Patents Assigned to R.F. Monolithics
  • 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: 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: 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: 5061871
    Abstract: An electrode structure for use with a surface acoustic wave device which has the same velocity as the transducers and the gratings forming the device but no reflections and which can be used to vary structure reflectivity.
    Type: Grant
    Filed: January 25, 1991
    Date of Patent: October 29, 1991
    Assignee: R. F. Monolithics, Inc.
    Inventor: Peter Wright
  • Patent number: 5051644
    Abstract: An electrode structure for use with a surface acoustic wave resonator which has the same velocity as the transducers and gratings but no reflections; a second embodiment provides an electrode structure having a velocity equal to the velocity of the transducers and gratings but that has a coefficient of reflectivity that can be predetermined by varying the width of the electrodes in the electrode structure.
    Type: Grant
    Filed: April 19, 1990
    Date of Patent: September 24, 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: 4761616
    Abstract: A voltage controlled oscillator circuit having an amplifier coupled in series with a feedback circuit and having adjustable voltage means coupled to the phase shifting element means for varying the phase shift of the phase shifting element output signal thereby varying the frequency of oscillation of the oscillator circuit.
    Type: Grant
    Filed: September 4, 1987
    Date of Patent: August 2, 1988
    Assignee: R. F. Monolithics, Inc.
    Inventor: Darrell L. Ash
  • 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
  • Patent number: 4749964
    Abstract: A superregenerative detector utilizing a single transistor and having a surface acoustic wave device in the feed back loop coupling the output to the input to cause oscillation wherein the surface acoustic wave device is a low loss delay line formed as a single phase unidirectional transducer on a quartz substrate.
    Type: Grant
    Filed: December 8, 1986
    Date of Patent: June 7, 1988
    Assignee: R. F. Monolithics, Inc.
    Inventor: Darrell L. Ash
  • Patent number: 4694266
    Abstract: A notch filter which utilizes a quadrature coupler with the input signal on one of its four terminals, a first tuned surface acoustic wave device coupled to a second on of the terminals for receiving the input signal at 0.degree. phase shift, a second tuned surface acoustic wave device coupled to a third one of the terminals for receiving the input signal with a 90.degree. phase shift and the fourth terminal being utilized as the output signal terminal.
    Type: Grant
    Filed: July 29, 1986
    Date of Patent: September 15, 1987
    Assignee: R. F. Monolithic, Inc.
    Inventor: Peter V. Wright
  • Patent number: 4682224
    Abstract: A system for providing intelligible video program signals and corresponding video synchronization signals to authorized video displays only comprising transmitting means for transmitting scrambled signals of at least one video program; a receiver for receiving said scrambled video program signals for said at least one video program; and a descrambling unit coupled to said receiver and including an electronic ticket removably coupled to the input of said video receiver for intercepting and descrambling the at least one scrambled video program signal from said receiver and recovering the synchronizing signals, and means coupling the recovered synchronization sweep signals and the unscrambled intelligible video program signals to said video display.
    Type: Grant
    Filed: October 31, 1983
    Date of Patent: July 21, 1987
    Assignee: R. F. Monolithics, Inc.
    Inventors: Lawrence H. Ragan, Clinton S. Hatmann, Darrell L. Ash
  • Patent number: 4682223
    Abstract: A method of descrambling received video program signals with transmitted synchronization signals for use in a video receiver comprising the steps of providing first terminals for receiving the scrambled video signal and second terminals coupled to the video receiver and connecting an electronic ticket containing descrambling circuitry to the first terminals for receiving and descrambling the received video signal and coupling the descrambled video signal from the electronic ticket to the second terminals for transfer to the video receiver.
    Type: Grant
    Filed: October 31, 1983
    Date of Patent: July 21, 1987
    Assignee: R. F. Monolithics, Inc.
