The present application provides a square wave generating method, applied in a square wave generating circuit, configured to generate a mimetic square wave signal, wherein the square wave generating circuit has a breakdown voltage. The square wave generating method comprises the square wave generating circuit generating the mimetic square wave signal as a first voltage during a first time interval; the square wave generating circuit generating the mimetic square wave signal as a second voltage during a second time interval; and the square wave generating circuit generating the mimetic square wave signal as a transient voltage during a transient interval between the first time interval and the second time interval, wherein the transient voltage is between the first voltage and the second voltage; wherein a first voltage difference between the first voltage and the second voltage is greater than the breakdown voltage.

Method and apparatus to produce a step function with a designed transition (rise and/or fall) time on the order of <10 ns that reaches steady state by implementing a system that sums a number of currents at different rise times (frequencies) to generate the step function. The system also includes a passive output filter, composed of low resistance, inductance and very low capacitance to mitigate overshoot and high frequency noise.

A recursive digital sinusoid generator generates recursive values used in the production of a digital sinusoid output. The recursive values are generated at a first frequency. A sinusoid value generator generates replacement values at a second frequency, wherein the second frequency is less than the first frequency. The generated recursive values are periodically replaced with the generated replacement values without interrupting production of the digital sinusoid output at the first frequency. This periodic replacement effectively corrects for a finite precision error which accumulates in the recursive values over time.

A system is provided for generating a ramping signal. The system includes a plurality of storage circuits each including an input and an output. The output of a previous storage circuit is connected to the input of a next storage circuit. The storage circuits are configured to propagate a first enable signal based on a first control signal. The system also includes a plurality of first current generating circuits. Each first current generating circuit is coupled to the output of a corresponding storage circuit to receive the propagated first enable signal. The first current generating circuits are configured to generate a first current signal based on the propagated first enable signal.

A system is provided for generating a ramping signal. The system includes a plurality of storage circuits each including an input and an output. The output of a previous storage circuit is connected to the input of a next storage circuit. The storage circuits are configured to propagate a first enable signal based on a first control signal. The system also includes a plurality of first current generating circuits. Each first current generating circuit is coupled to the output of a corresponding storage circuit to receive the propagated first enable signal. The first current generating circuits are configured to generate a first current signal based on the propagated first enable signal.

An image sensing device includes: a first source ramp voltage generation circuit suitable for generating a first source ramp voltage that is adjusted a first voltage unit for each first period, a second source ramp voltage generation circuit suitable for generating a second source ramp voltage that is adjusted the first voltage unit for each first period and has a set voltage difference from the first source ramp voltage, and a ramp voltage generation circuit suitable for generating a ramp voltage that is adjusted a second voltage unit that is less than the first voltage unit for each second period that is shorter than the first period based on the first and second source ramp voltages and a plurality of first control signals.

A system is provided for generating a ramping signal. The system includes a plurality of storage circuits each including an input and an output. The output of a previous storage circuit is connected to the input of a next storage circuit. The storage circuits are configured to propagate a first enable signal based on a first control signal. The system also includes a plurality of first current generating circuits. Each first current generating circuit is coupled to the output of a corresponding storage circuit to receive the propagated first enable signal. The first current generating circuits are configured to generate a first current signal based on the propagated first enable signal.

A system is provided for generating a ramping signal. The system includes a plurality of storage circuits each including an input and an output. The output of a previous storage circuit is connected to the input of a next storage circuit. The storage circuits are configured to propagate a first enable signal based on a first control signal. The system also includes a plurality of first current generating circuits. Each first current generating circuit is coupled to the output of a corresponding storage circuit to receive the propagated first enable signal. The first current generating circuits are configured to generate a first current signal based on the propagated first enable signal.

A ramp signal generation device includes a sampling circuit suitable for sampling a ramp current, which flows on a plurality of ramp current paths, and storing a voltage corresponding to the sampled ramp current; a current maintaining circuit suitable for maintaining the ramp current; a current maintaining/transferring circuit suitable for maintaining and transferring a current corresponding to the voltage stored by the sampling circuit; a selection circuit suitable for selecting a ramp current path of the sampling block and the current maintaining/transferring circuit; and a current-to-voltage converter suitable for converting the current transferred from the current maintaining/transferring circuit and generating therefrom a ramp voltage.

A ramp signal generation device includes a sampling circuit suitable for sampling a ramp current, which flows on a plurality of ramp current paths, and storing a voltage corresponding to the sampled ramp current; a current maintaining circuit suitable for maintaining the ramp current; a current maintaining/transferring circuit suitable for maintaining and transferring a current corresponding to the voltage stored by the sampling circuit; a selection circuit suitable for selecting a ramp current path of the sampling block and the current maintaining/transferring circuit; and a current-to-voltage converter suitable for converting the current transferred from the current maintaining/transferring circuit and generating therefrom a ramp voltage.