Frequency synthesizer capable of obtaining signals in three...

Details Frequency synthesizer capable of obtaining signals in three... Frequency synthesizer capable of obtaining signals in three...

2005-11-15

2005-11-15

Tsang, Fan (Department: 2645)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S260000, C327S156000

Reexamination Certificate

active

06965759

ABSTRACT:
A frequency synthesizer includes a first oscillator that outputs a first oscillation signal. A first phase shifter outputs two first signals which are out of phase by 90°. A second oscillator outputs a second oscillation signal. A second phase shifter outputs two second signals which are out of phase by 90°. To a first mixer, one of the first signals and one of the second signals are input. To a second mixer, the other one of the first signals and the other one of the second signals are input. An adder adds combined outputs from the first and second mixers. A phase switching device changes the phase relationship between the two first signals or the two second signals input to the first mixer and the second signal. An input allowing/prohibiting switching device allows or prohibits the second signals from being input to the first and second mixers. The adder outputs one of a signal at the same frequency as that of the first oscillation signal, a signal at the sum frequency of the frequencies of the first oscillation signal and the second oscillation signal, and a signal at the difference frequency between the frequencies of the first oscillation signal and the second oscillation signal.

REFERENCES:
patent: 6178320 (2001-01-01), Richards et al.
patent: 6188289 (2001-02-01), Hyeon
patent: 6516184 (2003-02-01), Damgaard et al.
patent: 6625435 (2003-09-01), Ramesh
patent: 6768902 (2004-07-01), Kajita
patent: 9-148926 (1997-06-01), None

Affiliated with

Also associated with

Rating

Frequency synthesizer capable of obtaining signals in three... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Frequency synthesizer capable of obtaining signals in three..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency synthesizer capable of obtaining signals in three... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3473201