US 10,148,322 B2 · Demodulator of a wireless communication reader

Abstract

A demodulator including a peak sampler to control an ADC or a digital resampler to sample a carrier signal in an unmodulated state at peaks, and to sample the carrier signal in a modulated state at a phase of the unmodulated state; and an envelope builder to determine an envelope signal based on differentials between maximum and minimum peaks of respective cycles of the sampled carrier signal. Further, a demodulator having an offset estimator to estimate in-phase and quadrature components of a carrier signal in an unmodulated state to determine in-phase and quadrature component offsets; a load modulated signal estimator to estimate in-phase and quadrature components of a load modulated signal by removing the in-phase and quadrature component offsets from in-phase and quadrature component samples of the carrier signal; and an envelope builder to build an envelope signal by combining the in-phase and quadrature components of the load modulated signal.

Claims33

Dependent claims

A demodulator of a wireless communication reader, comprising:

a peak sampler configured to sample a carrier signal in an unmodulated state at peaks, and to sample the carrier signal in a modulated state at a phase of the unmodulated state;
and
an envelope builder having an input coupled to an output of the peak sampler, and configured to determine an envelope signal based on differentials between maximum and minimum peaks of respective cycles of the sampled carrier signal.

Dependencies are inferred from the claim text.

Demodulator of a wireless communication reader

Life of this patent

Demodulator of a wireless communication reader

Life of this patent

Abstract

Claims33