Circuit synchronized by a signal at a deflection frequency

Details Circuit synchronized by a signal at a deflection frequency Circuit synchronized by a signal at a deflection frequency

1985-12-24

1987-01-06

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358158, 358159, H01J 2970, H01J 2976

Patent

active

046349391

ABSTRACT:
A phase-lock loop circuit of a video display apparatus is synchronized by a horizontal synchronizing input signal. The phase-lock loop circuit includes a frequency-to-voltage converter that is responsive to the synchronizing input signal for generating a control voltage indicative of the frequency of the synchronizing input signal. A voltage-to-current converter responsive to the control voltage generates a control current that is indicative of the frequency of the input signal. The control current varies the free running frequency of a controlled oscillator of the phase-lock loop circuit such that the free running frequency of the oscillator is directly related to the frequency of the input signal. The phase of the output signal of the oscillator is controlled by a second control current that is indicative of the phase difference between the oscillator output signal and the synchronizing input signal. When the frequency of the input signal is lower than a predetermined frequency, the first control current is at a level that causes the free running frequency to be above a predetermined minimum frequency.

REFERENCES:
patent: 3074027 (1963-01-01), Rout
patent: 4047223 (1977-09-01), Hofmann
patent: 4467359 (1984-08-01), Hosoya
An application note No. 162 entitled LM2907 Tachometer/Speed Switch Building Block Applications in the name of Dave Long from National Semiconductor Corporation, dated Jun. 1976.
A data sheet for integrated circuit (IC) NE/SE5560, entitled Switched-Mode Power Supply Control Circuit, by Analog Division of Signetics Corporation, dated Jun. 1983.
A data sheet for IC TDA2595, entitled Horizontal Combination, appearing in pp. 3-737 to 3-745 of "Linear LSI Europroducts Data Manual", dated 1984.
A report entitled Sync Processor TDA 2595, dated 11/8/84.

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