G, H from bi-stable 9, 10 may be connected to an up/down counter which indicates the frequency difference.
GB3313974A 1974-07-26 1974-07-26 Circuit for comparing two electrical waveforms Expired GB1462408A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3313974A GB1462408A (en) 1974-07-26 1974-07-26 Circuit for comparing two electrical waveforms

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3313974A GB1462408A (en) 1974-07-26 1974-07-26 Circuit for comparing two electrical waveforms

Publications (1)

Publication Number Publication Date
GB1462408A true GB1462408A (en) 1977-01-26

Family

ID=10349052

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3313974A Expired GB1462408A (en) 1974-07-26 1974-07-26 Circuit for comparing two electrical waveforms

Country Status (1)

Country Link
GB (1) GB1462408A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2397097A1 (en) * 1977-07-05 1979-02-02 Gen Electric CIRCUIT FOR DETECTION OF THE RELATIONSHIP BETWEEN THE FREQUENCIES OF TWO SIGNALS
DE3130036A1 (en) * 1981-07-30 1983-02-17 Robert Bosch Gmbh, 7000 Stuttgart Frequency-sensitive edge-triggered phase detector
EP0246135A1 (en) * 1986-05-13 1987-11-19 Thomson-Csf Phase frequency detector and its use in a phase-locked loop
EP0323124A2 (en) * 1987-12-24 1989-07-05 Fujitsu Limited Digital phase comparing circuit
US6417707B1 (en) 1997-07-07 2002-07-09 Toric Limited Noise reduction circuits

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2397097A1 (en) * 1977-07-05 1979-02-02 Gen Electric CIRCUIT FOR DETECTION OF THE RELATIONSHIP BETWEEN THE FREQUENCIES OF TWO SIGNALS
DE3130036A1 (en) * 1981-07-30 1983-02-17 Robert Bosch Gmbh, 7000 Stuttgart Frequency-sensitive edge-triggered phase detector
EP0246135A1 (en) * 1986-05-13 1987-11-19 Thomson-Csf Phase frequency detector and its use in a phase-locked loop
FR2598869A1 (en) * 1986-05-13 1987-11-20 Thomson Csf PHASE AND FREQUENCY DETECTOR AND ITS USE IN A PHASE LOCKED LOOP
US4792767A (en) * 1986-05-13 1988-12-20 Thomson-Csf Phase and frequency detector and use of this detector in a phase-lock loop
EP0323124A2 (en) * 1987-12-24 1989-07-05 Fujitsu Limited Digital phase comparing circuit
EP0323124A3 (en) * 1987-12-24 1989-11-29 Fujitsu Limited Digital phase comparing circuit
US4928026A (en) * 1987-12-24 1990-05-22 Fujitsu Limited Digital phase comparing circuit
US6417707B1 (en) 1997-07-07 2002-07-09 Toric Limited Noise reduction circuits

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee