Patents by Inventor Darrell L. Ash

Darrell L. Ash 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).

  • Patent number: 5789990
    Abstract: A crystal-controlled oscillator circuit is modified by the present invention by replacing the crystal with the first signal port of a two-port SAW resonator filter that has a low-loss primarily inductive characteristic and taking the oscillation output from the other port of the filter to provide an oscillator frequency with harmonics that are reduced significantly when compared to the output of a crystal-controlled oscillator.
    Type: Grant
    Filed: February 14, 1996
    Date of Patent: August 4, 1998
    Assignee: RF Monolithics, Inc.
    Inventors: Darrell L. Ash, Benjamin P. Abbott
  • Patent number: 5787117
    Abstract: A transceiver including a receiver having a sequential amplifier that includes at least first and second RF amplifier stages coupled together by a delay line. A transmitter in the transceiver includes an oscillator for generating an RF carrier and the oscillator includes the delay line as a phase shifting element. A modulator is coupled to the oscillator for modulating the RF carrier either AM, OOK modulated, FM, FSK modulated, PM, and PSK modulated.
    Type: Grant
    Filed: January 26, 1996
    Date of Patent: July 28, 1998
    Assignee: RF 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: 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: 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: 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: 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: 4408347
    Abstract: A high-frequency channel selector for a television receiver including at least one fixed filter having a predetermined passband, and a high-frequency mixer. The antenna for the television receiver receives radiated electromagnetic signals including, for example, a plurality of television channels. The fixed filter has an input coupled to the antenna and filters one fixed frequency spectrum of television channels from the received signals. The mixer has inputs coupled to simultaneously receive the fixed frequency spectrum of channels and mixing signals of a high selectable frequency. The high selectable frequency shifts selectable channels of the spectrum to high intermediate frequency substantially greater than 45 MHz.
    Type: Grant
    Filed: July 29, 1977
    Date of Patent: October 4, 1983
    Assignee: Texas Instruments Incorporated
    Inventor: Darrell L. Ash
  • Patent number: 4162451
    Abstract: An improved channel selector for a television receiver includes a metal semiconductor field effect transistor, i.e. MESFET mixer in combination with an acoustic surface wave device filter. The MESFET mixer simultaneously receives a plurality of channels and mixing signals of a selectable frequency, and in response thereto frequency shifts selectable channels to a predetermined center frequency. The MESFET mixer has almost perfect square law characteristics, and accordingly introduces extremely small distortion into the system. The acoustic surface wave device filter has an input coupled to the output of the MESFET mixer. The surface wave device filter provides essentially all of the channel selectivity of the receiver.
    Type: Grant
    Filed: July 5, 1977
    Date of Patent: July 24, 1979
    Assignee: Texas Instruments Incorporated
    Inventor: Darrell L. Ash
  • Patent number: 4162452
    Abstract: A channel selector for a television receiver having a low gain, high-frequency radio frequency-intermediate frequency section as combined with a relatively high-gain, lower intermediate frequency in the intermediate frequency section to reduce noise, such as intermodulation distortion and cross-modulation distortion. The channel selector comprises a frequency spectrum filter in the RF section, a mixer which preferably includes a metal semiconductor field effect transistor, i.e. MESFET, and a channel selecting filter. The frequency spectrum filter is coupled to the antenna of the television receiver and filters a frequency spectrum of radio frequency signals as received from the antenna, such as a plurality of television channels. The mixer has an input coupled to the frequency spectrum filter and frequency shifts selected channels of the frequency spectrum to a predetermined relatively high intermediate frequency.
    Type: Grant
    Filed: July 5, 1977
    Date of Patent: July 24, 1979
    Assignee: Texas Instruments Incorporated
    Inventor: Darrell L. Ash