Plural synthesizer controlling system for personal handyphone sy

Details Plural synthesizer controlling system for personal handyphone sy Plural synthesizer controlling system for personal handyphone sy

1999-05-10

2000-10-31

Ghebretinsae, Temesghen

Pulse or digital communications

Transceivers

455 73, 455 76, H04B 138

Patent

active

061413755

ABSTRACT:
A modem IC controls latch enable terminals LE1 and LE2 through which PLL frequency synthesizer IC1 and IC2 control writing of frequency set data, makes the write timing different between the PLL frequency synthesizer ICs to allow writing of the frequency set data into two PLL frequency synthesizer ICs to be performed through the same control line, and produces a control signal to latch enable terminal LE2, which-controls writing of the frequency sent data into PLL frequency synthesizer IC2, from the other control signal by using an invertor and a NAND circuit.

REFERENCES:
patent: 5471652 (1995-11-01), Hulkko
patent: 5884200 (1999-03-01), Yamane et al.

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