Power measurement circuit, chip and communication terminal

A power measurement circuit, comprising a power measurement unit, a reference current generation unit, a voltage-current conversion unit, and an operation output unit, wherein an output end of the power measurement unit is connected to an input end of the voltage-current conversion unit, and output ends of the voltage-current conversion unit and the reference current generation unit are connected to an input end of the operation output unit;

• and
• the power measurement unit comprises a measurement subunit, a measurement sensitivity adjustment subunit, and a low-pass filtering subunit, wherein an input end of the measurement subunit is connected to the to-be-measured radio frequency signal;
• an adjustment end of the measurement subunit is connected to a common end of the measurement sensitivity adjustment subunit;
• an output end of the measurement subunit is connected to an input end of the low-pass filtering subunit;
• an input end of the measurement sensitivity adjustment subunit is connected to an external bandgap reference circuit;
• and an output end of the low-pass filtering subunit is connected to the input end of the voltage-current conversion unit;
• and the power measurement unit comprises a first capacitor, a first NMOS transistor, and a first PMOS transistor;
• one end of the first capacitor is connected to the to-be-measured radio frequency signal;
• the other end of the first capacitor is connected to a gate of the first NMOS transistor;
• the gate and a drain of the first NMOS transistor are connected to each other and are connected to a drain of the first PMOS transistor, the common end of the measurement sensitivity adjustment subunit, and the input end of the low-pass filtering subunit;
• and a source of the first NMOS transistor is grounded;
• a received radio frequency signal to be measured is sequentially calibrated and filtered by using the power measurement unit, to obtain a direct current voltage signal with a specific temperature coefficient;
• the direct current voltage signal is output to the voltage-current conversion unit, to obtain a corresponding direct current;
• and the corresponding direct current is output to the operation output unit;
• and the reference current generation unit generates reference currents with different temperature coefficients, selects, from the reference currents, a reference current with a same temperature coefficient as the direct current, and outputs the reference current to the operation output unit to perform, according to a preset ratio, a superposition operation on the reference current and the corresponding direct current, to obtain an output current irrelevant to a temperature and convert the output current into a corresponding output voltage.