Patent ID: 9189005
Filing Date: 2015-11-17
Classification: G05F,H03G,H04W

Abstract:
1. A transmission power control circuit comprising: a frequency conversion unit that converts an input signal to a high frequency signal; a first power control unit that controls power of the input signal before frequency conversion by the frequency conversion unit, in a low frequency band; a second power control unit that controls power of the input signal after frequency conversion by the frequency conversion unit, in a high frequency band; and a controller that controls power using only the first power control unit in a case where a set value of output power is lower than a minimum value of output power at which power control is possible in the second power control unit, the controller controlling the power using the first power control unit and the second power control unit in a case where the set value of the output power is higher than the minimum value of the output power, wherein: the first power control unit includes a first wave detector, the first wave detector detects part of the input signal, and outputs a first wave detection voltage to the controller, the second power control unit includes a second wave detector, the second wave detector detects part of the input signal, and outputs a second wave detection voltage to the controller, and the controller controls power in each of the first power control unit and the second power control unit such that the second wave detection voltage becomes a wave detection voltage target value corresponding to the set value of the output power.