The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 01, 1991
Filed:
Aug. 28, 1990
Marvin E Frerking, Cedar Rapids, IA (US);
Roy W Berquist, Toddville, IA (US);
Rockwell International Corporation, El Segundo, CA (US);
Abstract
A digital mixer employs a plurality of flip-flops to mix two digital input signals and provide a beat frequency output. The first input signal is provided as a clock signal to a first D flip-flop and to a third JK flip-flop. The second input signal is provided as a clock signal to a second D flip-flop. The inverted output of the first flip-flop is provided as a clock input to a fourth JK flip-flop. The non-inverted and inverted outputs of the second flip-flop are connected, respectively, to the J and K inputs of the third flip-flop. The non-inverted outputs of the second and third flip-flops are input to a first AND gate, the output of which connects to the J input of the fourth flip-flop. Likewise, the inverted outputs of the second and third flip-flops are input to a second AND gate, the output of which connects to the K input of the fourth flip-flop. The non-inverted output of the fourth flip-flop provides a beat frequency that is one-half the difference frequency of the two input signals. The third flip-flop in the digital mixer prevents glitches around the transition time of the beat frequency output even for very low beat frequencies.