Mixer having controllable load with reduced equivalent load...

Details Mixer having controllable load with reduced equivalent load... Mixer having controllable load with reduced equivalent load...

2008-05-20

2010-06-15

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Combining of plural signals

C327S361000, C455S326000, C455S333000

Reexamination Certificate

active

07737760

ABSTRACT:
A mixer has a controllable load, a signal mixing module, and a controller. The controllable load is controlled by a control signal to change an equivalent load value thereof. The signal mixing module has an output port coupled to the controllable load and an input port coupled to an input signal, and is used for mixing the input signal with a local oscillation signal. The controller is coupled to the controllable load, and is used for generating the control signal to reduce the equivalent load value of the controllable load during switching transients of the local oscillation signal.

REFERENCES:
patent: 7356317 (2008-04-01), Xu et al.
patent: 2005/0164671 (2005-07-01), Darabi
patent: 2007/0066269 (2007-03-01), Kivekas et al.
patent: 2009/0239495 (2009-09-01), Sellars et al.
“Direct-Conversion WCDMA Transmitter with -163dBc/Hz Noise at 190MHz Offset”,Jones, ISSCC 2007/Session 19/Cellular and Multi-mode Transceivers/19.1, pp. 336-337 and 607, Feb. 13, 2007.
“A Linear Uplink WCDMA Modulator with -156dBc/Hz Downlink SNR”, Papadopoulos, ISSCC 2007/Session 19/Cellular and Multi-mode Transceivers/19.2, pp. 338-339 and 607, Feb. 13, 2007.

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