Abstract: A single stage voltage to current conversion switching system which includes an input terminal for receiving an input signal voltage to be converted to a current, an output terminal, and a positive channel having a first operational amplifier with a reference input and a summing input. The summing input receives the input voltage signal and introduces a first offset voltage to the input signal voltage. There is a first semiconductor circuit connected to the output of the first operational amplifier to provide a first offset current signal. There are first switching means interconnected with the first semiconductor circuit to deliver the first offset current signal to the output terminal. There is a negative channel having a second operational amplifier with a reference and a summing input that receives the input voltage signal and introduces a second offset signal to the input signal voltage.

Abstract: A variable pulse width precision pulse generator includes a constant current source for producing a number of different constant currents; a charge storage device whose voltage output is proportional to the charge stored; and gating means responsive to an input signal for controlling the time during which the constant current source charges the charge storage device to produce a ramp voltage; a first comparator responsive to the voltage ramp for detecting a first level of the ramp; a second comparator responsive to the voltage ramp for detecting a second level of the ramp; and logic means responsive to the comparators for providing a precision pulse during the presence of the input signal between the occurrence of the detection of the first and second levels of the ramp by the comparators.

Abstract: A voltage to current conversion switching system includes an input terminal for receiving input signal voltage to be converted to a current; an output terminal; a first, positive channel having a first offset amplifier for introducing a positive offset to the input signal; a first voltage to current amplifier responsive to the first offset amplifier; and first switching means responsive to the first voltage to current amplifier to provide a first offset current signal to the output terminal; a second, negative channel has a second offset amplifier for introducing a negative offset to the input signal; a second voltage to current amplifier responsive to the second offset amplifier; and second switching means responsive to the second voltage to current amplifier to provide a second equal and opposite offset current signal to the output terminal to compensate for the temperature drift and switching current injection in the first and second offset current signals; and drive means for actuating the first and secon

Abstract: The signal amplifier is used for amplification of an input signal with varying control amplitude, particularly in the field of electromedicine. The amplifier contains at least two amplification paths which supply current to the deflection coil of the recording device. In the first path is arranged a first individual amplifier which is designed as a voltage-controlled current source. It is rated for a lower control range. This lower range is chosen to be the range in which the input signal lies during relatively long periods of time. In the second path is arranged a second individual amplifier. This amplifier is designed as a voltage amplifier. It is rated for a higher control range and supplies the deflection coil with peak current during relatively short periods of time.

Abstract: A composite signal is transmitted via a transmission line to an x, y, z display device. The composite signal contains in each of a plurality of predetermined time intervals an identifiable signal. The first signal of said composite signal is a synchronizing start signal. The other signals contain varying information. In the display device there are generated an x-, a y- and a z-coordinate signal. These coordinate signals are generated such that in said predetermined time intervals with reference to the synchronizing start signal and in predetermined varying combinations two of these three coordinate signals are developed and determined by the display device, whereas the remaining third coordinate signal is developed by the display device, but is determined from one of the other signals of the composite signal received via the transmission line.

Abstract: In signal measurement circuits which are referred to a floating ground and which derive their input signals from electrodes attached to a patient's body, the effects of common mode potentials on the patient's body are minimized without requiring any patient electrodes other than those acting as signal sources, by using an operational amplifier to drive the floating ground toward the common mode potential on the patient's body.This process is accomplished without significantly degrading the isolation impedance between the measurement circuits and true ground.The patient is protected from hazardous electrical shock by incorporating a current limiting impedance in the amplifier circuit.