| 摘要 |
PROBLEM TO BE SOLVED: To provide a polar loop transmission circuit having only small energy demand, which is suitable for transmission in mobile radio system accompanied by phase modulation and amplitude modulation and transmission in a time slot. SOLUTION: A transmission signal and a feedback signal in the transmission circuit are decomposed into polar elements (phase and amplitude) and they are compared with each other for phase modulation and amplitude modulation. An amplitude modulator AM is placed behind an oscillator VCO and is constituted of a non-linear amplifier operated in a saturation state. An amplifier PV, arranged in a feedback route RK, makes the output signal of the amplitude modulator AM to attenuated. The transmission circuit shows phase modulation and amplitude modulation and is volatile for a future mobile object radio system conforming, for example to known GSM standard.
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