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Abstract

A pulse generator circuit generates pulses or logic signals with variable upper and lower levels. According to a preferred embodiment of this invention there are provided two variable voltage sources representing variable logic state levels. For alternately connecting these voltage sources with the output of the circuit there is provided a diode bridge in the configuration of a Graetz rectifier with two nodes connected to these voltages sources and the other two nodes forming complementary output signals; these latter two nodes are also connected to equal and opposite constant current sources which are reversible in accordance with a control signal. The voltage sources are coupled to the bridge via operational amplifiers configured as voltage followers. In each associated feedback loop of the voltage sources there is a diode substantially identical to those of the bridge which is coupled to a constant current source equal in magnitude to those of the constant current sources connected to the bridge. The directions of the diodes in the feedback loops are chosen so that the voltage drops in the feedback loops compensate for the voltage drops in the diode bridge, thereby providing complementary output signals which are a true representation of the magnitude of the voltage sources.

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First Claim