An operational amplifier with a broad applicable band and little disturbing noise which is capable of preventing oscillation even when used in connection with a negative feedback path. The operational amplifier amplifies a difference between two input voltage signals to a non-inverting input terminal and an inverting input terminal and outputs the amplified difference to an output terminal. The operational amplifier includes an input voltage/current conversion stage which outputs, to the non-inv...

An operational amplifier includes: a differential amplifier circuit configured to receive an inverting input voltage (VIN-) and a non-inverting input voltage (VIN+); and an auxiliary circuit for improving a slew rate of an output voltage of the differential amplifier circuit, wherein when a voltage difference between the inverting input voltage (VIN-) and the non-inverting input voltage (VIN+) is less than a predetermined small voltage difference, an output terminal of the auxiliary circuit is d...

A current mode operational amplifier is shown which is powered by a single voltage supply and operates in response to input signals represented by current values. The input system for the operational amplifier employs an inverting input circuit responsive to a first input signal and a non-inverting input circuit responsive to a second input signal. A current mirror circuit is employed for subtracting one input signal from the second input signal and the difference signal is applied to the operat...

An operational transconductance amplifier comprises first and second transistors connected in a gain-controlled emitter-coupled differential amplifier configuration and provided active collector loads by the input ports of a first and a second current mirror amplifiers, respectively. The balanced signals appearing at the output ports of the first and the second current mirror amplifiers in response to the balanced signal variations in the collector currents of the first and second transistors ar...

An operational table for medical purposes has a number of elements movable independently from each other by a hydraulic system. The invention is particularly characterized by the provision of a central valve operating unit having a plurality of valves which can be selectively consecutively actuated by a single central lever in such manner that they produce a hydraulic connection between operating cylinders working with them and the pressure producing system, the cross-section of which depends up...

A high power operational amplifier circuit using a differential amplifier device of the 741-type, which circuit includes a complementary pair of Darlington output transistors, a resistance-diode biasing network for each of said transistors and a capacitance connected across the power pins of the differential amplifier, the values of the resistances of the biasing networks and the latter capacitance being selected to prevent cross-over distortion and to provide thermal stability, the latter being...

This hybrid circuit utilizes two amplifiers such as operational amplifiers without transformers. A bridge arrangement is used in which there are four impedances, the line being one impedance. One amplifier is the second amplifier which is connected across two points of the bridge as a differential amplifier. The other amplifier is the first amplifier which is connected across the other two points of the bridge. One wire of the line acts as a common point for the bridge and the amplifier system. ...

A camera control system in which one or more slave cameras are made to follow the motional and/or optical (zoom) adjustments of a master camera. Each motional or optical parameter is represented by a train of pulses related to the master camera, which pulses are digitally processed. Corrections to a parameter to insure accurate synchronous tracking are made by changing the effective number of pulses in a train of pulses according to a predetermined correction program. The corrected pulse trains ...

A non-linear operational circuit with reference voltage sources and switching means, wherein the output voltage of the operational circuit is compared with the reference voltages to open and close the switching means in accordance with their magnitudes relative to one another and thereby to non-linearly vary the output voltage of the operational circuit in response to changes in the input voltage. The reference voltage sources and the switching means are connected in series between the output te...

A thermal drift compensation circuit for operational amplifiers wherein a second operational amplifier is utilized to sense the error voltage between the input terminals of a first operational amplifier and generate a current therefor which compensates for errors resulting from thermal effects within the first operational amplifier.