Patents Assigned to Motor Finance Corporation
  • Pulse-width and frequency modulator circuit
    Patent number: 3995178
    Abstract: A very accurate, low-offset switching circuit is provided. The switching circuit is used in a modulator which permits output pulses to be modulated in width and/or frequency. The reversible output signals of the switching circuit are added to the modulating input signal and the sum is integrated. A level detector changes the polarity of its output voltage whenever the output of the integrator reaches either of two fixed levels. The output of the level detector is used to drive the field-effect transistors to control the switching of the output of the differential amplifier.
    Type: Grant
    Filed: October 31, 1975
    Date of Patent: November 30, 1976
    Assignee: Motor Finance Corporation
    Inventor: Roswell W. Gilbert
  • Electrical switching device and modulator using same
    Patent number: 3944852
    Abstract: In the switching circuit, the output signal from a high-gain differential amplifier is caused to reverse polarity by means of the switching of a pair of field-effect transistors. A resistor is connected in series with the inverting lead of the differential amplifier, and a signal source is connected to the resistor at an input terminal. The field-effect transistors are used to connect the non-inverting lead of the differential amplifier alternately between the input terminal and ground. This causes the amplifier output to reverse polarity, and thus provides a very accurate, low-offset means of switching the output of the amplifier. The switching circuit is used in a modulator which permits output pulses to be modulated in width and/or frequency. The reversible output signals of the switching circuit are added to the modulating input signal and the sum is integrated. A level detector changes the polarity of its output voltage whenever the output of the integrator reaches either of two fixed levels.
    Type: Grant
    Filed: April 16, 1973
    Date of Patent: March 16, 1976
    Assignee: Motor Finance Corporation
    Inventor: Roswell W. Gilbert
  • Multiplier, divider and wattmeter using a switching circuit and a pulse-width and frequency modulator
    Patent number: RE29079
    Abstract: In the switching circuit, the output signal from a high-gain differential amplifier is caused to reverse polarity by means of the switching of a pair of field-effect transistors. A resistor is connected in series with the inverting lead of the differential amplifier, and a signal source is connected to the resistor at an input terminal. The field-effect transistors are used to connect the non-inverting lead of the differential amplifier alternately between the input terminal and ground. This causes the amplifier output to reverse polarity, and thus provides a very accurate, low-offset means of switching the output of the amplifier. The switching circuit is used in a modulator which permits output pulses to be modulated in width and/or frequency. The reversible output signals of the switching circuit are added to the modulating input signal and the sum is integrated. A level detector changes the polarity of its output voltage whenever the output of the integrator reaches either of two fixed levels.
    Type: Grant
    Filed: July 17, 1975
    Date of Patent: December 14, 1976
    Assignee: Motor Finance Corporation
    Inventor: Roswell W. Gilbert