Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1994-03-15
1995-05-30
Mullins, James B.
Amplifiers
Hum or noise or distortion bucking introduced into signal...
330129, 330275, 330285, 330136, 455126, 455127, H03F 132, H03G 330
Patent
active
054205360
ABSTRACT:
A linearized power amplifier is provided which comprises a non-linear radio frequency (RF) power amplifier, a linearization circuit such as a Cartesian Feedback circuit, an RF feedback circuit; an IF feedback circuit; or a feedforward circuit, and a dynamic bias modulation circuit for modulating an operating voltage of the amplifier. The dynamic bias modulation means includes an envelope determining circuit, signal processing circuits in which predetermined data or a simplified transfer function determined from measured characteristics of the amplifier is stored and used to produce power bias and/or base or gate bias signals, and driver circuits for modulating the power supply voltage and/or base or gate bias voltage of the RF amplifier in response to the bias signals. The dynamic bias modulation may be used with a BJT-based, and FET-based or any other type of RF power amplifier. With the right combination of power supply and base or gate bias modulation the efficiency of the RF amplifier can be maximised for a given output power, and the combination of linearization means and high level power supply and/or base or gate bias modulation gives the benefits of improved spectral control and intermodulation distortion reduction coupled with high efficiency.
REFERENCES:
patent: 4546326 (1985-10-01), Van Uffelen et al.
patent: 5101173 (1992-03-01), DiPiazza et al.
patent: 5142240 (1992-08-01), Isota et al.
Briffa Mark A.
Faulkner Michael
Mullins James B.
Victoria University of Technology
LandOfFree
Linearized power amplifier does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Linearized power amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Linearized power amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-365094