Circuit and method for altering the frequency of a signal

Details Circuit and method for altering the frequency of a signal Circuit and method for altering the frequency of a signal

1999-10-22

2001-07-24

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Frequency or repetition rate conversion or control

C327S100000, C327S119000

Reexamination Certificate

active

06265917

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates, in general, to circuits and, more particularly, to both a circuit and method for altering the frequency of an input signal while generating an output signal with a power level that is substantially independent of the power level of the input signal.
BACKGROUND OF THE INVENTION
Some electronic devices require two different frequencies that are related to each other by approximately a 2:1 ratio. For example, a dual-band cellular telephone may operate at both 800 megahertz (MHz) and at 1900 MHz. Past means and methods of producing the two frequencies have suffered from several drawbacks. For example, the use of two different frequency generators adds to the size and to the cost of the product. Using one frequency generator coupled to a frequency-doubling circuit is a way around that limitation. However, past frequency doubling circuits suffer from a multitude of drawbacks.
Thus, it would be advantageous to produce a doubled frequency that does not require many external components and that has an output level substantially independent of the input level.


REFERENCES:
patent: 4040075 (1977-08-01), Nakamura et al.
patent: 4052626 (1977-10-01), Tuma et al.

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