HEC4750VF データシートの表示（PDF） - Philips Electronics

部品番号

コンポーネント説明

メーカー

HEC4750VF

Frequency synthesizer

Philips Electronics 

Philips Semiconductors

Frequency synthesizer

Product specification

HEF4750V

LSI

FUNCTIONAL DESCRIPTION

Phase comparator 1

Phase comparator 1 (PC1) is built around a SAMPLE and

HOLD circuit. A negative-going transition at the V-input

causes the hold capacitor (CA) to be discharged and after

a specified delay, caused by the Phase Modulator by

means of an internal V’ pulse, it produces a positive-going

ramp. A negative-going transition at the R-input terminates

the ramp. Capacitor CA holds the voltage that the ramp

has attained. Via an internal sampling switch this voltage

is transferred to CC and in turn buffered and made

available at output PC1.

If the ramp terminates before an R-input is present, an

internal end of ramp (EOR) signal is produced.

These actions are illustrated in Fig.3.

Fig.3 Waveforms associated with PC1.

The resultant phase characteristic is shown in Fig.4.

January 1995

5

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