Communications signal amplifiers having independent power...

Telecommunications – Transmitter – Power control – power supply – or bias voltage supply

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C455S108000, C330S010000, C330S136000

Reexamination Certificate

active

07035604

ABSTRACT:
The present invention, generally speaking, provides methods and apparatus for producing an amplitude modulated communications signal, in which a constant-envelope carrier signal is modified in response to a power control signal to produce a modified constant-envelope carrier signal. The modified constant-envelope carrier signal is amplified in response to an amplitude modulation signal to produce a communications signal having amplitude modulation and having an average output power proportional to a signal level of the modified constant-envelope carrier signal. This manner of operation allows wide dynamic range of average output power to be achieved. Because amplitude modulation is applied after amplitude varying circuitry used to produce the modified constant-envelope carrier signal, the amplitude modulation is unaffected by possible non-linearities of such circuitry. In accordance with another aspect of the invention, operation in the foregoing manner at comparatively low average output power levels is combined with switch mode operation at comparatively high average output power levels, enabling high overall efficiency to be achieved. Hence, the disclosed modulator and amplifier combination, in addition to supporting very low power signals, also supports high power signals.

REFERENCES:
patent: 5239275 (1993-08-01), Leitch
patent: 5251331 (1993-10-01), Schwent et al.
patent: 6043707 (2000-03-01), Budnik
patent: 6069525 (2000-05-01), Sevic et al.
patent: 6256482 (2001-07-01), Raab
patent: 6295442 (2001-09-01), Camp et al.
patent: 6529716 (2003-03-01), Edison et al.
International Search Report for Application No. PCT/US02/11776, dated Nov. 20, 2003.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Communications signal amplifiers having independent power... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Communications signal amplifiers having independent power..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Communications signal amplifiers having independent power... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3606724

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.