1
Hilmer I Swanson: Amplitude modulation using digitally selected carrier amplifiers. Harris Corporation, Yount & Tarolli, April 1, 1986: US04580111 (151 worldwide citation)

An amplitude modulator (10) is disclosed which generates an amplitude modulated carrier signal by selectively combining varying numbers of other carrier signals. A circuit (20) is included which provides plural carrier signals of like frequency and phase where the number of carrier signals being pro ...


2
Hilmer I Swanson: Amplifier employing digital modulator circuit. Harris Corporation, Yount & Tarolli, September 6, 1983: US04403197 (39 worldwide citation)

An amplifier (FIGS. 1-3) is disclosed for amplifying an amplitude and frequency varying input signal. The amplifier includes a circuit (24, 100) responsive to the input signal to provide a digital representation thereof. In addition, a plurality of signal sources (30-36) are provided which each prov ...


3
Hilmer I Swanson: Polyphase PDM amplifier. Harris Corporation, August 14, 1979: US04164714 (37 worldwide citation)

A system wherein input signals are pulse duration modulated to provide a plurality of pulse trains having a predetermined phase relation therebetween. The plurality of pulse trains control the operation of separate switching elements. The output of the switching elements are summed and filtered to p ...


4
Hilmer I Swanson: RF power amplifier system having improved distortion reduction. Harris Corporation, Tarolli Sundheim & Covell, July 21, 1992: US05132637 (20 worldwide citation)

An RF power amplifier system is provided having improved distortion reduction. This system includes a plurality of actuatable RF power amplifiers, each connected to a DC voltage source and each having an input circuit for when actuated receiving and amplifying an RF drive signal and each having an o ...


5
Hilmer I Swanson: Phase modulation compensated amplitude modulator using digitally selected amplifiers. Harris Corporation, Tarolli Sundheim & Covell, August 28, 1990: US04952890 (18 worldwide citation)

An RF amplitude modulated amplifier system is presented incorporating a plurality of RF amplifiers which are compensated for unwanted phase modulation. The system includes a common RF driver for supplying a common RF driver signal. A plurality of actuatable RF amplifiers are provided with each havin ...


6
Hilmer I Swanson: RF power amplifier system having amplifier protection. Harris Corporation, Tarolli Sundheim & Covell, March 26, 1991: US05003271 (18 worldwide citation)

The amplifier includes a bridge circuit having an input circuit adapted for connection across a DC voltage source and an output circuit connected across a load. The bridge circuit includes first and second transistors for, when on, connecting the DC voltage source across the load for DC current flow ...


7
Hilmer I Swanson: RF power supply for supplying a regulated power amplified unmodulated drive signal to an RF modulator. Harris Corporation, Tarolli Sundheim & Covell, August 7, 1990: US04947455 (17 worldwide citation)

An RF power supply serves to supply a regulated power amplified RF drive signal to an RF transmitter. The supply includes an RF oscillator for providing an RF input signal. A DC voltage source provides a DC voltage V. A plurality of power amplifiers are provided with each receiving the input RF sign ...


8
Hilmer I Swanson: RF power amplifier protection. Harris Corporation, Tarolli Sundheim & Covell, August 22, 1989: US04859967 (15 worldwide citation)

An RF power amplifier is operated by supplying an RF signal to the amplifier for amplification and thereby providing an output RF signal to the amplifier's output circuit which has an impedance matching output network connected in series with a load. A detector serves to detect any reflected power i ...


9
Hilmer I Swanson: RF splitter circuit. Harris Corporation, Tarolli Sundheim & Covell, July 14, 1987: US04680559 (11 worldwide citation)

A signal dividing network is provided as an RF splitter for use in supplying N load devices of varying impedances with RF signals such that each of the N signals is of essentially the same magnitude and phase. The splitter includes a plurality of step-down auto transformers, each having a primary an ...


10
Hilmer I Swanson: RF power amplifier system having amplifier protection. Harris Corporation, Tarolli Sundheim & Covell, August 14, 1990: US04949050 (11 worldwide citation)

An RF power amplifier having improved amplifier protection. An RF source provides an RF signal to be amplified. The amplifier includes a bridge circuit having an input circuit adapted for connection across a DC voltage source and an output circuit connected across a load. The bridge circuit includes ...