Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Frequency or repetition rate conversion or control
Reexamination Certificate
2005-04-19
2005-04-19
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Frequency or repetition rate conversion or control
C327S113000
Reexamination Certificate
active
06882191
ABSTRACT:
A frequency multiplier circuit is provided that does not rely on filtering to remove unwanted harmonics and spurious content. In one implementation, a frequency doubler comprises a first rectifier doubler stage adapted to receive a first input signal having a first frequency and output a first rectified signal having multiple harmonics; a second rectifier doubler stage adapted to receive a second input signal having the first frequency and offset in phase from the first input signal and to output a second rectified signal, which has the multiple harmonics and is offset in phase from the first rectified signal; and a differential amplifier stage adapted to sum the first and second rectified signals to produce an output signal including a desired output harmonic having a frequency that is double the first frequency. The summing results in the substantial cancellation of unwanted output harmonics in the output signal.
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Fitch Even Tabin & Flannery
Le Dinh T.
M2 Networks, Inc.
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