Tritech Microelectronics, Ltd

Freesystems Pte Ltd

Chan Chee Oei

Uday Dasgupta

Yap Hwa Seng

Siew Chee Kong

Hongwei Wang

Yu David Hu

A high data-rate infra-red wireless receiver of improved sensitivity utilizing concave reflectors to concentrate said radiation energy on an array of photo-diodes while significantly reducing radio frequency (RF) and visible light interference as well as temperature dependent variations of said photo-diode response.

Infra-red wireless receiver with novel shielding and IR front end signal enhancement

This invention describes an improved design of CMOS. digital input circuits. This improvement reduces the switching level uncertainty range and thus increases the noise margin, compensating for manufacturing process variations. This improvement is achieved by providing resistive compensation devices in series with the P-type and the N-type CMOS transistors in the first stage of a multistage digital input circuit. These resistive devices can be implemented by means of resistors or by means of MOSFET devices which provide the required resistive function. These compensation devices modify the input-output voltage transfer characteristics of the first stage so as to reduce the switching level variation at the input to the circuit. The resulting digital input circuit has a greater tolerance to input noise levels. The improvement provided by this invention is particularly important as integrated circuits design trend is to operate with lower supply voltages.

Design method for compensation of process variation in CMOS digital input circuits

A circuit and a method are disclosed for a power start-up reset circuit which is self-timing and which can be fully integrated in a standard CMOS or BiCMOS process along with other digital circuits. The circuit provides a system reset signal which is issued only after all circuit have stabilized by making the issuance of this system reset signal dependent on an oscillator becoming stable and a subsequent count of a fixed number of system clock cycles derived from that oscillator.

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Singapore, Singapore

Chan Chee Oei