Patent ID: 8837956

Claim:
An apparatus, comprising: a phase modulator configured to receive a first signal, a first pulse signal, and to provide a phase-modulated pulse signal on a signal path; a plurality of first switches, each of the plurality of first switches being on the signal path and configured to provide a respective switched phase modulated pulse signal; a plurality of second switches, each of the plurality of second switches being on a reference path and configured to provide a respective switched reference clock signal; a plurality of demodulators each being configured to receive the respective switched phase modulated pulse signal from a respective first switch of the first switches and the respective switched reference clock signal from a respective second switch of the second switches and provide a respective first demodulator signal and a respective second demodulator signal; a plurality of first converters each being configured to receive the respective first demodulator signal from a respective demodulator of the demodulators and provide a respective first converter signal; a plurality of second converters each being configured to receive the respective second demodulator signal from the respective demodulator of the demodulators and provide a respective second converter signal; a plurality of Fourier transforms, each transform being configured to receive the respective first converter signal from a respective first converter of the first converters and the respective second converter signal from a respective second converter of the second converters and to provide a respective Fourier signal; a plurality of phase shifters each being configured to receive the respective Fourier transform signal from a respective Fourier transform of the Fourier transforms and to provide a respective phase delay corresponding a relationship of a phase shifter of the respective phase shifters to the signal path; and a summer coupled to the phase shifters for providing a spectrum of the first signal.