1
Floyd D Erps, Raymond L Fried: Phase-locked loop frequency synthesizer. John Fluke Mfg Co, Christensen O Connor Johnson & Kindness, November 23, 1982: US04360788 (30 worldwide citation)

A programmable divide-by-N phase-locked loop having a pulse incrementor circuit and a single sideband mixer circuit embedded in the loop feedback path is disclosed. In each disclosed arrangement, one input port of the single sideband mixer receives the signals supplied by the phase-locked loop volta ...


2
Ben Flugstad, Raymond L Fried, Alan Hedge, Barton L McJunkin, Mark D Talbot: Frequency modulation in phase-locked loops. Hewlett Packard Company, Leslie G Murray, March 7, 1989: US04810977 (29 worldwide citation)

A phase-locked loop (PLL) frequency synthesizer having an analog, out-of-band component path and a digital, in-band component path to provide frequency modulation (FM) of the synthesized output signal is described. The in-band FM component is octave scaled by an analog scaling means and coupled to a ...


3
Raymond L Fried, David M Hoover: Fast frequency settling signal generator utilizing a frequency locked-loop. Hewlett Packard Company, Leslie G Murray, December 20, 1988: US04792768 (14 worldwide citation)

Signal generating apparatus including a phase-locked loop (PLL) utilizing a voltage-controlled oscillator (VCO) and a frequency-locked loop (FLL) to generate an output signal whose frequency jumps from one value to another in a selectable sequence. The signal generator further includes a delay line ...


4
Raymond L Fried: Frequency synthesizer using phase locked loops. John Fluke Mfg Co, Christensen O Connor Johnson & Kindness, April 25, 1978: US04086544 (7 worldwide citation)

A frequency synthesizer utilizing a series of individual frequency generating circuits, each circuit containing two phase locked loops, the operation of the loops being under the control of a computer which translates the value of the desired frequency into specific digital commands for the individu ...