Passive mixer with improved linearity

Details Passive mixer with improved linearity Passive mixer with improved linearity

2006-09-26

2006-09-26

Vo, Nguyen T. (Department: 2618)

Telecommunications

Transmitter

Frequency conversion

C455S326000, C455S333000

Reexamination Certificate

active

07113755

ABSTRACT:
A mixer circuit in accordance with an embodiment of the invention includes a first mixer stage including first and second transmission gates, and a second mixer stage including third and fourth transmission gates. The mixer further includes a first base band signal terminal coupled with the first and second transmission gates and a second base band signal terminal coupled with the third and fourth transmission gates. The mixer circuit processes signals so as to mix a base band signal communicated to the first and second base band signal terminals with a differential LO signal communicated to first and second LO signal terminals to create a first mixed differential signal. Alternatively, the mixer extracts a base band signal from a mixed signal communicated to the first and second mixed signal terminals signal using the LO signal communicated to the first and second LO signal terminals.

REFERENCES:
patent: 6847808 (2005-01-01), Zhou
patent: 6972610 (2005-12-01), Behzad
patent: 2004/0043741 (2004-03-01), Goddard et al.
patent: 2005/0221775 (2005-10-01), Abdelli
RF Microelectronics by Behzad Razavi, © Prentice Hall, pp. 14-25, 1998.
A 1-GHz CMOS UP-Conversion Mixer, Peter R. Kinget et al, IEEE Journal of Solid-State Circuits, vol. 32, No. 3, pp. 370-376, Mar. 1997.

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