Nortel Networks Corporation

Northern Telecom Limited

International Standard Electric Corporation

Andrew Paul Lefevre

Peter F Blomley

Edward J Whittaker

Kenneth A Arton

A charge transfer circuit for an imaging array incorporates a number of concatenated charge transfer stages. Each stage has a charge storage element for storing accumulated charge generated by a photo-detector responsive to electromagnetic radiation incident thereon, and a transfer element to which the charge storage element is coupled. A first voltage driver is coupled to the storage element and a second voltage driver coupled to the transfer element. By selectively applying respective potential conditions to the storage elements and to the transfer elements of each stage of the array the accumulated charge stored in each storage element is transferred to the storage element of the next stage of the array to provide an integrated signal at the circuit output.

Charge transfer circuit for use in imaging systems

A charge integration circuit incorporates first and second capacitors, and first and second reference voltage supplies. A first switch controls integration of charge in the first capacitor and selectively resets the first capacitor to the first reference voltage. A second switch selectively resets the second capacitor to the first reference voltage. A current mirror coupled to the capacitors effects discharge of the second capacitor by a quantity of charge equivalent to the charge integrated on the first capacitor so as to effectively transfer charge therebetween at the end of an integration period.

Time delay charge integration circuit

An integrated circuit for a telephone instrument provides the basic (POT) service requirement. The transmit and receive channels of the circuit may be fed via controlled attenuators incorporated in a first ancillary circuit to provide hands-free operation. The circuit also includes a current-limited power supply whereby connection to a second ancillary circuit, including an audio amplifier, may be effected to provide loudspeaker operation.

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Dunmow, United Kingdom

Andrew Paul Lefevre