Open-Loop Transimpedance Amplifier for Infrared Diodes

a transimpedance amplifier and diode technology, applied in the field of infrared receiver circuits, can solve the problems of increasing the cost of the microcontroller integrated circuit, consuming a substantial amount of power when it is functioning, and a relatively expensive circuit in the infrared receiver circuit, and achieves the effects of slow response time, high sensitivity, and slow discharging
US20120306577A1Active Publication Date: 2012-12-06IXYS INTL LTD
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
IXYS INTL LTD
Publication Date
2012-12-06

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Abstract

A microcontroller integrated circuit includes an open-loop transimpedance amplifier (OLTA). An input lead of the OLTA is a terminal of the microcontroller. The cathode of a photodiode is connected to VDD and the anode is connected to the terminal. The OLTA maintains the photodiode in a strongly reverse-biased condition, thereby keeping diode capacitance low and facilitating rapid circuit response. The input of the OLTA involves a diode-connected field effect transistor that provides a low impedance. This low impedance decreases as the diode current increases, thus providing effective clamping of the voltage on the terminal. By this clamping, the amount of photodiode capacitance discharging necessary when transitioning from a high input current condition to a low input current condition is reduced, thereby further improving amplifier response time. The OLTA is small and consumes less than thirty microamperes and functions to mirror photodiode current and compare to a predetermined level.
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Description

CROSS REFERENCE TO RELATED APPLICATION

[0001] This application is a continuation of, and claims priority under 35 U.S.C. §120 from, nonprovisional U.S. patent application Ser. No. 11 / 479,037 entitled “Open-Loop Transimpedance Amplifier for Infrared Diodes,” filed on Jun. 30, 2006, now U.S. Pat. No. ______ the subject matter of which is incorporated herein by reference.TECHNICAL FIELD

[0002] The described embodiments relate to infrared receiver circuits, and more particularly to an infrared receiver circuit that is fully integrated onto a microcontroller integrated circuit within a learning remote control device.BACKGROUND INFORMATION

[0003] Manufacturers of electronic consumer devices (for example, televisions, radio tuners, home theatre and entertainment systems, digital video disc (DVD) players, video cassette recorders (VCR), compact disc (CD) players, set-top cable television boxes, set-top satellite boxes, video game controllers, home appliances, etc.) typically supply an infrared re...

Claims

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