Abstract:
A transistor logic output device is provided with an active element discharging transistor coupled between the base of the pulldown element transistor and ground or low potential for actively controlling a route to ground or low potential for diverting and discharging the so-called capacitive feedback Miller current generated during the low to high potential transition at the output of the device resulting from base-collector junction capacitance in the pulldown element transistor. The active element discharging transistor is controlled at its base by the potential at the collector of the phase splitter element and is coupled to follow changes in voltage at the phase splitter collector for receiving base drive current during the transition from low to high potential at the device output and when the phase splitter is not conducting. The active element thereby provides a low impedance path to ground or low potential at the base of the pulldown element transistor means for diverting and discharging the capacitive Miller feedback current. When the phase splitter is conducting, the active element discharge transistor is deprived of base drive current and affords a high impedance.
Abstract:
A gate circuit is constituted by a plurality of logical elements formed on the same P type semiconductor substrate. Each logical element is composed of an N type first region and P type second region formed by double diffusion in one of a plurality of P type isolated islands formed on a P type semiconductor substrate, and an N type isolating region and N type buried region surrounding the islands. The P type second region, N type first region and P type island constitute a first vertical PNP transistor by operating as an emitter, base and collector, respectively, while the N type first region, P type island and N type buried region constitute a second vertical NPN transistor by operating as an emitter, base and collector, respectively. In the plurality of logical elements, a Schottky diode is provided for each input section thereof. Connected to a connection point between an anode of this Schottky diode and a base of the second vertical NPN transistor of one logical element is a collector of that of another logical element. A collector of the second NPN transistor of one logical element constitutes an output section.
Abstract:
An integrated logic circuit having a novel layout in a semiconductor substrate. The area required for the circuits within the substrate is substantially less than that of prior layouts. Each circuit includes a first device including an elongated impurity region and a set of other impurity regions either in, or in contiguous relationship with, the elongated region; to form a set of diode junctions. The elongated region is capable of containing a predetermined maximum number of the other impurity regions. A second device is located adjacent the narrow side of said first device. A first set of first level conductors extends over the elongated region orthogonally with respect to the elongated direction and are interconnected to selected ones of the other impurity regions. Another conductor is a second level atop the substrate is connected to an impurity region of the second device and extends substantially parallel to the elongated direction. For the most part, this conductor connects the second device with one of the conductors in the first set. The reference potential connections to each circuit are also made preferably by conductive channels running in the same direction. With respect to chip architecture, each logic circuit is of substantially identical identical geometric form and arranged in columnar arrays.
Abstract:
A decoding system comprising a network including a plurality of signal supply terminals respectively corresponding to individual digits in the form of binary code, a signal source generating electric signals of three different values in response to the most significant digit and each corresponding digit, said electric signals being selectively applied to the corresponding signal supply terminals by means of switching circuits.
Abstract:
A current-switching system having an input terminal connected to a resistance, the latter being connectable by a first switch to ground, and connectable by a second switch to a summing junction at the input of an operational amplifier, the two switches being driven so that their conduction states are substantially mutually exclusive, both switches exhibiting substantially zero voltage drops during conduction.
Abstract:
A plurality of diode inputs is connected through a Zener diode clipper and amplifier circuit with a subsequent output stage so that the Zener voltage determines the initial shifting voltage level. To change this initial level, a conventional negator controls a transistor connected in parallel with said clipper and amplifier circuits, and turns off the latter in dependence on the output condition.
Abstract:
A universal logic gate for fabrication as an integrated circuit includes a first input section and a second input section each of which may be selectively chosen for connection to an inverting or output stage. The circuit includes a threshold means so that the response of the output stage is limited to certain signals within predetermined binary voltage ranges. In one embodiment the threshold means takes the form of a biased transistor, and in another embodiment takes the form of a voltage breakdown diode. The circuit also includes a low pass filter network to provide a time delay such that the output stage responds to the input signals only after a predetermined time delay. With fabrication as an integrated circuit, terminal connections are provided such that an external capacitor for governing the time delay may be connected.