Synthesizer

Details Synthesizer Synthesizer

2006-11-27

2009-02-24

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synthesizer

C327S107000, C327S163000

Reexamination Certificate

active

07495481

ABSTRACT:
A synthesizer that has a phase detector8and a charge pump circuit9for injecting an electric charge, or pulling it out that corresponded to a frequency difference of an input, a low-pass filter11for converting this electric charge into a voltage, a voltage control oscillator (VCO)13for changing an output frequency for this input voltage, a divider14for dividing the frequency of the input, and a voltage holding circuit10for holding the input voltage for a plurality of output frequencies of the VCO. A holding voltage of the voltage holding circuit10is switched with a switch12,and the frequency of an output clock signal3is switched.

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RF Microelectronics, Chapter 8 Frequency Synthesizers, p. 252, Fig. 8.8, 1998.
RF Microelectronics, Section 7.9 Single-Sideband Generation, p. 244, Fig. 7.46, 1998.
RF Microelectronics, Section 8.3 RF Synthesizer Architectures, p. 285 to 289, Fig. 8.47, 1998.

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