Noise canceling photodetector preamplifier useful for...

Details Noise canceling photodetector preamplifier useful for... Noise canceling photodetector preamplifier useful for...

H - Electricity

03

F

H03F 3/16 (2006.01) H03F 1/30 (2006.01) H03F 3/08 (2006.01) H03F 3/45 (2006.01)

Patent

CA 2042277

NOISE CANCELING PHOTODETECTOR PREAMPLIFIER USEFUL FOR COMPUTERIZED TOMOGRAPHY ABSTRACT OF THE DISCLOSURE A preamplifier interfaces low level current-mode signals, such as from a photodetector in a computerized tomography system, to corresponding voltage-mode signals, with a dynamic range on the order of 120 dB. The preamplifier can be implemented in CMOS technology to allow for complete integration of the computerized tomography interface function, including analog-to-digital conversion, of several channels in a single integrated circuit. The CMOS circuit accepts a current signal at its input and, after integration of the signal, produces a voltage output wherein the low frequency noise that is normally encountered with MOS transistors is cancelled through the use of correlated-double sampling. The circuit limits high frequency noise through use of low-pass filtering.

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