Patents Assigned to R.F. Monolithics
  • Patent number: 5357206
    Abstract: A sequential amplifier having at least two amplifier stages separated by a delay device such that a clock may control both stages to energize one while the other is de-energized, thus allowing a signal to be amplified by adjacent amplifier stages without the adverse effects of feedback associated therewith.
    Type: Grant
    Filed: January 21, 1993
    Date of Patent: October 18, 1994
    Assignee: R.F. Monolithics, Inc.
    Inventor: Darrell L. Ash
  • Patent number: 5357207
    Abstract: A sequential amplifier having at least two amplifier stages separated by a delay device such that switching means may energize either or both amplifier stages at any given time to obtain maximum gain of the input signal so long as no oscillations occur between stages, thus allowing a signal to be amplified by adjacent amplifier stages without the adverse effects of feedback associated therewith.
    Type: Grant
    Filed: June 23, 1993
    Date of Patent: October 18, 1994
    Assignee: R.F. Monolithics, Inc.
    Inventor: Darrell L. Ash
  • Patent number: 5073763
    Abstract: Novel GSPUDT structures are disclosed with 3/8.lambda. and 5/8.lambda. group sampling with 3.lambda. and 5.lambda. group responses. Reflectionless or unidirectional transducers, and broadband notch elements are all implementable with these new configurations. These GSPUDTs are similar to the conventional SPUDT and the "Hopscotch" transducers in that single level versions are reflectionless. Unidirectional characteristics are only obtainable from a two-level structure.
    Type: Grant
    Filed: November 2, 1990
    Date of Patent: December 17, 1991
    Assignee: R.F. Monolithics, Inc.
    Inventor: Peter Wright
  • Patent number: 4910839
    Abstract: A single-phase unidirectional surface acoustic wave transducer comprising a piezoelectric substrate and a transducer having localized symmetry and constructed for establishing a predetermined separation between the centers of acoustic wave reflection and transduction on said substrate by selectively orienting the transducer on a specific cut of said substrate to achieve a separation between said centers in a continuum of achievable phase angles of 0.degree.-360 .degree..
    Type: Grant
    Filed: December 3, 1984
    Date of Patent: March 27, 1990
    Assignee: R.F. Monolithics, Inc.
    Inventor: Peter Wright
  • Patent number: 4902925
    Abstract: A reflectionless surface acoustic wave transducer is proposed which has first and second opposed conductive transducer pads on a substrate of piezo-electric material. A plurality of groups of n interdigitated .lambda./4 electrodes extend from the opposed pads to form an elongated transducer. Each group of n interdigitated electrodes has a spacing within the group of .lambda./4 and the spaces between adjacent groups of the interdigitated electrodes are .lambda./2 such that adjacent groups cancel reflections from each other thereby establishing a reflectionless surface acoustic wave transducer.
    Type: Grant
    Filed: March 15, 1988
    Date of Patent: February 20, 1990
    Assignee: R.F. Monolithics, Inc.
    Inventor: Peter V. Wright
  • Patent number: 4760352
    Abstract: A phase shift oscillator formed with a surface acoustic wave coupled resonator in series with an amplifier and wherein the coupled resonator has a substantially 180.degree. phase shift occurring between the 3dB points of the frequency response curve of the coupled resonator.
    Type: Grant
    Filed: September 4, 1987
    Date of Patent: July 26, 1988
    Assignee: R.F. Monolithics
    Inventor: Darrell L. Ash