Clock derivation circuits

Details Clock derivation circuits Clock derivation circuits

1980-03-18

1985-07-23

Miller, Stanley D.

Pulse or digital communications

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328 63, 328 72, 328109, 328110, 307517, 307518, 375 95, 375 87, 375120, H04L 700, H03K 5156

Patent

active

045312230

ABSTRACT:
This invention relates to a clock deriving system as described below. At a base radio station, data is converted to a Manchester code and modulated into an FM, PM or AM radio wave. This radio wave is received by the antenna of a radio receiving apparatus and amplified and demodulated by a radio receiver of the apparatus into the base band signal of the Manchester code form. This signal is amplified and sliced by a limiter amplifier and then supplied to a clock derivation circuit where a useful clock component is derived. This clock component is passed through a filter of a necessary clock frequency band, from which clock information is produced. This clock information is applied to a phase detector where the output clock signal from a digital PLL and the input clock information are compared in phase, that is, detection is made of whether the former is ahead of or behind the latter. If the former signal is ahead of the latter, the phase detector produces "1", whereas if the former is behind the latter, the detector produces "0". As a result, the digital PLL adjusts the phase of the incorporated clock oscillator therein, thereby deriving the clock signal of the input data.

REFERENCES:
patent: 3624528 (1971-11-01), Adlhock
patent: 3767860 (1973-10-01), Brown
patent: 4029905 (1977-06-01), Abraham

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