Amplifiers – With semiconductor amplifying device – Including distributed parameter-type coupling
Patent
1980-01-17
1982-09-21
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including distributed parameter-type coupling
333 33, H03F 304
Patent
active
043509584
ABSTRACT:
Impedance matching circuitry is described that utilizes a plurality of series coupled microstrip transmission lines of different characteristic impedances for matching a radio frequency (RF) signal power amplifier to a predetermined output impedance, such as, for example, 50 ohms. Each of the microstrip transmission lines are successively coupled to the relatively low impedance output of a transistor of the power amplifier that is desired to be matched to the predetermined output impedance. Each of the successively coupled microstrip transmission lines has a greater characteristic impedance than the previously coupled microstrip transmission line for achieving the desired impedance match. The series coupled microstrip transmission lines not only match the power amplifier transistor to the predetermined output impedance, but also suppress regenerative oscillations which may occur when the power amplifier transistor is subjected to impedance mismatches. The inventive impedance matching circuitry may be advantageously utilized in the RF signal power amplifier of a base station radio in a mobile radio communication system.
REFERENCES:
patent: 3419813 (1968-12-01), Kamnitsis
patent: 4013974 (1977-03-01), Quine
Kalinikos, "Wideband Transistorized Power Amplifier of the Microwave Band", Instru. & Exp. Tech., vol. 20, No. 1, PT2, Jan.-Feb. 1977, pp. 161-162.
Gillman James W.
Hackbart Rolland R.
Motorola Inc.
Mullins James B.
LandOfFree
Impedance matching circuitry for radio frequency signal power am does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Impedance matching circuitry for radio frequency signal power am, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Impedance matching circuitry for radio frequency signal power am will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2078243