Patent ID: 7116728
Filing Date: 2006-10-03
Classification: H03D,H04B,H04L

Abstract:
1. A method of receiving a communications signal to produce two output signals in quadrature relation to one another, comprising: deriving two reference signals from a single clock signal using an adjustable dual delay line, the two reference signals being substantially in a quadrature relation to one another, the dual delay line having an error signal input, the dual delay line operable to alter the two reference signals based upon a signal received at the error signal input; using the two reference signals, performing frequency downconversion of the communications signal to produce the two output signals; forming an error signal representing the expectation of the product of the two output signals; propagating said error signal to said error signal input of said dual delay line; and using the error signal to adjust said dual delay line in order to alter a relative delay between the two reference signals.