Low-noise amplifiers for use in the mobile and satellite communication terminals are required to show small reflections, low noise figure, miniaturized size, and low power consumption. To achieve small reflections and low noise figure simultaneously, a source inductor is widely used in the design of low-noise amplifiers. The source inductor, however, produces instability, poor isolation, and larger size of the amplifier. To address this problem, we present a design method to employ a series drain resistor for high stability, high isolation, and small size in addition to matching stubs comprised a short-circuited stub and a capacitor for simultaneous gain and noise matching. In this paper, the design method and its application are described.
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