RF passive mixer with DC offset tracking and local...

Details RF passive mixer with DC offset tracking and local... RF passive mixer with DC offset tracking and local...

2007-10-02

2007-10-02

Gelin, Jean (Department: 2617)

Telecommunications

Transmitter

Power control, power supply, or bias voltage supply

C455S323000, C455S260000, C455S343100, C370S350000

Reexamination Certificate

active

10147699

ABSTRACT:
An apparatus and method for tracking a DC offset in a mixer circuit used in wireless communication systems and for providing local oscillator DC bias level-shifting to reduce even order distortion resulting from the DC offset is described. The apparatus has an input coupled to a mixer circuit output for receiving a DC voltage present on the mixer circuit output. The DC voltage includes an offset component. A level shifting circuit is coupled to the input for level shifting the received DC voltage a predetermined amount. An output of the level shifting circuit is coupled to a local oscillator input for outputting the level shifted DC voltage to the local oscillator input. The shift in the DC bias level at the local oscillator input of the mixer circuit provided by the apparatus and method reduces even order distortion in the mixer circuit, including second order intermodulation (IM2) distortion.

REFERENCES:
patent: 3805162 (1974-04-01), Hoffmann et al.
patent: 5317280 (1994-05-01), Zimmer et al.
patent: 5513184 (1996-04-01), Vannucci
patent: 5724653 (1998-03-01), Baker et al.
patent: 5752181 (1998-05-01), Vice
patent: 6021323 (2000-02-01), Vagher
patent: 6138000 (2000-10-01), Navid et al.
patent: 2002/0004376 (2002-01-01), Lee et al.

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