Title: Controllable mixer
Application Number: 200480031346 Application Date: 2004.09.13
Publication Number: 1871766 Publication Date: 2006.11.29
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03D7/14,H03D7/12,H04B1/10
Applicant(s) Name: Thomson Licensing SA Address:
Inventor(s) Name: Peusens Herbert
Attorney & Agent: lu xiaozhang li xiaoshu
Abstract:
     A heterodyne receiver has a mixer with at least one transistor whose operating point can be varied dynamically. The quality of the output signal from the mixer is assessed in order to control the operating point. The operating point is set such that the collector current is increased when the intermodulation interference is high, thus improving the intermodulation resistance. The collector current is reduced when the intermodulation interference is low, thus reducing the transistor noise. Furthermore, the current drawn is reduced in this situation. The circuit and the method are particularly suitable for RF receivers without tunable input filters, and for receivers in which the power consumption must be low.
Time: 11