H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/88
H04N 5/04 (2006.01) H04N 5/12 (2006.01)
Patent
CA 1222559
AUTO RANGE HORIZONTAL AUTOMATIC PHASE CONTROL ABSTRACT OF THE DISCLOSURE A circuit for phase locking the flyback pulse to a reference signal. A phase detector receives the flyback pulse (to be phase locked) and receives the ref- erence signal. It outputs an error signal to a control circuit including first and second differential amplifiers having differing operational characteristics, one being linear in a narrower range than the other. The differential amplifier having the larger linearity range provides control signals to a coarse delay adjust circuit in the form of a programmable divider which also receives clock pulses at a high multiple of the horizontal frequency fH. The output of the coarse delay adjust circuit is applied to a fine delay adjust circuit responsively connected to the output of the first differential amplifier, which is linear over the narrower range. The output of the fine delay adjust circuit is coupled to the horizontal system. Large changes in the phase of the flyback signal are achieved by recognizing large deviations in the wider range differential amplifier and causing the coarse delay adjust circuit to make a relatively large adjustment in the phase of the output signals thereof. Thereafter, fine adjustments are made by the fine delay adjustment circuit in response to control signals from the narrower range differential amplifier.
443900
Lee Ronald B.
Srivastava Gopal K.
Macrae & Co.
Zenith Radio Corporation
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