Patent ID: 7893745

Claim:
A wideband programmable phase shifting circuit, comprising: a divide-by-two frequency divider having an input accepting a periodic input signal voltage and having an output that generates a signal having twice the period of the periodic input signal voltage; an amplifier having at least one input connected to the output of the frequency divider, the amplifier generating a reference voltage output; a reference voltage generator charge pump having inputs accepting the periodic input signal voltage and a complement of the periodic input signal voltage, an output of the reference voltage generator charge pump being connected to the at least one input of said amplifier; a comparator having a first input, a second input, and at least one output; a switched voltage divider network connected to the reference voltage output of the amplifier, the switched voltage divider network having an output generating a percentage of the reference voltage, the reference voltage percentage being determined by a switch configuration of the switched voltage divider network, the switched voltage divider network output being connected to the first input of the comparator; and a comparator charge pump having inputs accepting the periodic input signal voltage and a complement of the periodic input signal voltage, an output of the comparator charge pump being connected to the second input of the comparator; wherein the at least one output of the comparator generates a periodic output signal voltage having a phase shift with respect to the periodic input signal voltage, a value of the phase shift being determined by the reference voltage percentage applied to the first input of the comparator.