Abstract: According to one embodiment, a phase adjuster operates according to a phase difference between a first clock signal and a second clock signal. The adjuster includes an adjustment driving element and a crosstalk driving element. The adjustment driving element drives an input signal and generates an adjusted signal. The crosstalk driving element generates an in-phase and/or a reverse-phase crosstalk signal in parallel to the adjusted signal when the phase difference occurs between the first clock signal and the second clock signal.

Abstract: A semiconductor device having a current control circuit includes: a current source; a capacitor charged by the current output from the current source; a switch circuit for controlling charge and discharge of the capacitor; a voltage comparator for comparing the voltage of the charged capacitor with a reference voltage; and a control circuit for creating a control signal based on a result of comparison, feeding back the control signal to the current source so that the voltage of the capacitor is made near to the reference voltage as well as controlling a reference current output to the outside by the control signal.

Abstract: An impedance adjusting circuit for setting accurate impedance ratio has a plurality of paths each having impedance adjusting section which is a serially connected switch element and impedance element. A synthesized impedance of an ON resistance of the switch element and impedance of the impedance element in each impedance adjusting section is set to have a predetermined proportional relation. This enables accurate trimming without generating peak level variation of frequency characteristic when applied to a filter.

Abstract: Non-inverting input terminals of first and second operational amplifiers having the same characteristics are connected together. A first circuit is connected between the inverting input terminal of the first operational amplifier and a first signal input terminal. A second circuit is connected between the non-inverting input terminal of the first operational amplifier and the first signal input terminal. The first circuit receives a feedback signal from an output terminal of the first operational amplifier. The second circuit is connected to a reference voltage source. A third circuit is connected between the inverting input terminal of the second operational amplifier and a second signal input terminal. A fourth circuit is connected between the non-inverting input terminal of the second operational amplifier and the second signal input terminal. The third circuit receives a feedback signal from an output terminal of the second operational amplifier.