Patent ID: 8810285

Claim:
A semiconductor integrated circuit apparatus comprising: N-number first amplifier circuits that receive a first power signal, that are cascade-connected in order from a first stage circuit to an N-th stage circuit, and that have a first gain; N-number first level detection circuits that are provided for the N-number first amplifier circuits and that output currents in accordance with output levels of the first stage circuit to the N-th stage circuit of the N-number first amplifier circuits; a first adder circuit that adds the output currents from the N-number first level detection circuits to each other to output a first current resulting from addition performed by the first adder circuit; a second level detection circuit that receives the first power signal and outputs a second current in accordance with a level of the first power signal; a synthesizer circuit that generates a third current resulting from multiplication of the first current by a first value and a fourth current resulting from multiplication of the first current by a second value lower than the first value and generates a fifth current resulting from multiplication of the second current by a third value and a sixth current resulting from multiplication of the second current by a fourth value lower than the third value to output current resulting from addition of either of the third current and the fourth current to either of the fifth current and the sixth current; and a current-voltage conversion circuit that converts the output current from the synthesizer circuit into voltage.