Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Reexamination Certificate
2006-12-05
2006-12-05
Anderson, Matthew (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
C327S113000, C455S324000
Reexamination Certificate
active
07146150
ABSTRACT:
The invention relates to a mixing circuit for mixing a first signal RF with a second signal LO including a conversion stage T3to convert the first signal RF into a current, a mixing core T1and T2to mix said current with the second signal LO, said mixing core being loaded via at least one load element ZC. Said circuit includes noise optimization means taking into account the contribution of the load element or elements ZC to the noise inversely proportional to the frequency that is present in the output signal. In particular the load elements can be selected from inductive resistors or silicon resistors or be constituted by resistors of a size selected to optimize the noise inversely proportional to frequency.The invention allows the production of mixers with very good performance at low frequency via a simple micro-electronic process of resistor forming.
REFERENCES:
patent: 4628518 (1986-12-01), Chadwick et al.
patent: 4958638 (1990-09-01), Sharpe et al.
patent: 5241702 (1993-08-01), Dent
patent: 5644260 (1997-07-01), DaSilva et al.
patent: 5694093 (1997-12-01), DaSilva et al.
patent: 6072947 (2000-06-01), Roychowdhury et al.
patent: 6844780 (2005-01-01), Miyagi
patent: 2003/0017816 (2003-01-01), Souetinov
patent: 2003/0228860 (2003-12-01), Jou
patent: 0232560 (1987-08-01), None
K. Negus; “3.3V GPS Receiver MMIC Implemented on a Mixed Signal Silicon Bipolar Array”, 1992 IEEE International Microwave Symposium Digest, vol. 2, Jun. 01, 1992, pp. 1071-1074, XP0003434790.
D. Boewers; “Minimizing Noise in Analog Bipolar Circuit Design”, IEEE: Proceedings of the Bipolar Circuits Technology Meeting, Sep. 18, 1989, XP010089296.
Anderson Matthew
Dao Minh
NXP B.V.
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