Circuitry with resistive input impedance for generating pulses from analog waveforms
AssigneeNational University of Singapore
InventorsJonathan Tun Nan Liu, Jurianto Joe, Siong Siew Yong, Kin Mun Lye
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Abstract
A decoder for generating output pulses or oscillations in response to input analog waveforms includes a circuit having a variable operating point and having a transfer function characterized by an unstable operating region bounded by a first stable operating region and a second stable operating region. In one embodiment, the circuit is characterized by having a resistive input impedance. The analog waveform forces the operating point of the circuit into its unstable and stable regions to produce oscillatory and non-oscillatory behavior at the circuit's output.
Claims16
A decoding system for generating pulses from analog waveforms comprising:
- a source of a known but arbitrary analog waveform, each said analog waveform having a first information region and a second information region;
- and
- a circuit with a variable operating point and having a transfer function characterized by an unstable operating region bounded by a first stable operating region and a second stable operating region,
- said circuit having a resistive input impedance,
- said circuit being responsive to sensing of said first information region to force said variable operating point to vary in order to initiate operation of said circuit in said unstable operating region to produce at least one oscillation, said oscillation having a frequency greater than rate of change of said operating point,
- said circuit being further responsive to sensing of said second information region to force said variable operating point to vary into either one of said stable operating regions in order to terminate said at least one oscillation substantially without transients, wherein said initiating and said terminating alternate.
A decoder for generating pulses from analog waveforms comprising:
- a first circuit for producing a known but arbitrary analog waveform, each said analog waveform having a first information region and a second information region;
- and
- a second circuit having at least one input and an output,
- said second circuit further having a feedback path comprising a reactive element coupled between said output said at least one input,
- said second circuit having a variable operating point,
- said second circuit further having a transfer function characterized by an unstable operating region bounded by a first stable operating region and a second stable operating region,
- said second circuit being responsive to sensing of said first information region to force said variable operating point to vary in order to initiate operation of said circuit in said unstable operating region to produce at least one oscillation, said oscillation having a frequency greater than rate of change of said operating point,
- said circuit being further responsive to sensing of said second information region to force said variable operating point to vary into either one of said stable operating regions in order to terminate said at least one oscillation substantially without transients,
- wherein said initiating and said terminating alternate.
Dependencies are inferred from the claim text.