    Inventors: Lawrence H. Ragan, Clinton S. Hartmann, Darrell L. Ash
  • Patent number: 4670681
    Abstract: An ST cut quartz crystal for surface acoustic wave device application defined by the Euler angles lambda (.lambda.) equal about 0.degree., mu (.mu.) equal about 132.75.degree. and with an acoustic wave propagation direction theta (.theta.) equal about plus or minus 25.degree..
    Type: Grant
    Filed: July 29, 1986
    Date of Patent: June 2, 1987
    Assignee: R. F. Monolithics, Inc.
    Inventor: Peter V. Wright
  • Patent number: 4670680
    Abstract: A Quartz Crystal for surface acoustic wave device application defined by the Euler angles lambda (.lambda.) equal about 45.degree. and mu (.mu.) equal about 55.degree. with an acoustic wave propagation direction angle theta (.theta.) equal plus about 10.degree. to minus about 30.degree..
    Type: Grant
    Filed: July 29, 1986
    Date of Patent: June 2, 1987
    Assignee: R. F. Monolithics, Inc.
    Inventor: Jeffrey C. Andle
  • Patent number: 4663664
    Abstract: An electronic ticket for descrambling transmitted video program and synchronization signals for use in a video receiver comprising first terminals for receiving the scrambled video signals, a descrambling circuit having its input coupled to the first terminals and producing at least a partially descrambled signal at its output, second terminals for coupling the descrambled signal to the video receiver and enclosing portions of the first and second terminals, and the descrambling circuit in a unitary package whereby the ticket can be used as a plug-in unit.
    Type: Grant
    Filed: October 31, 1983
    Date of Patent: May 5, 1987
    Assignee: R. F. Monolithics, Inc.
    Inventors: Lawrence H. Ragan, Clinton S. Hartmann, Darrell L. Ash
  • Patent number: 4616197
    Abstract: A resonator, resonator filter having an output transducer of typical design and conductance response and an input transducer whose conductance response can be adjusted to offset adverse conductance response of said output transducer thereby providing a unique improved overall conductance response of the resonator, resonator filter.
    Type: Grant
    Filed: December 5, 1985
    Date of Patent: October 7, 1986
    Assignee: R. F. Monolithics, Inc.
    Inventor: Peter V. Wright
  • Patent number: 4599587
    Abstract: An impedance element formed from a single-port, surface acoustic wave transucer which generates a conductance versus frequency response characteristic having first and second peaks separated by a valley at a predetermined frequency and which generates a susceptance versus frequency response characteristic having a substantially constant portion over a finite bandwidth on both sides of said predetermined frequency.
    Type: Grant
    Filed: December 3, 1984
    Date of Patent: July 8, 1986
    Assignee: R. F. Monolithics, Inc.
    Inventors: Clinton S. Hartmann, Peter Wright
  • Patent number: 4581592
    Abstract: An oscillator including an active device (38), a surface acoustic wave resonator (40) connected in a feedback relationship to the active device and an impedance matching circuit is disclosed. The impedance matching circuit in one arrangement is an output impedance matching circuit including an inductor (46) connected in the feedback loop to the output of the active device. In another arrangement, the impedance matching network is an input impedance matching network including an inductor (42) connected in the feedback loop to the input of the active device. In another arrangement of the invention, a varactor diode (60) is connected in the feedback loop and is controlled by a reverse voltage which changes the capacitance of the diode, adjusting the frequency of the oscillator.
    Type: Grant
    Filed: May 3, 1983
    Date of Patent: April 8, 1986
    Assignee: R F Monolithics, Inc.
    Inventor: Ralph C. Bennett
  • Patent number: 4577168
    Abstract: An improved notch filter having a single port, surface acoustic wave transducer in parallel with an inductor and forming a first circuit which primarily blocks the signal frequency at all frequencies except the notch frequency at which point the first circuit becomes essentially resistive and at that point is cancelled by a signal from a second circuit in parallel with said first circuit and which is 180.degree. out-of-phase thereby providing a notch filter.
    Type: Grant
    Filed: December 3, 1984
    Date of Patent: March 18, 1986
    Assignee: R. F. Monolithics, Inc.
    Inventor: Clinton S. Hartmann