High-Speed Photodiodes in Standard CMOS Technology by Sasa Radovanovic, Anne-Johan Annema, Bram Nauta

By Sasa Radovanovic, Anne-Johan Annema, Bram Nauta

High-speed Photodiodes in normal CMOS Technology describes high-speed photodiodes in common CMOS know-how which enable monolithic integration of optical receivers for short-haul conversation. for brief haul communique the fee element is necessary , and accordingly it really is fascinating that the optical receiver should be built-in within the comparable CMOS expertise because the remainder of the procedure. If this is often attainable then finally a singe-chip procedure together with optical inputs turns into possible, putting off EMC and crosstalk difficulties, whereas facts fee might be tremendous high.

The challenge of photodiodes in ordinary CMOS expertise it that they have got very constrained bandwidth, permitting information premiums as much as in basic terms 50Mbit in line with moment. High-speed Photodiodes in common CMOS Technology first analyzes the photodiode behaviour and compares present options to reinforce the rate. After this, the booklet introduces a brand new and strong digital equalizer strategy that makes information charges of 3Gb/s attainable, with out altering the producing expertise. the applying of this system are available in brief haul fibre communique, optical published circuit forums, but in addition photodiodes for laser disks.

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18 µm twin-well CMOS technology. 185 . The overall photodiode area is 50 × 50 µm2 . The nwells are connected with metal-2 and pwells with metal-1. The total metal area is about 13% of the total photodiode area meaning that the input light signal is decreased for 13%. 18: a) Layout of nwell/p-substrate photodiode with 2 µm nwell-width in standard CMOS technology b) chip-micrograph. 18 is measured first 5 The technology has five metal layers and one polyscilicon layer available. CHAPTER 3. CMOS PHOTODIODES FOR λ = 850 NM 62 with the DC optical signal.

The masked fingers connected together form the deferred (D) detector. The other fingers connected together form the immediate (I) detector. The slow tail in the time-response of both detectors is very similar, since approximately the same number of the substrate carriers diffuse towards the two detectors. The fast overall photodiode response is achieved by subtraction of the two diode responses. This however results in lower responsivity (about 75% of the input signal is lost) and hence lower sensitivity.

Optics, vol. 27, pp. 1742-1751, 1998. [10] E. A. de Souza, M. C. Nuss, W. H. Knox and D. A. Miller: ”WavelengthDivision Multiplexing with femtosecond pulses”, Optics Letters, vol. 20, pp. 1166-1168, 1996. [11] J. Hecht: “Understanding Fiber Optics”, Prentice Hall, New Jersey, 1999. [12] A. Bakker: “An Adaptive Cable Equalizer for Serial Digital Video Rates to 400 Mb/s”, Dig. Papers ISSCC 1996, pp. 174-175. [13] W. , July 2003. [14] W. J. Liu, O. -C. -K. Dai and Far-Wen Jih Chung Cheng: “A CMOS Photodiode Model”, 2001 IEEE International Workshop on Behavioral Modeling and Simulation, Santa Rosa, California, October 10-12, 2001.

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