880MHz Low Noise Amplification Application Circuit Composed Of RF2347

Published:2011/5/3 20:00:00 Author:Robert | Keyword: 880MHz, Low Noise, Amplification, Application | From:SeekIC

This pictureshown below is the 880MHz low noise amplification application circuit composed of RF2347. The RF signal is inputed to the 3 foot, and is outputed from 7 foot after amplification in the amplifiers. The 3 footis directly coupled with the internal amplifier, so a 22pF block-DC coupling capacitor is added outside the 3 foot, and therelated resistance would be 50Ω when working at 836MHz. The 7 foot is the output port of the open collector electrode, which can be connected to power Vcc through choke coil or matching inductor. This foot's typical matching resistance is 50Ω, and can be connected to external output-matching networks to suit the amplifier's output resistance, so that can get the maximum output power and efficiency. The 1 foot is for power down control terminal, which is used to control the drift current. When VPD=(2.8±0.1)V (Typical IPD is 8.5mA) the circuit begins to work; when VPD<0.9V the circuit becomes closed; VPD reqiures external RF bypass circuit.



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