Am transmitter and modulation method using same

Details Am transmitter and modulation method using same Am transmitter and modulation method using same

H - Electricity

04

B

H04B 1/04 (2006.01) H03C 1/02 (2006.01) H03C 1/06 (2006.01) H03F 3/68 (2006.01) H03G 3/20 (2006.01)

Patent

CA 2636481

An AM (Amplitude-Modulated) transmitter capable of improving modulation distortion is provided. An adder adds a modulation signal to a pre-set power reference signal. An APC (Automatic Power Control) amplifier compares a level of a detecting signal outputted by the LPF (Low Pass Filter) with a level of an adder signal. The APC amplifier, based on the comparison result, generates a gain controlling signal that makes a difference between a level of the detecting signal and level of the signal approach zero and feeds the gain controlling signal to a power amplifier. The power amplifier modulates the signal outputted from the amplifier by the gain controlling signal and power-amplifies the modulated signal according to a level of the gain controlling signal. Since the APC amplifier feeds the gain controlling signal to the power amplifier, a modulation degree does not depend on a nonlinear distortion characteristic of the power amplifier.

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