GB1424253A - Delay-locked variable oscillator - Google Patents

Delay-locked variable oscillator

Info

Publication number
GB1424253A
GB1424253A GB4883173A GB4883173A GB1424253A GB 1424253 A GB1424253 A GB 1424253A GB 4883173 A GB4883173 A GB 4883173A GB 4883173 A GB4883173 A GB 4883173A GB 1424253 A GB1424253 A GB 1424253A
Authority
GB
United Kingdom
Prior art keywords
phase
oscillator
phase detector
frequency
vco
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
GB4883173A
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 GB4883173A priority Critical patent/GB1424253A/en
Publication of GB1424253A publication Critical patent/GB1424253A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/44—Colour synchronisation
    • H04N9/455—Generation of colour burst signals; Insertion of colour burst signals in colour picture signals or separation of colour burst signals from colour picture signals
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/02—Automatic control of frequency or phase; Synchronisation using a frequency discriminator comprising a passive frequency-determining element

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

1424253 Automatic frequency control MULLARD Ltd 19 Oct 1973 48831/73 Heading H3A A continuously tuned locked oscillator system comprises a voltage oscillator VCO having its output connected to a delay line DL, one end of which is connected to one input of a phase detector and phase shifting means PS connected between the other end of the delay line and the other input of the phase detector, the output from the phase detector being connected to control the VCO. The oscillator control signal may be combined with a reference voltage VR which can be adjusted to give coarse frequency control. Fine frequency control is provided by varying the phase shifter PS. The phase shifter comprises a fixed phase shift device PS<SP>1</SP> giving four quadrature outputs which are connected to a complex capacitor unit. This unit has two sets of fixed vanes AA<SP>1</SP> and BB<SP>1</SP> which are 90 degrees offset and two sets of movable vanes C, D which are ganged together in phase, Fig. 2 (not shown). Alternatively a complex variable inductor may be used. In one modification, Fig. 5 (not shown), the reference voltage (VR<SP>1</SP>) and the voltage from the phase detector are fed to the oscillator as alternatives via a switch. (S1), a capacitor C1) providing a memory. In a modification the output from the VCO may be frequency changed by a mixer, Fig. 7 (not shown), or by a divider. In an alternative form, Fig. 6, the delay D and phase shifter PS are in the same path from the VCO to the phase detector PD, and both paths include respective NAND gates G1, G2 which are enabled by a frequency limit sensing arrangement comprising a frequency discriminator FV and threshold circuit K1, K2. If the oscillator frequency lies within limits set by reference voltages Œ#, both gates are enabled, and the system operates as in the previous embodiments. If the signal passes outside the limits, one or other of the gates G1, G2 is inhibited and the phase detector PD produces a maximum output to cause a rapid return to within limits.
GB4883173A 1973-10-19 1973-10-19 Delay-locked variable oscillator Expired GB1424253A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4883173A GB1424253A (en) 1973-10-19 1973-10-19 Delay-locked variable oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4883173A GB1424253A (en) 1973-10-19 1973-10-19 Delay-locked variable oscillator

Publications (1)

Publication Number Publication Date
GB1424253A true GB1424253A (en) 1976-02-11

Family

ID=10450080

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4883173A Expired GB1424253A (en) 1973-10-19 1973-10-19 Delay-locked variable oscillator

Country Status (1)

Country Link
GB (1) GB1424253A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2415387A1 (en) * 1978-01-18 1979-08-17 Daumas Jean Stabilised frequency phase loop oscillator - uses analogue or digital delay line to produce phase difference between two signals
US4510463A (en) * 1983-04-22 1985-04-09 Raytheon Company Automatic gain controlled frequency discriminator for use in a phase locked loop
US4871981A (en) * 1988-11-21 1989-10-03 E-Systems, Inc. Fast hopping microwave frequency synthesizer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2415387A1 (en) * 1978-01-18 1979-08-17 Daumas Jean Stabilised frequency phase loop oscillator - uses analogue or digital delay line to produce phase difference between two signals
US4510463A (en) * 1983-04-22 1985-04-09 Raytheon Company Automatic gain controlled frequency discriminator for use in a phase locked loop
US4871981A (en) * 1988-11-21 1989-10-03 E-Systems, Inc. Fast hopping microwave frequency synthesizer

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Legal Events

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