Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synthesizer
Reexamination Certificate
2007-02-13
2007-02-13
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synthesizer
C327S107000
Reexamination Certificate
active
10889122
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.
Le Dinh T.
NEC Corporation
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