880MHz low-noise amplifier application circuit composed of RF2347

As shown in FIG constituted by 880MHz RF2347 low noise amplifier application circuit. Radio frequency (RF) signal from the input pin 3, after the output of the amplifier 7 feet

. 3 feet and the internal amplifier is directly coupled, so 3 feet plus a 22pF blocking coupling capacitance, impedance matching at 836MHz work as 50. 7 feet for the open collector output terminal can be connected to the power supply Vcc through choke or matching inductor, the pin impedance matching is typically 50, external output matching network allows the amplifier output impedance matching for maximum output power and efficiency. 1 foot for the power down control terminal for controlling bias. When VPD (2.8 0.1) V when (IPD is typically 8.5mA) circuit; when VPD 0.9V circuit closes; VPD requested additional RF bypass circuit.

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