Oscillators – Automatic frequency stabilization using a phase or frequency... – With reference oscillator or source
Patent
1998-12-29
2000-10-31
Mis, David
Oscillators
Automatic frequency stabilization using a phase or frequency...
With reference oscillator or source
331 17, 331 25, 327156, 327157, 348540, H03L 708, H03L 706, H03L 700
Patent
active
061408816
ABSTRACT:
A display apparatus for selecting a display mode, based on the horizontal and vertical synchronizing signals and an analog video signal supplied from a host with multiple display modes, includes a mode distinction circuit for generating first to third control signals according to a display mode received from the host, a clock signal generator for generating a pixel clock signal corresponding to the display mode in response to the first and second control signals and the horizontal synchronizing signal, a voltage controller for generating adjustment signals applied to the clock signal generator to adjust the phase and frequency of the pixel clock signal according to first/second voltages and the first/second control signals, and a switching circuit for supplying or cutting off the second control signal to the clock signal generator according to the third control signal being at a first level or a second level in response to the first voltage and the third control signal. The first and second control signals are respectively to adjust the phase and frequency of the pixel clock signal according to the display mode. The mode distinction circuit generates the third control signal at the second level upon generating the first control signal, and generates the third control signal at the first level upon generating the second control signal.
REFERENCES:
patent: 4988955 (1991-01-01), Horie
patent: 5151665 (1992-09-01), Wentzler
patent: 5304956 (1994-04-01), Egan
patent: 5459755 (1995-10-01), Iga et al.
patent: 5534821 (1996-07-01), Akiyama et al.
Bushnell Esq. Robert E.
Mis David
Samsung Electronics Co,. Ltd.
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