Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – Combining of plural signals
Patent
1997-11-04
2000-03-14
Wells, Kenneth B.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
Combining of plural signals
327356, 327563, 455333, G06F 744
Patent
active
060378255
ABSTRACT:
In a tree mixer having an input differential pair of transistors as a gain stage and two differential pairs of transistors (transistor quad) as a mixing stage, a further transistor quad in the mixing stage is provided. The further transistor quad is complementary with respect to the first transistor quad. A DC offset is applied between respective mixing inputs of the two transistor quads and the local oscillator input signal is applied to both inputs. The two transistor quads are interconnected through summing circuits such as current mirrors. By appropriately setting the DC offset the mixer can be operated in class A, B or AB as desired.
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B. Gilbert (Analog Devices). Design Considerations for BJT Active Mixers. (Course Notes). 1995.
Nortel Networks Corporation
Wells Kenneth B.
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