Patent ID: 8063682

Claim:
A semiconductor circuit comprising: a signal processing circuit that includes a first signal processor configured to receive a signal on its input terminal, to perform predetermined signal processing on the signal to provide a change to at least one of the characteristic values thereof, and to output the signal thus processed from its output terminal being different from its input terminal, and a second signal processor provided in the subsequent stage of the first signal processor and configured to receive the signal from the output terminal of the first signal processor on its input terminal, to perform predetermined signal processing on the signal on its input terminal, to provide a change to a characteristic value thereof, and to output the signal thus processed from its output terminal being different and separate from its input terminal, wherein an amount of change provided to the characteristic value of the signal by one of the first and second signal processors is dependent on a voltage level of a power supply voltage, and an amount of change provided to the characteristic value of the signal by the other of the first and second signal processors is configured to be adjustable; and a control circuit that monitors a power supply voltage supplied to said one of the first and second signal processors and adjusts in accordance with the voltage level of the power supply voltage the amount of change provided to the characteristic value of the signal by the said other of the first and second signal processors.