Telecommunications – Transmitter – Carrier frequency stabilization
Reexamination Certificate
2005-11-08
2008-10-07
Nguyen, Tony T (Department: 2618)
Telecommunications
Transmitter
Carrier frequency stabilization
C455S182200, C455S180300, C455S192200, C375S344000
Reexamination Certificate
active
07433657
ABSTRACT:
A transmitter has a signal generator, an amplifier, a detection circuit, a comparison circuit, a loop filter, and an adjustable clock. The signal generator produces a signal. The signal is produced with a first frequency characteristic and contains frequency-related information. The detection circuit detects the first frequency-related characteristic and generates an associated signal in response. A comparison circuit compares the signal from the detection circuit and another signal. It outputs a signal associated with the difference between the two. A loop filter receives the output of the comparison circuit and generates a signal to the signal generator in. The loop filter is clocked at a second frequency by a signal from a clock circuit. The clock circuit can compare the first frequency and the second frequency, and can change the second frequency based upon a relationship between the two frequencies.
REFERENCES:
patent: 4489413 (1984-12-01), Richmond et al.
patent: 5982242 (1999-11-01), Jun et al.
patent: 6704554 (2004-03-01), Gerrits
Liang Paul Cheng-Po
Patel Rajesh D.
Matsushita Electric - Industrial Co., Ltd.
McDermott Will & Emery LLP
Nguyen Tony T
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