Abstract: Asynchronous electrical circuitry produces a stationary carrier signal and encodes a system input signal amplitude into output signal time-sequence information by establishing at a digitizer an operating point value as an average amplitude of the system input signal. It applies to the digitizer a multicomponent digitizer-input signal corresponding to a sum of a passband signal component and a feedback signal component to produce a pulse-width modulated digitizer output signal representing the system input signal. An asynchronous time delay is introduced to produce the pulse-width modulated system output signal. The circuitry performs digital-to-analog conversion (DAC) to the pulse-width modulated system output signal to produce a DAC output signal. The DAC output signal or its summation with the passband signal component is integrated to produce the feedback signal component. Additional, multiple-order embodiments include sequential feedback paths or carrier-shaping functions.

Abstract: A circuit for generating a series of pulses in response to a first signal, the circuit comprising: a lossy integrator which receives a second signal as its input; and a comparator which: receives the output of the lossy integrator at one of its inputs; and receives the first signal at the other of its inputs. This circuit can be incorporated into, for example, audio-frequency amplifiers and regulated power supplies.

Abstract: A power supply control system for a switch-mode power supply comprises a cycle-by-cycle, asynchronous control scheme. The system makes use of including a signal summing and comparing stage and a control signal feedback system configured to control shaping of first and second portions of a comparison signal provided to comparator circuitry that generates a switching-circuitry drive signal.

Abstract: A circuit for generating a series of pulses in response to a first signal, the circuit comprising: a lossy integrator which receives a second signal as its input; and a comparator which: receives the output of the lossy integrator at one of its inputs; and receives the first signal at the other of its inputs. This circuit can be incorporated into, for example, audio-frequency amplifiers and regulated power supplies.