A substrate bias potential generator for biasing a semiconductor substrate to a predetermined potential includes first and second substrate bias generating circuits which operate alternatively according to the potential of the substrate, whereby consumption of power in the substrate bias potential generator is reduced. The alternative operation of the bias generating circuits each activated by a pulse signal train is performed by using a first insulated gate transistor having a gate electrode connected to the semiconductor substrate, a second insulated gate transistor having a gate electrode for receiving the reference potential, an amplifier for differentially amplifying outputs of the first and second insulated gate transistors, an insulated gate transistor for charging an output of the amplifier to a predetermined potential when the amplifier is activated, and a circuit for transmitting the output of the differential amplifier to the first and second bias potential generating circuits. The differential amplifier is activated in response to an activation signal of a pulse train whereby an activation signal corresponding to the pulse train is transmitted to either substrate bias potential generating circuit.

Substrate bias potential generator of a semiconductor integrated circuit device and a generating method therefor

Elektronisch gesteuerte naehmaschine

In a variable high-voltage generating circuit for an avalanche photodiode, a pulse oscillating circuit generates pulses, a current driving circuit current-amplifies the pulses, a Cockcroft-Walton circuit boosts and rectifies the pulses from the current driving circuit, and a low-pass filter is connected at the output of the Cockcroft-Walton circuit. The avalanche photodiode is connected in series with a first resistor, and the series connection is connected to receive the output of the low-pass filter. A series connection of a transistor and a second resistor is connected in parallel with the series connection of the avalanche diode and the first resistor. A control circuit applies a variable signal to the base of the transistor, thereby to vary the voltage applied across the APD.

Variable high-voltage generating circuit

A DC voltage converter includes an oscillator that converts a DC battery voltage to an oscillating voltage, a low voltage transformer that increases the oscillating voltage to a higher oscillating voltage, and a voltage rectifying-capacitor charging network that increases the higher oscillating voltage to yet a higher DC voltage at an output terminal for DC high voltage utilization devices and the like An electric switch portion is selectively actuated by the user to apply the battery voltage to the oscillator, resulting in the generation of the stepped-up DC voltage at the output terminal Utilization devices for the voltage developed by the converter shown are a miniature animal training device and a cattle prod device The miniature animal training device has a pair of outwardly projecting electrodes mounted on a side at one end of the housing that is sized and shaped to fit within and conform to the palm of a hand The batteries, converter and electric switch portion are contained in the housing whereby the device produces a stepped-up DC voltage at said output terminal upon the depression of one of the electrodes as both electrodes are pressed against an object to be electrically shocked The cattle prod device has a pair of electrodes mounted on the end of a housing assembly made up of telescoping tubular housing sections with one housing section containing the batteries, converter and electric switch portion whereby the pressing of the electrodes against an object to be shocked causes a shock of the object The housing assembly is releasably supported by a rigid handle or an extensible handle assembly

Dc voltage converter and shock-type high voltage utilization

A high-voltage generating circuit suitable for a light receiving circuit includes a pulse oscillating circuit, a current drive circuit, a first capacitor, a second capacitor, a Cockcroft-Walton circuit, a low-pass filter. The pulse oscillating circuit produces a train of repetitive pulses. The current drive circuit produces a train of repetitive pulses which are in phase opposite to the train of repetitive pulses. The first capacitor couples the current drive circuit with the first input terminal of the Cockcroft-Walton circuit. The second capacitor couples the pulse oscillating circuit with the second input terminal of the Cockcroft-Walton circuit. The Cockcroft-Walton circuit boost the pulse voltage applied between the first and second inputs to produce a high direct current voltage. The low-pass filter removes the ripple components of the high direct current voltage. The Cockcroft-Walton circuit can be formed with a small number of circuit components.

High voltage generating circuits including a transformerless voltage multiplier

A high voltage dc stepping power supply for sampling a utilization device such as an electrostatic analyzer has a relatively fast settling time for voltage steps The supply includes a waveform generator for deriving a low voltage staircase waveform that feeds a relatively long response time power supply deriving a high output voltage generally equal to a predetermined multiple of the input voltage In the power supply, an ac voltage modulated by the staircase waveform is applied to a step-up transformer and thence to a voltage multiplier stack to form a high voltage, relatively poor replica of the input waveform at an intermediate output terminal A constant dc source, applied to the input of the power supply, biases the voltage at the intermediate output terminal to be in excess of the predetermined multiple of the input voltage A fast shunt regulator responsive to the input signal provides an output which is a faithful high voltage reproduction of the staircase waveform The shunt regulator includes a solid state shunt device connected to the intermediate output terminal via a dropping resistor The supply output is taken from the junction of the resistor and the shunt device

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Acuna Mario H

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Controllable high voltage source having fast settling time