Radio frequency power amplifier

A radio frequency (RF) power amplifier comprising:

• a number (N) of amplifying stages, each receiving a respective RF input signal and outputting a respective RF output signal, where N≧1;
• when N≧2, said amplifying stages being cascaded, and the respective RF output signal outputted by an nth one of said amplifying stages serving as the respective RF input signal received by an (n+1)th one of said amplifying stages, where 1≦n≦(N−1);
• each of first to Mth ones of said amplifying stages includes
• a first amplifying module receiving a first RF to-be-amplified signal, and performing power amplification on the first RF to-be-amplified signal to generate the respective RF output signal,
• an input module coupled to said first amplifying module, and receiving the respective RF input signal, and
• a feedback module coupled to said first amplifying module and said input module, and receiving the respective RF output signal from said first amplifying module, said feedback module cooperating with said input module to provide, based on the respective RF input signal and the respective RF output signal, the first RF to-be-amplified signal for said first amplifying module, said feedback module cooperating with said first amplifying module to form a positive feedback loop that provides a loop gain which is less than one,
• where 1≦M≦N.