Abstract: A bias circuit that generates a dynamic bias voltage for driving low-voltage transistors in an output buffer that interfaces with high-voltage signals is disclosed. Various circuits have been devised to ensure that no transistor in the bias and the output buffer circuitry undergoes voltages higher than that allowed by the fabrication process, even though the output signal voltage may swing well beyond the tolerable voltage levels. This is accomplished with minimal increase in power consumption and without compromising the speed of operation of the output buffer circuit.

Abstract: PC Add-On Card for controlling consumer grade VHS-VCR(s) comprising address decoding section and bidirectional buffer connected to I/O ports for interchanging data between computer and VHS-VCR(s) through digital switching control and to counter section for counting tape positioning pulses from the VHS-VCR(s) through analog multiplexer section. The digital switching control section and analog function switching control electronically control the functions of VHS-VCR(s) through the analog multiplexer section interactively. This Card may be used for integrating real time analog video from a built-in VHS-VCR and animation from the computer in Analog Video Interactive Equipment.