US 9,813,077 B2
Asynchronous electrical circuitry techniques for producing stationary carrier signal to encode input signal amplitude into output signal time-sequence information
James Hamond, Lake Oswego, OR (US); and Robert D. Batten, Portland, OR (US)
Assigned to Indice Semiconductor Inc., Tualatin, OR (US)
Appl. No. 15/323,038
Filed by Indice Semiconductor Inc., Tualatin, OR (US)
PCT Filed Jun. 30, 2015, PCT No. PCT/US2015/038690
§ 371(c)(1), (2) Date Dec. 29, 2016,
PCT Pub. No. WO2016/004122, PCT Pub. Date Jan. 7, 2016.
Claims priority of application No. 2014902511 (AU), filed on Jun. 30, 2014.
Prior Publication US 2017/0134040 A1, May 11, 2017
Int. Cl. H03M 3/00 (2006.01)
CPC H03M 3/50 (2013.01) [H03M 3/32 (2013.01); H03M 3/39 (2013.01); H03M 3/402 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method of asynchronously encoding amplitude information of a system input signal into time-sequence information of a pulse-width modulated system output signal, the method comprising:
establishing at a digitizer an operating point value as an average amplitude of the system input signal;
applying 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;
introducing an asynchronous time delay to the pulse-width modulated digitizer output signal to produce the pulse-width modulated system output signal;
performing digital to analog conversion (DAC) to the pulse-width modulated system output signal to produce a DAC output signal; and
integrating the DAC output signal or its summation with the passband signal component to produce the feedback signal component, in which the feedback signal component has an opposite polarity to that of the multicomponent digitizer-input signal that, for each cycle of the multicomponent digitizer-input signal, reaches the operating point value and includes a transitional region having a duration and a polarity between the operating point value and a peak value of the transitional region, the duration being proportional to and the polarity matching that of the amplitude information of the system input signal so as to encode the amplitude information.