Patent · US Active

FSK demodulator

US9225568B1 · kind B1 · utility

9Cited by

2References

14Claims

0Family size

Assignee

Freeescale Semiconductor, Inc. · US

Inventors

Wangsheng Mei · Suzhou, CN
Zhijun Chen · San Jose, US
Zhiling Sui · Suzhou, CN
Yan Xiao · Suzhou, CN

Key dates

Filing date	Apr 23, 2015
Grant date	Dec 29, 2015
Priority date	—
Expiry date	Apr 23, 2035

Classification

Technology area (CPC H)Electricity
CPC primaryH04L27/1563
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

A demodulator suitable for demodulating binary FSK signals having a small difference between carrier frequencies uses a counter-timer technique for timing a fixed number FSK cycles and comparing a count value with a threshold when a frequency change is expected. By grouping a number of FSK pulses (or cycles) together in one measurement, speed requirements on the system clock used for the counter/timer measurements can be relaxed and tolerance to noise is also improved. The demodulator is particularly suitable for wireless charging applications.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.