Patents Assigned to ABI Systems Limited
  • Amplifiers with effectively zero input capacitance
    Patent number: 4988953
    Abstract: An amplifier includes a first integrated circuit differential amplifier, the output of the first differential amplifier being fed back to its inverting input, an input is applied to its non-inverting input and second and third differential amplifiers are provided in the positive and negative supply line by which the input signal to the first differential amplifier may be imposed on the positive and negative supplies, so that the input capacitance of the first differential amplifier is effectively zero.
    Type: Grant
    Filed: June 14, 1989
    Date of Patent: January 29, 1991
    Assignee: ABI Systems Limited
    Inventor: Bernard Bollons