Abstract: Provided is a transistor protection circuit capable of appropriately protecting a transistor even when a switching frequency is high. A transistor protection circuit according to an embodiment of the present invention is a transistor protection circuit for protecting a voltage-driven transistor that is switch-controlled by the application of a high-potential-side voltage or low-potential-side voltage of a power supply to a gate terminal of the transistor by a drive circuit. The transistor protection circuit has a power supply controller that gradually lowers the high-potential-side voltage of the power supply upon receiving a protection command for executing protection of the transistor.

Abstract: A switching circuit 33 comprises a connection circuit cascade-connecting control terminals for controlling switching of n number of transistors M1-Mn via n?1 number of coils L1 respectively (n is an integer equal to or more than 2; and coils L3 respectively connected between one end of each of the transistors M1-Mn and other end of a coil L2, one end of the coil L2 being electrically connected to a DC power source. The transistors M1-Mn is sequentially switched with PWM signals inputted to an input terminal of the connection circuit. The switching circuit 33 further comprises a transistor M0 inserted at the one end or the other end of the coil L2 in cascade-connection.

Abstract: A switching circuit according to one embodiment has: N switching elements; a connection circuit including N?1 first inductance elements that are connected in series; a second inductance element; and N third inductance elements. Control terminals of the N switching elements are connected to ends of the connection circuit and connection contacts, respectively. One end of the second inductance element is connected to a power supply. The N third inductance elements electrically connects one ends of the N switching elements and the other end of the second inductance element with each other, respectively.

Abstract: A switching circuit according to one embodiment includes first to fourth semiconductor switch elements. A pulse-like signal is applied to each input terminal of the switch elements such that when the first and fourth switch elements are in an ON (OFF) state, the remaining switch elements are in an OFF (ON) state. The switching circuit includes first and second capacitance elements. The first capacitance elements connected between an output terminal of the second semiconductor switch element and the second capacitance elements connected between an input terminal of the second semiconductor switch element and an output terminal of the fourth semiconductor switch element has a capacitance to reduce a parasitic capacitance between the input and output terminals of each of the fourth and second switch elements at a frequency N times (N is an integer of 1 or more) as high as a clock frequency of the pulse-like signal.

Abstract: A switching circuit according to one embodiment is a switching circuit including at least one semiconductor switch element having an input, output, and a common terminals, a pulse-like signal being applied between the input and common terminals to switch a current between the output and common terminals. The switching circuit further includes a capacitance suppression element section connected at least one of between the input and output terminals, between the input terminal common terminals, and between the output and common terminals. The capacitance suppression element section reduces a parasitic capacitance between the terminals of the semiconductor switch element where the capacitance suppression element section is connected to less than that obtained when the capacitance suppression element section is not connected at a frequency N times (N is an integer of 1 or more) as high as a clock frequency of the pulse-like signal.

Abstract: A switching circuit according to one embodiment includes: a switching element that has a first terminal and a second terminal, and is driven by a pulse signal to switch a conduction state between the first and second terminals; a power source section that supplies a voltage to the first terminal; a load circuit that is connected in parallel with the power source section; a passive circuit section that is connected between a connection point between the power source section and the load circuit, and the first terminal, and suppresses a current flowing from the connection point to the switching element at a frequency N times (N is an integer of 1 or more) as high as a clock frequency of the pulse signal; and a resonant circuit section that is connected between the passive circuit section and the connection point, and resonates at the frequency of N times.

Abstract: A switching circuit according to one embodiment has: N switching elements; a connection circuit including N?1 first inductance elements that are connected in series; a second inductance element; and N third inductance elements. Control terminals of the N switching elements are connected to ends of the connection circuit and connection contacts, respectively. One end of the second inductance element is connected to a power supply. The N third inductance elements electrically connects one ends of the N switching elements and the other end of the second inductance element with each other, respectively.

