Abstract: A chip scale power semiconductor device (16) provides improved heat dissipation. A semiconductor die (19) is mounted in a first region of a substrate (18). The substrate is extended to a second region for disposing terminals (38) to make external connections to the semiconductor device. Conductors (34) formed on the substrate electrically couple the semiconductor die to the terminals. The substrate is extended for a predetermined distance to separate the second region from the first region for isolating the temperature of the semiconductor die from the local temperature at the terminals.

Abstract: A logic circuit having an emitter-follower output stage utilizes an active pull-down. An inverter stage generates a signal which drives the active pull-down, eliminating the need to identify a complementary signal in a complex logic implementation. A pre-biasing scheme for the active pull-down provides for fast turn on of the active pull-down device while eliminating the temperature and voltage dependency of the pre-biasing function. Power dissipation is minimized by operating the active pull-down and the pre-biasing network from a reduced power supply voltage.

Abstract: A driver circuit that permits full duplex transmission of digital data on a single signal line includes means for enabling a receiver of a station having a transmitter and a receiver to ignore outgoing digital signals from the transmitter of the same station and receive incoming signals. The circuit includes means that combine the incoming and outgoing digital signals in the signal line to form a composite multi-level signal which shifts between predetermined amplitude levels and means that recover the incoming digital signals from the composite signal. An offset bias level is added within the receiver signal processing to the transmitter pulse level to reduce noise susceptibility. Using such a circuit a full duplex transmission system of a plurality of stations connected to a common single signal line is provided. Such a system can be operated in a broadcast mode wherein one station can transmit signals to the remainder of stations.

Abstract: A driver circuit that permits full duplex transmission of digital data on a single signal line includes means for enabling a receiver of a station having a transmitter and a receiver to ignore outgoing digital signals from the transmitter of the same station and receive incoming signals. The circuit includes means that combine the incoming and outgoing digital signals in the signal line to form a composite multi-level signal which shifts between predetermined amplitude levels and means that recover the incoming digital signals from the composite signal. An offset bias level is added within the receiver signal processing to the transmitter pulse level to reduce noise susceptibility. Using such a circuit a full duplex transmission system of a plurality of stations connected to a common single signal line is provided. Such a system can be operated in a broadcast mode wherein one station can transmit signals to the remainder of stations.