Method and apparatus for measuring a low power signal

Details Method and apparatus for measuring a low power signal Method and apparatus for measuring a low power signal

2007-03-27

2007-03-27

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140AG, C356S215000

Reissue Patent

active

10956015

ABSTRACT:
Low intensity light is incident upon a photodiode whose output is coupled to an integrator. The output of the integrator is coupled to an input of an A/D converter, whose output is coupled to a microprocessor, whose output is coupled to a filter. A second output of the microprocessor is coupled to a gate electrode of a FET to provide a reset signal to the FET to reset the integrator. The microprocessor compares the digital samples of the integrated signal from the A/D converter and, firstly, generates the reset signal if a sample is beyond a set limit, and, secondly, calculates delta values between adjacent samples and interpolates the delta values for the reset periods so as to provide a continuous data stream which can be filtered by a filter matched to the form of the original signal.

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Clevorn, J., Examiner. European Search Report,Application No. EP 01 11 8467, dated Jan. 9, 2002.

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