Apparatus for selecting a predetermined portion of an analog signal and gating it to an output
AssigneeIowa State University Research Foundation, Inc.
InventorDelbert O. Whitmer
Life of this patent
Estimating the term…
Abstract
An input signal is fed to one signal lead of a gate or switch and, at the same time, to circuitry for initiating and terminating the conduction period of the gate. A bistable circuit is controlled by the initiation and termination circuitry, and it feeds the control lead of the gate to couple a predetermined portion of the input analog signal to an output. The initiation and termination circuitry provides for independent selection of the polarity of the slope and the amplitude of the incoming waveform in defining the start and end points on the incoming waveform for coupling to the output.
Claims3
Apparatus for selecting a predetermined portion of an input signal and for coupling said portion to an output while controlling the length of the selected portion comprising:
- controlled gate circuit means having a first signal terminal connected to receive said input signal, a second signal terminal connected to said output for coupling a selected portion of said input signal thereto, and a control terminal;
- initiation circuit means responsive to said input signal for generating a start signal including first comparator circuit means having first and second inputs, first settable circuit means for generating a first reference voltage of predetermined magnitude and polarity, first slope polarity selection circuit means for coupling said first reference voltage and said input signal to said first and second inputs of said first comparator circuit means;
- termination circuit means for generating a termination signal including second comparator circuit means having first and second inputs, second settable circuit means for generating a second reference voltage of predetermined magnitude and polarity, second slope polarity selection circuit means for coupling said second reference voltage and said input signal to said first and second inputs of said second comparator circuit means;
- and bistable circuit means responsive to said start signal and said termination signal and feeding the control terminal of said switch means for causing said switch means to conduct in response to said start signal and for causing said switch to open in response to said termination signal;
- whereby said start and termination signals may be set to occur independently either on a positive or a negative slope of said input signal and at a desired voltage level.
Dependencies are inferred from the claim text.