Abstract: A switching circuit according to one embodiment includes: a switching element that has a first terminal and a second terminal, and is driven by a pulse signal to switch a conduction state between the first and second terminals; a power source section that supplies a voltage to the first terminal; a load circuit that is connected in parallel with the power source section; a passive circuit section that is connected between a connection point between the power source section and the load circuit, and the first terminal, and suppresses a current flowing from the connection point to the switching element at a frequency N times (N is an integer of 1 or more) as high as a clock frequency of the pulse signal; and a resonant circuit section that is connected between the passive circuit section and the connection point, and resonates at the frequency of N times.

Abstract: A switching circuit according to one embodiment is a switching circuit including at least one semiconductor switch element having an input, output, and a common terminals, a pulse-like signal being applied between the input and common terminals to switch a current between the output and common terminals. The switching circuit further includes a capacitance suppression element section connected at least one of between the input and output terminals, between the input terminal common terminals, and between the output and common terminals. The capacitance suppression element section reduces a parasitic capacitance between the terminals of the semiconductor switch element where the capacitance suppression element section is connected to less than that obtained when the capacitance suppression element section is not connected at a frequency N times (N is an integer of 1 or more) as high as a clock frequency of the pulse-like signal.

Abstract: A switching circuit according to one embodiment includes first to fourth semiconductor switch elements. A pulse-like signal is applied to each input terminal of the switch elements such that when the first and fourth switch elements are in an ON (OFF) state, the remaining switch elements are in an OFF (ON) state. The switching circuit includes first and second capacitance elements. The first capacitance elements connected between an output terminal of the second semiconductor switch element and the second capacitance elements connected between an input terminal of the second semiconductor switch element and an output terminal of the fourth semiconductor switch element has a capacitance to reduce a parasitic capacitance between the input and output terminals of each of the fourth and second switch elements at a frequency N times (N is an integer of 1 or more) as high as a clock frequency of the pulse-like signal.

Abstract: An input signal (Vin) is divided into n (?3) number of divided signals which are weighted by first weights (ki). The weighted divided signals are processed by n number of signal processing means 1 to n performing the same signal processing. The processed divided signals are weighted by second weights (li) and added to obtain an output signal (Vout). By selecting the first weights (ki) and the second weights (li), it is possible to eliminate noise or eliminate distortion.

Abstract: A voltage-to-current conversion circuit composed of MOSFETs of the same polarity and an OTA with Rail-to-Rail with a simple configuration that uses the same have been disclosed. The voltage-to-current conversion circuit comprises a first MOSFET, to which a fixed drain-source voltage is applied all the time, and which generates a first current signal for an input voltage, a second MOSFET, which has the same polarity as that of the first MOSFET, to which the fixed drain-source voltage is applied all the time, and which generates a second current signal complementary to the first current signal for the input voltage, and a difference current operation circuit that performs the operation of subtraction between the first current signal and the second current signal, thereby an output current is generated in accordance with the input voltage.

Abstract: A voltage-to-current conversion circuit composed of MOSFETs of the same polarity and an OTA with Rail-to-Rail with a simple configuration that uses the same have been disclosed. The voltage-to-current conversion circuit comprises a first MOSFET, to which a fixed drain-source voltage is applied all the time, and which generates a first current signal for an input voltage, a second MOSFET, which has the same polarity as that of the first MOSFET, to which the fixed drain-source voltage is applied all the time, and which generates a second current signal complementary to the first current signal for the input voltage, and a difference current operation circuit that performs the operation of subtraction between the first current signal and the second current signal, thereby an output current is generated in accordance with the input voltage.

Abstract: A semiconductor integrated circuit comprises an amplifier circuit including a current output amplifier, a load resistor having one end connected to an output terminal of the current output amplifier and a voltage control circuit having an input terminal connected to the one end of the load resistor and an output terminal connected to an other end of the load resistor. The input terminal of the amplifier circuit serves as an input terminal of the current output amplifier, and the output terminals of the amplifier circuit serve as the individual ends of the load resistor.

Abstract: A semiconductor integrated circuit comprises an amplifier circuit including a current output amplifier, a load resistor having one end connected to an output terminal of the current output amplifier and a voltage control circuit having an input terminal connected to the one end of the load resistor and an output terminal connected to an other end of the load resistor. The input terminal of the amplifier circuit serves as an input terminal of the current output amplifier, and the output terminals of the amplifier circuit serve as the individual ends of the load resistor.