Patent ID: 9722648
Date: 2017-08-01
CPC Classifications: H04B,H04L

Claim:
1. An integrated circuit device comprising: a frequency detector; wherein the frequency detector comprises: a timer state machine unit coupled to a timer and arranged to receive an incoming carrier signal, determine whether the incoming carrier signal comprises a valid frequency, generate a valid carrier indication when the incoming carrier signal is determined as having said valid frequency, and continuously switch operation of the timer between at least a first timing mode of operation and a second timing mode of operation of the frequency detector in response to the determination, wherein the detector determines whether the incoming carrier signal comprises said valid frequency in the first timing mode of operation based on a first number of carrier signal edges of the incoming carrier signal, and determines whether the incoming carrier signal comprises said valid frequency in the second timing mode of operation based on a second number of carrier signal edges of the incoming carrier signal, the second number different than the first.