Transmission circuit

Details Transmission circuit Transmission circuit

2006-08-15

2006-08-15

Vuong, Quochien B. (Department: 2618)

Telecommunications

Transmitter

Amplitude modulation

C455S110000, C455S127200, C455S574000, C375S298000, C375S300000, C375S302000

Reexamination Certificate

active

07092683

ABSTRACT:
A transmission circuit includes: a modulated signal generator for outputting a modulated signal; an envelope detector for outputting an amplitude modulated voltage; an amplitude roll-off LPF for attenuating the amplitude modulated voltage by using a damping property represented by an exponential function in which an argument is exponentially proportional to a frequency; a power-supply-voltage generator for generating a power supply voltage in accordance with an amplitude value of the amplitude modulated voltage; a phase detector for outputting a phase modulated signal; a phase roll-off LPF for attenuating the phase modulated signal by using a damping property represented by an exponential function in which an argument is exponentially proportional to an offset frequency with respect to a center frequency; and an RF power amplifier.

REFERENCES:
patent: 3662290 (1972-05-01), Elliott
patent: 4592073 (1986-05-01), Watanabe
patent: 5093637 (1992-03-01), Isota et al.
patent: 5193223 (1993-03-01), Walczak et al.
patent: 6256482 (2001-07-01), Raab
patent: 7010280 (2006-03-01), Wilson
patent: 3-34709 (1991-02-01), None
patent: P2001-320246 (2001-11-01), None

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