Provided is a semiconductor integrated circuit including a pad Pd1 provided on one end side of a resistive element R1 externally provided, a pad Pd5 provided on a different end side of the resistive element R1; an operation amplifier A1, a signal line L11 wired between an output terminal of the operation amplifier A1 and the pad Pd1, a signal line L21 wired between an inverting input terminal of the operation amplifier A1 and the pad Pd5, a ESD protection element r11 provided to the signal line L11, and a signal line L31, through which a voltage signal of the pad Pd1 is transmitted. The signal line L31 is connected to the pad Pd1.

Provided is a semiconductor integrated circuit including a pad Pd1 provided on one end side of a resistive element R1 externally provided, a pad Pd5 provided on a different end side of the resistive element R1; an operation amplifier A1, a signal line L11 wired between an output terminal of the operation amplifier A1 and the pad Pd1, a signal line L21 wired between an inverting input terminal of the operation amplifier A1 and the pad Pd5, a ESD protection element r11 provided to the signal line L11, and a signal line L31, through which a voltage signal of the pad Pd1 is transmitted. The signal line L31 is connected to the pad Pd1.

A device for processing an input signal, including a local oscillator, designed to generate an oscillator signal; a subtracting unit, designed to subtract an amplified correction signal from the input signal in order to generate a corrected input signal; a downmixer, designed to mix the corrected input signal downward to an intermediate frequency using the oscillator signal in order to generate a difference signal; a first amplifier unit, designed to amplify the difference signal in order to generate and output an output signal; a correcting unit, designed to suppress a predefined frequency range of the output signal in order to generate a correction-difference signal; an upmixer, designed to mix the correction-difference signal upward using the oscillator signal in order to generate a correction signal; and a second amplifier unit, designed to amplify the correction signal in order to generate the amplified correction signal.

A device for processing an input signal, including a local oscillator, designed to generate an oscillator signal; a subtracting unit, designed to subtract an amplified correction signal from the input signal in order to generate a corrected input signal; a downmixer, designed to mix the corrected input signal downward to an intermediate frequency using the oscillator signal in order to generate a difference signal; a first amplifier unit, designed to amplify the difference signal in order to generate and output an output signal; a correcting unit, designed to suppress a predefined frequency range of the output signal in order to generate a correction-difference signal; an upmixer, designed to mix the correction-difference signal upward using the oscillator signal in order to generate a correction signal; and a second amplifier unit, designed to amplify the correction signal in order to generate the amplified correction signal.

A device for processing an input signal, including a local oscillator, designed to generate an oscillator signal; a subtracting unit, designed to subtract an amplified correction signal from the input signal in order to generate a corrected input signal; a downmixer, designed to mix the corrected input signal downward to an intermediate frequency using the oscillator signal in order to generate a difference signal; a first amplifier unit, designed to amplify the difference signal in order to generate and output an output signal; a correcting unit, designed to suppress a predefined frequency range of the output signal in order to generate a correction-difference signal; an upmixer, designed to mix the correction-difference signal upward using the oscillator signal in order to generate a correction signal; and a second amplifier unit, designed to amplify the correction signal in order to generate the amplified correction signal.

A circuit and a method for maintaining the desired tone, harmonic relationship and dynamic response of a musical instrument amplifier throughout the complete master volume power attenuation range.

A semiconductor integrated circuit includes a first pad provided on one end side of a first resistive element externally provided, a second pad provided on a different end side of the first resistive element, an operation amplifier, a first signal line wired between an output terminal of the operation amplifier and the first pad, a second signal line wired between one input terminal of the operation amplifier and the second pad, a first ESD (Electrostatic Discharge) protection element provided to the first signal line, and a third signal line, through which a voltage signal of the first pad is transmitted, the third signal line being connected to the first pad, and a second switch, which is selectively turned on, the second switch being provided on the third signal line.

A semiconductor integrated circuit includes a first pad provided on one end side of a first resistive element externally provided, a second pad provided on a different end side of the first resistive element, an operation amplifier, a first signal line wired between an output terminal of the operation amplifier and the first pad, a second signal line wired between one input terminal of the operation amplifier and the second pad, a first ESD (Electrostatic Discharge) protection element provided to the first signal line, and a third signal line, through which a voltage signal of the first pad is transmitted, the third signal line being connected to the first pad, and a second switch, which is selectively turned on, the second switch being provided on the third signal line.

A semiconductor integrated circuit includes a first pad provided on one end side of a first resistive element and one end side of a second resistive element externally provided, a second pad provided on a different end side of the first resistive element, a third pad provided on a different end side of the second resistive element and one end side of a third resistive element externally provided, an operation amplifier, a first signal line, wired between an output terminal of the operation amplifier and the first pad, a second signal line wired between an inverting input terminal of the operation amplifier and the second pad, a third signal line wired between the inverting input terminal of the operational amplifier and the third pad, a first ESD protection element, provided to the first signal line, a fourth signal line, through which a voltage signal of the first pad.

A semiconductor integrated circuit includes a first pad provided on one end side of a first resistive element and one end side of a second resistive element externally provided, a second pad provided on a different end side of the first resistive element, a third pad provided on a different end side of the second resistive element and one end side of a third resistive element externally provided, an operation amplifier, a first signal line, wired between an output terminal of the operation amplifier and the first pad, a second signal line wired between an inverting input terminal of the operation amplifier and the second pad, a third signal line wired between the inverting input terminal of the operational amplifier and the third pad, a first ESD protection element, provided to the first signal line, a fourth signal line, through which a voltage signal of the first pad.