US 9,813,268 B2
Digital frequency modulation receiver with frequency variation signal and demodulation method used by the same
Zhuo Fu, Taipei (TW)
Assigned to RichWave Technology Corp., Taipei (TW)
Filed by RichWave Technology Corp., Taipei (TW)
Filed on Jul. 28, 2016, as Appl. No. 15/222,937.
Application 15/222,937 is a continuation of application No. 14/833,151, filed on Aug. 24, 2015, granted, now 9,432,231.
Claims priority of application No. 104107208 A (TW), filed on Mar. 6, 2015.
Prior Publication US 2016/0337151 A1, Nov. 17, 2016
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 27/00 (2006.01); H04L 27/12 (2006.01); H04L 27/227 (2006.01); H04L 27/148 (2006.01)
CPC H04L 27/122 (2013.01) [H04L 27/0014 (2013.01); H04L 27/148 (2013.01); H04L 27/2275 (2013.01); H04L 2027/0026 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A digital frequency modulation receiver comprising:
a coordinate rotation digital computing converter configured to generate a first phase value according to an input signal;
a first adder coupled to the coordinate rotation digital computing converter and configured to subtract a second phase value from the first phase value to generate a phase difference;
a digital filter coupled to the first adder and configured to perform a filtering calculation with the phase difference to generate a frequency variation signal; and
a phase estimator comprising a first integrator coupled to the digital filter and the first adder and configured to perform an integration operation according to the frequency variation signal to update the second phase value;
wherein the digital frequency modulation receiver does not comprise any physical oscillator; and the first integrator is configured to update the second phase value only according to the frequency variation signal.