Patent ID: 7839219
Filing Date: 2010-11-23
Classification: H03F,H03H

Abstract:
1. A low-noise amplifier circuit to convert a single-ended input into a dual-ended output, comprising: a first amplifier circuit, including a first MOS transistor in a common gate amplifier configuration coupled in parallel with a second MOS transistor; a second amplifier circuit, including a third MOS transistor connected in parallel with a fourth MOS transistor; each of the first, second, third, and fourth transistors having a gate, a source, and a drain; the first amplifier circuit and the second amplifier circuit being cascode coupled to form a cascode amplifier configuration; the source of the first transistor serving as the single-ended input; the dual-ended output being a differential output across the drain of the third transistor and the drain of the fourth transistor; and a resonant cavity filter circuit coupled to the gate of the first transistor.