Patent ID: 6819914
Filing Date: 2004-11-16
Classification: H03D,H03G,H04B

Abstract:
A receiver front end comprising:a) a transformer comprising a primary formed from series connected first and second primary windings and a secondary formed from series connected first and second secondary windings, the primary having a center tap at a junction of the first and second primary windings for receiving a bias signal and the secondary having a center tap at a junction of the first and second secondary windings for sinking current; b) a differential radio frequency (RF) input having a first node operatively coupled to the first primary winding and a second node operatively coupled to the second primary winding; and c) differential mixing circuitry comprising: i) a differential input having a first node coupled to the first secondary winding and a second node coupled to the second secondary winding; ii) a differential local oscillator (LO) input; and iii) a differential intermediate frequency (IF) output, wherein a differential RF signal applied to the first and second primary windings is coupled to the differential input of the differential mixing circuitry via the first and second secondary windings and mixed with a differential local oscillator signal to provide a differential IF signal at the differential IF output.