collector amplitude modulation circuit

The collector amplitude modulation efficiency is high and the output power is large. The circuit is as shown in the figure. The
    low-frequency modulation signal
un(￡) is connected in series with the DC power supply VcT of the Class C amplifier . Therefore, the effective collector power supply voltage Vcc of the amplifier is equal to the
sum of the two voltages and changes with the modulation signal. Capacitor C' in the figure is a high
-frequency bypass capacitor, forming a high-frequency signal path. For modulated signals , it is equivalent to
an open circuit.
    Binglou high-frequency power amplifier, when the base is biased Vk. The excitation high-frequency
signal voltage amplitude Uh and the collector effective loop impedance RP remain unchanged.
When only the collector effective power supply voltage is changed, the collector current pulse
remains unchanged in the undervoltage area. In the overvoltage region, the collector current pulse amplitude will
change with the collector supply voltage VCC. Therefore, collector amplitude modulation must work in an over-voltage state.