By P.V. Ananda Mohan
Current-mode layout is of serious curiosity to high-tech analog designers this present day, who're mostly fascinated about designing entire platforms on a chip. This paintings makes a speciality of the speculation and strategies of many vital current-mode circuit layout thoughts making it a entire technical evaluation that fills a niche within the present literature.
The goal of the booklet is to assemble all on hand details within the region of OTA-C filters, present conveyor and CFOA dependent filters, switched-current filters, and log-domain filters into one entire reference quantity. sensible purposes of current-mode layout thoughts for figuring out functional VLSI platforms comparable to disk force learn channel ICs and video filters are lined intimately. The heritage required for this booklet is an publicity to a primary direction in lively RC filters, electronic sign processing and optionally, a few wisdom of switched capacitor filters.
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Additional info for Current-Mode VLSI Analog Filters: Design and Applications
Example text
For obtaining a notch filter with (Up > (uz, or (Up < (uz, gm8 is not required, whereas gm8 is required for an allpass transfer function. 5 (b», the summed current can be directly fed at node A of the next stage. However, in the last stage, if a notch or all-pass filter is desired, the additional OT A gmlO can be employed. 5 (b) and (d) are quite low. It is relevant to consider the scaling policy that needs to be employed to optimize the dynamic range. This optimization will ensure that the various node voltages at internal nodes saturate at the same output level.
9 (a) provides low-pass, band-pass, high-pass and band-stop transfer functions while needing only four dual output OTAs. 9 (c) does not provide variable bandwidth option and can provide only a low-pass or band-pass transfer function. 10 (a) provide high-pass output as well. 9 (a), the various transfer functions are presented next for illustrative purposes. 9. 16d) DI (S)·([03 + los) = -(kll T2· S + kIZ)·/il - k12· TI·S. 2. 11. 10. 11. Resistor simulation using OT As 34 Operational Transconductance Amplifier-C Filters than those in circuits obtained using other techniques.
Depending on the design of the OT A, the actual gm can be modeled by a single-pole, single-zero model. The effect of nonidealities on a typical OT A-C biquad are considered in this section. Techniques for frequency compensation of the frequency dependence of gm have been described in the literature. 23. 19a) where a single-pole model is assumed. Under the condition gmldwpl the above equation reduces to . O ! 1+s. I ~ II {I- + -11 +s . ) C4 50 . 22 . 22. 23. 35J in actively compensated OAs that such a transfer function has phase errors which are third-order functions of ((()/(()pi).