Miscellaneous active electrical nonlinear devices – circuits – and – External effect – Light
Patent
1997-04-25
1998-12-08
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
External effect
Light
327337, 327345, H01G 920
Patent
active
058475940
ABSTRACT:
When a photodiode receives light, it produces a charge corresponding to the intensity of light, and outputs it as a current signal. The current signal is input to an integral circuit constituted by a feedback capacitive element and a charge amplifier, and is integrated by time. On the other hand, a step charge generator generates a charge corresponding to one of reference voltage levels +Vref and -Vref in response to first and second clock signals CLK1 and CLK2, and supplies the charge to the feedback capacitive element in synchronism with the clock signal. The integral circuit executes an integral operation by accumulating the charge produced by the photodiode, and supplies a step charge, thus executing .SIGMA..DELTA. modulation. An AD conversion result is obtained from the .SIGMA..DELTA. modulation result. In this manner, high-precision digital data is output in correspondence with the intensity of light by the photodiode with a simple circuit arrangement.
REFERENCES:
patent: 3609542 (1971-09-01), Burke
patent: 4893088 (1990-01-01), Myers et al.
patent: 5142286 (1992-08-01), Ribner et al.
patent: 5198660 (1993-03-01), Yokoyama et al.
patent: 5303027 (1994-04-01), Kuderer et al.
patent: 5307145 (1994-04-01), Schenkel et al.
patent: 5367154 (1994-11-01), Pfeiffer
Graverick et al, "A 32-Channel Charge Readout IC for Programmable, Nonlinear Quantization of Multichannel Detector Data", Journal of Solid-State Circuits, vol. 30, No. 5, May 1995, pp. 533-541.
"20-Bit Analog-To-Digital Converter", Burr-Brown DDC101, 1993 Burr-Brown Corporation, pp. 1-28.
Callahan Timothy P.
Hamamatsu Photonics K.K.
Luu An T.
LandOfFree
Solid-state image sensing device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Solid-state image sensing device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solid-state image sensing device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-181865