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Feed-forward digital phase and amplitude correction system

  • US 5,365,190 A
  • Filed: 05/03/1993
  • Issued: 11/15/1994
  • Est. Priority Date: 05/03/1993
  • Status: Expired due to Term
First Claim
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1. A correction system for stabilizing the phase and amplitude of output pulses generated by a device such that repeatable, RF pulses are generated, said device having an input for receiving a first signal that is to be amplified and an output for delivering periodic RF output pulses of amplified energy to a load comprising:

  • first means for detecting the phase of said first signal and producing a reference signal that is indicative of said phase,second means for detecting the phase in said amplifier output pulses and producing digital output signals that are indicative of said phase in said amplifier output pulses; and

    first means for comparing each of said output signals with said reference signal to produce a sequence of error signals that are indicative of variations of said phase at said pulsed amplifier output during individual ones of said amplifier output pulses, said comparing means comprising a phase detector and said error signals are indicative of phase variations from reference levels at said output of said device, said reference levels being constant or controlled by a digital microprocessor, and means for modifying said phase in said first signal comprising a phase shifter controlled by digital signal processing devices comprising phase error data storage means, timing means, phase correction logic means and phase correction data storage means,said error signals being stored during each of said sequence of said amplifier output pulses,the error signals which were stored during prior amplifier output pulses modifying said phase in said first signal during subsequent output pulses to provide repeatable subsequent output pulses.

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