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

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

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 for that reason linked rate reductions in strength and zone. in spite of the fact that, within the previous couple of a long time analog sign processing has been used sparingly as a result of the results of gadget off­ units, noise and drift*. The neural community structure alleviates those difficulties to a wide volume considering 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 will be tailored to cancel machine offsets [Castro, Tam and Holler (1993); Castro and candy (1993)]. The influence of neighborhood un correlated noise is decreased via the parallelism of * such a lot fabrication procedures were optimised for electronic layout innovations which leads to bad analog performance.

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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. 26 and is readily understood. The resistor string sets up a series of evenly-spaced voltages between the reference and ground. As a result of the top and bottom resistors being half the value of the others, each tap voltage lies mid-way between two levels on the scale between VR and ground.

For the pMOS input, the range is displaced downwards. The second effect is on noise. Both types of MOSFETs have a low-frequency 1/f noise component which is related to interactions between carriers and trapping centres lying close to surface of the channel. In pMOS transistors, the channel tends to lie deeper in the silicon where the trap density is lower. 14 Cascode connections: (a) the basic concept, (b) circuit model of the cascode connection, (c) an OTA with cascode output. transistors is a factor of 2 - 3 lower than nMOS transistors under the same bias conditions, so that a larger device is required to deliver the same gm.

These events occur within one system clock cycle, necessitating the formation of a two or four-phase clock. The next cycle moves the 1 in the shift register along so that it points to the next latch position and the 'testing' of this bit position proceeds. The process of generating an n-bit output word therefore takes n clock cycles plus the reset phase. 25 Charge-redistribution ADC. and the presence of non-monotonic behaviour in the DAC could give rise to errors greater than one LSB. Overall, the SA architecture - though not simple - is readily design able and represents a good compromise between the many factors influencing ADC design.

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