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 as a result linked rate reductions in strength and sector. despite the fact that, within the previous few many years analog sign processing has been used sparingly end result of the results of gadget off­ units, noise and drift*. The neural community structure alleviates those difficulties to a wide quantity considering the fact 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 should be tailored to cancel machine offsets [Castro, Tam and Holler (1993); Castro and candy (1993)]. The influence of neighborhood un correlated noise is diminished via the parallelism of * so much fabrication tactics were optimised for electronic layout ideas which leads to terrible analog performance.

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But in analog design, where the output conductance is critical in determining gain, a further modification is made. As stated above, the depletion layer width in the saturated channel is slightly dependent on Vd. As Vd rises, the depletion layer widens and the effective length of the 'formed' part of the channel is reduced. Since conduction in this part of the channel is inversely proportional to effective length, the result is a rise in Ids, when other parameters are held constant. The exact analysis of this effect is complex, so that it is approximated by a linear term, which is determined empirically.

Here the precision of voltage that may be stored increases with the size of the capacitance due to the improved signal to noise ratio of the storage device. Precision can also be traded for area at the circuit level. For example, a multiplying DAC circuit can be realized by generating binary weighted currents from an array of weighted current sources or by generating binary weighted voltages or charges using weighted arrays of resistors or capacitors respectively. In each case the size of the device arrays determines the precision (number of bits) that can be realized.

Directly associated with the trade-off of circuit resources is the trade-off which exists between different VLSI circuit devices. In addition to these low level circuit trade-offs a number of system level implementation issues affect the basic building block implementations. These include system testability, system I/O requirements and system wide manufacturing yield. 1 Functional designs to architectures In this section we describe the choices available in the trade-off of circuit performance versus circuit resources and system level requirements.

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


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