Single-stage dual-band low-noise amplifier for use in a wireless communication system receiver

摘要: A low-noise amplifier, capable of operation in two or more frequency bands a personal communication services (PCS) receiver other wireless communication system terminal. includes single bipolar junction transistor amplification stage (Q1). Input and output matching networks for the transistor each includes four elements: first series capacitor, (C1; C5), shunt inductor (L4; L5) coupled to ground potential, second capacitor (C6; C7) inductor (L1; L3) coupled supply voltage (V1; V2). These elements are used provide narrowband input matches distinct frequency bands, such as 900 MHz and 1.8 GHz. The capacitors (C1) (C5) matching networks may also be provide DC isolation, respectively, and the inductors (L1) (L3) used to bias base collector, amplifier transistor. The configured using only lumped inductive capacitive elements, with values limited less than about 10 nH pF, respectively. The amplifier minimum gain 15 dB maximum noise figure 2 over 100 MHz-wide bands centered at MHz