Amplifiers – Miscellaneous – Amplifier protection means
Patent
1980-01-17
1983-01-04
Mullins, James B.
Amplifiers
Miscellaneous
Amplifier protection means
330298, 330149, H03F 2100, H03F 126
Patent
active
043674437
ABSTRACT:
A multistage radio frequency (RF) signal power amplifier is described that utilizes microstrip transmission line techniques for realizing essentially all of the matching circuitry for each stage of amplification. The power amplifier includes a variable gain predriver, a driver amplifier and a pair of paralleled final amplifiers, all of which are intercoupled by microstrip coupling circuitry. A power detector senses the magnitude of the final amplifier output and provides a forward power signal having a magnitude proportional thereto. A power output regulator is responsive to the forward power signal for providing a drive signal for varying the gain of the predriver amplifier to maintain the magnitude of the final amplifier output at a preset magnitude. The RF signal power amplifier further includes spurious signal suppression circuitry coupled to the output of the driver amplifier and final amplifiers for suppressing spurious signals generated by regenerative modes of oscillation occurring therein. The spurious signal suppression circuitry includes a resistor coupled to a microstrip transmission line having a length such that the line is a relatively low impedance at the spurious signal frequencies and a high impedance at the RF signal frequency. Thus, the spurious signals are attenuated by the resistor, while the RF signal is essentially unaffected. The RF signal power amplifier embodying the present invention may be advantageously utilized in a radio communication system for amplifying signals to be transmitted by a base station radio.
REFERENCES:
patent: 3449680 (1969-06-01), Schilb
patent: 3471796 (1969-10-01), Wright
patent: 3652948 (1972-03-01), Fierstein et al.
patent: 3671878 (1972-06-01), Becker
patent: 3714597 (1973-01-01), Reynolds
Motorola Instruction Manual No. 68P81017E40, "Base and Repeater Stations", 1972.
Motorola Instruction Manual No. 68P81030E10, "Cell Site RF Power Amplifier", 1975.
P. C. Magnusson, "Transmission Lines and Wave Propagation", Chapter 4, Allyn & Bacon, 1965.
Motorola Instruction Manual No. 68P81042E10, "Base Site RF Power Amplifier", 1979.
Hull Thomas W.
Pagnamenta Antonio
Gillman James W.
Hackbart Rolland R.
Motorola Inc.
Mullins James B.
Wan Gene
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