New PDF release: Adaptive Analog VLSI Neural Systems

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 accordingly linked mark downs in energy and sector. notwithstanding, within the previous couple of a long time analog sign processing has been used sparingly as a result of results of equipment off­ units, noise and drift*. The neural community structure alleviates those difficulties to a wide volume considering it truly is 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 gadget offsets [Castro, Tam and Holler (1993); Castro and candy (1993)]. The impression of neighborhood un correlated noise is lowered via the parallelism of * so much fabrication strategies were optimised for electronic layout ideas which leads to terrible analog performance.

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The input-output transfer curve has three regions. At the left, when the input is low, Ml is off and M2, being a pMOS transistor with a negative Vg , is on. With no external load, the output is connected to Vdd by a conducting path, through which no current flows. The output voltage is therefore exactly at Vdd. 7 (a) Cross-section and (b) schematic of a CMOS pair connected as an inverter. (c) Static DC transfer characterisitic of a CMOS inverter. (d) Typical supply current as a function of input voltage.

CHAPTER 4 Analog VLSI building blocks In this chapter the issues affecting the implementation of the lowest level circuit elements of an analog VLSI neural network are discussed. That is, once a functional specification has been decided upon there are still many design choices available. For most applications these are represented by the trade-off between the resources of circuit area and power consumption against the performance factors of speed, precision and reliability. Directly associated with the trade-off of circuit resources is the trade-off which exists between different VLSI circuit devices.

SI (the MSB) moves to the right, changing the comparator input to - VI + VR/2. If this voltage is negative, the bit and the switch remain set. If it is positive, the switch returns. 26 Schematic of a one-step '/lash' ADC. then left set or cleared, depending on the sign of the comparator input. The process then continues until the LSB is tested, each test applying a voltage change which is one half of the previous one. This chapter concludes with a brief mention of the fastest ADC, the flash converter.

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


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