Patent ID: 7630458
Filing Date: 2009-12-08
Classification: G01S,H03D,H04L

Abstract:
1. An apparatus for phase sampling an incoming signal in a digital receiver, the apparatus comprising: a downconverter configured to downconvert the incoming signal to an Intermediate Frequency (IF) signal; a zero crossing detector configured to receive the IF signal and to detect a zero crossing; a counter in signal communication with the zero crossing detector configured to run at a higher frequency than the IF signal and to output a state of the counter when the zero crossing detector detects a zero crossing; an analog-to-digital converter (ADC) in signal communication with the zero crossing detector configured to receive the IF signal and determine a state of the magnitude of the IF signal when the zero crossing detector detects a zero crossing; and a phase detector in signal communication with zero crossing detector and the ADC configured to extract a phase of the IF signal from the outputted state of the counter and the state of the magnitude of the IF signal determined by the ADC.