A semiconductor circuit device includes a current detecting circuit that converts an inductor current into a voltage and outputs the voltage as a current detection voltage, a differential amplifier circuit that amplifies a difference between a voltage corresponding to the output voltage and a reference voltage, a level shifter, and a comparing circuit that compares the current detection voltage with a level-shifted voltage and outputs a switching signal for a switching device. The differential amplifier circuit includes a MOS transistor provided between a power supply node and an output node. The level shifter level-shifts a voltage at the output node of the differential amplifier circuit to a low potential side and outputs the level-shifted voltage.

An example apparatus includes: a first transistor having a first terminal and a control terminal; a second transistor having a first terminal and a control terminal, the first terminal of the second transistor coupled to the first terminal of the first transistor; a third transistor having a first terminal and a control terminal; a fourth transistor having a first terminal and a control terminal, the first terminal of the fourth transistor coupled to the first terminal of the third transistor; feedback circuitry coupled to the first transistor, the second transistor, the third transistor and the fourth transistor; current source circuitry having a first terminal and a second terminal, the first terminal of the current source circuitry coupled to the feedback circuitry; slew assist circuitry coupled to the first transistor, the second transistor, the third transistor and the fourth transistor, the feedback circuitry and the current source circuitry.

The present disclosure provides for transimpedance amplifiers for crossbar circuits. A crossbar circuit may include a plurality of bit lines intersecting with a plurality of word lines and a plurality of cross-point devices. Each of the plurality of the cross-point devices is connected to at least one of the word lines and at least one of the bit lines. The crossbar circuit may further include a transimpedance amplifier to generate an output voltage representative of a sum of currents flowing through a first bit line of the plurality of bit line. The transimpedance amplifier may include an operational amplifier, a current mirror circuit connected to an output of the operational amplifier, and one or more resistors connected to the current mirror circuit and a supply voltage.

The present disclosure provides for transimpedance amplifiers for crossbar circuits. A crossbar circuit may include a plurality of bit lines intersecting with a plurality of word lines and a plurality of cross-point devices. Each of the plurality of the cross-point devices is connected to at least one of the word lines and at least one of the bit lines. The crossbar circuit may further include a transimpedance amplifier to generate an output voltage representative of a sum of currents flowing through a first bit line of the plurality of bit line. The transimpedance amplifier may include an operational amplifier, a current mirror circuit connected to an output of the operational amplifier, and one or more resistors connected to the current mirror circuit and a supply voltage.