Patents by Inventor Alan B. Mroch

Alan B. Mroch has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Low noise frequency synthesizer
    Patent number: 7579916
    Abstract: A frequency synthesizer comprising an input large step frequency source suitable for generating a large step frequency, a variable frequency source suitable for generating a small step frequency, a first phase detector, a first voltage controlled oscillator, a first mixer, a second phase detector, a second voltage controlled oscillator, a second mixer, at least two frequency divide circuits and a feedback loop is disclosed. The input large step frequency source and the variable frequency source are suitable for combining to form mixed frequency, second voltage controlled oscillator is in the feedback loop and the feedback loop is suitable for receiving the combination of the large step frequency and the variable frequency.
    Type: Grant
    Filed: June 4, 2007
    Date of Patent: August 25, 2009
    Assignee: Rockwell Collins, Inc.
    Inventor: Alan B. Mroch
  • Superheterodyne tranceiver with bilateral first mixer and dual phase locked loop frequency control
    Patent number: 5423076
    Abstract: A transceiver which operates in separate transmit and receive bands has a first conversion stage for generating a first IF signal translation of a receive signal, which first conversion stage also functions as a first and final, hence, single conversion stage for generating a transmit signal at its transmission frequency. A modulated transmit signal component used in the single conversion to the transmission frequency of the transmission signal has harmonics which lie outside the transmission band and is of a frequency which permits a substantial overlap of transmit and receive injection frequencies generated by a first numerically controlled signal generator which are applied to a first mixer of the first conversion stage during respective transmit and receive mode operations.
    Type: Grant
    Filed: September 24, 1993
    Date of Patent: June 6, 1995
    Assignee: Rockwell International Corporation
    Inventors: Larry L. Westergren, Alan B. Mroch, Gregory A. O'Neill, Jr.
  • AC loop gain and DC prepositioning adjustment for phase locked loop
    Patent number: 4595886
    Abstract: There is disclosed a circuit and technique for adjusting the AC loop gain and DC prepositioning in a phase locked loop. The system includes an in-phase and out-of-phase signal applied through exclusive-OR gate circuitry which includes inputs from a PROM to digitally adjust the AC gain in the phase locked loop. The PROM also stores digital values representing a desired DC prepositioning level which is coupled to the loop and converted to provide a signal summed with the AC signal to adjust the prepositioning level.
    Type: Grant
    Filed: October 19, 1984
    Date of Patent: June 17, 1986
    Assignee: Rockwell International Corporation
    Inventors: Alan B. Mroch, Larry L. Westergren