Semiconductor device

A semiconductor device comprising:

• a baseband processing circuit performing a processing in a baseband of wireless communication;
• a high-frequency circuit performing a processing in a high-frequency band of the wireless communication, and including a high-frequency transmission circuit processing a transmission signal and a high-frequency reception circuit processing a reception signal by use of an analog-digital conversion unit;
• and
• a processor connected to the baseband processing circuit via a bus,
• wherein the analog-digital conversion unit includes:
• a voltage quantizer circuit converting differential input voltages to be applied to differential input nodes, into a digital signal with a plurality of bits for every sampling period, and asserting a conversion end signal when completing a conversion operation;
• a correction code decision circuit being electrically connected to the voltage quantizer circuit and receiving the conversion end signal as its input output from the voltage quantizer circuit;
• and
• a common-mode voltage regulator circuit electrically connected to the correction code decision circuit and the voltage quantizer circuit,
• the voltage quantizer circuit includes:
• a first comparator including a first input transistor receiving the differential input voltages as its input, and defining a value of a first bit of the digital signal;
• and
• a second comparator including a second input transistor receiving the differential input voltages as its input, being different from the first input transistor, and defining a value of a second bit of the digital signal,
• the correction code decision circuit decides a correction code for correcting a common-mode voltage of the differential input voltages, based on the conversion end signal output from the voltage quantizer circuit, and
• the common-mode voltage regulator circuit regulates the common-mode voltage by adding or subtracting a corrected voltage based on the correction code to or from the differential input voltages.