1880MHz internal collector bias amplifier application circuit composed of RF2324

As shown in the figure, this is the 1880MHz internal collector bias amplifier application circuit composed of RF2324. The RF signal (RF) is input from pin 3 and output from pin 7 after being amplified by the preamplifier and the final power amplifier. Pin 3 is directly coupled to the internal amplifier, so a 10pF DC-blocking coupling capacitor is added externally, and the matching impedance is 50Ω when working at 1880MHz. Pin 7 is the open collector output terminal, which can be connected to the power supply VCC through a choke or matching inductor. The typical matching impedance of this pin is 50Ω. The external output matching network matches the amplifier output impedance to it to obtain the maximum output power and efficiency. Pin 1 is the power reduction control terminal. When VPD=2.8V±0.1V (IPD typical value is 8.5mA), the circuit works; when VPD<0.9V, the circuit is turned off. VPD requires an external RF bypass circuit.