Loading circuit capable of canceling DC offset and mixer...

Details Loading circuit capable of canceling DC offset and mixer... Loading circuit capable of canceling DC offset and mixer...

2006-09-05

2006-09-05

Tra, Quan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Combining of plural signals

C327S360000, C327S427000, C330S252000

Reexamination Certificate

active

07102412

ABSTRACT:
A loading circuit capable of canceling a DC offset and a mixer using the same. The loading circuit includes a first current mirror unit and a second current mirror unit for respectively receiving a first input signal and a second input signal and generating a first signal current and a second signal current proportional to the first and second input signals, a first compensation unit and a second compensation unit for respectively receiving the first and second input signals, filtering AC components of the input signals, and generating a first compensation current and a second compensation current proportional to the DC components of the first and second input signals, a first loading unit for receiving the first signal current and the second compensation current and generating a first output signal, and a second loading unit for receiving the second signal current and the first compensation current and generating a second output signal.

REFERENCES:
patent: 4873702 (1989-10-01), Chiu
patent: 5748681 (1998-05-01), Comino et al.
patent: 5764086 (1998-06-01), Nagamatsu et al.
patent: 5793230 (1998-08-01), Chu et al.
patent: 5798644 (1998-08-01), Eslambolchi et al.
patent: 5854574 (1998-12-01), Singer et al.
patent: 2005/0195021 (2005-09-01), Cheng

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