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US 7,746,151 B2Granted
Variable gain mixer
AssigneeFci
InventorSung Ho Beck
Life of this patent
Estimating the term…
Abstract
The mixer includes mixers constructed with variable gain amplifiers having two transistor pairs Qp+/Qp− and Qn+/Qn− to have a predetermined gain by using LO+ and LO− signals; and LO bias circuits connected to have bias voltages different from each other with respect to the LO+ and LO− signals of the mixers and share an input signal.
Claims2
A variable gain mixer comprising:
- mixers constructed with variable gain amplifiers having two transistor pairs Qp+/Qp− and Qn+/Qn− to have a predetermined gain by using LO+ and LO− signals;
- and
- LO bias circuits connected to have bias voltages different from each other with respect to the LO+ and LO− signals of the mixers and share an input signal,
- wherein the LO bias circuit is constructed with an operation amplifier, a first resistance connected to an output of the operation amplifier, and a second resistance connected between an output of the first resistance and an input of the operation amplifier to remove a capacitive load to the input of the operation amplifier.
1 more element
Dependencies are inferred from the claim text.