Download e-book for iPad: Adaptive Analog VLSI Neural Systems by M. Jabri, R.J. Coggins, B.G. Flower

By M. Jabri, R.J. Coggins, B.G. Flower

ISBN-10: 0412616300

ISBN-13: 9780412616303

ISBN-10: 9401105251

ISBN-13: 9789401105255

amplitude ~---. -----. -----. -----,-----. -----,-,~ VfT:j·" four. 50 four. 00 three. 50 q . three. 00 /'\. ~ -'" : ! . 2. 50 ,: \ . . . 1! -. i "'" " 2. 00 1. 50 ··GO··O_O_ ,-. . . . &. , . ; D Q . " . . . / 1. 00 zero. 50 zero. 00 L. -----1. . ---. . l. -----:-:::''"::-::--::-::-'-:::-::------=--::-'-::-:=---=-=""=_:' five. 00 10. 00 15. 00 determine 7. 1 The morphology of ST and VT retrograde 1:1. © 1995 IEEE [Coggins, labri, Flower and Pickard {1995}]. ing to the analog area. also, using differential pair multipliers and present node summing within the community permits a min­ imum of units within the community itself and consequently linked discount rates in strength and quarter. in spite of the fact that, within the previous couple of many years analog sign processing has been used sparingly as a result of the results of machine off­ units, noise and drift*. The neural community structure alleviates those difficulties to a wide volume for the reason that it's either hugely parallel and adaptive. the truth that the community is knowledgeable to acknowledge morphologies with the analog circuits in-loop signifies that the synaptic weights might be tailored to cancel gadget offsets [Castro, Tam and Holler (1993); Castro and candy (1993)]. The impression of neighborhood un correlated noise is decreased via the parallelism of * so much fabrication methods were optimised for electronic layout concepts which ends up in terrible analog performance.

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One is to trim critical components during production - which adds to cost - while the others involve some form of calibration or the use of more clock cycles to carry out a conversion and effectively trade speed for resolution. Regardless of which method is used, the achievement of high speed and high resolution together is difficult and remains an active frontier in research. Bipolar technology is generally preferred for converters at more than 10M samples/ sec, though CMOS performance continues to improve.

Ss is up, and the five numbered switches are to the right, connecting all bottom plates to VI. Under these conditions, the total charged stored on the capacitor set is seen to be - 2CV1 • In step 2 of the cycle, SG switches up, isolating the top plates, the numbered switches move to the left, grounding the bottom plates and Ss moves to the reference voltage position. At this point, no charge transfer has taken place, the total charge stored is as before, but the comparator input voltage has fallen to - VI.

In the single cycle schemes an error associated with one bit produces a fixed error if that bit is set. So a 1% error in the MSB value, say, simply limits the overall accuracy of the system to 1%. But, in this cyclic scheme, a 1% error in the Va value after the first cycle becomes a 2% error after the next and so on. So the simplicity of this scheme is offset by the need for very accurate design and technology in realising it. For example, apart from capacitor mismatch, this circuit is also subject to errors due to the finite gain of the integrator op amp.

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Adaptive Analog VLSI Neural Systems by M. Jabri, R.J. Coggins, B.G. Flower


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