By Fei Yuan
Many new topologies and circuit layout suggestions have emerged lately to enhance the functionality of energetic inductors, yet a accomplished remedy of the speculation, topology, features, and layout constraint of CMOS lively inductors and transformers, and an in depth exam in their rising purposes in high-speed analog sign processing and information communications over cord and instant channels, isn't really to be had. This ebook is an try and supply an in-depth exam and a scientific presentation of the operation ideas and implementation information of CMOS energetic inductors and transformers, and an in depth exam in their rising functions in high-speed analog sign processing and knowledge communications over cord and instant channels.
The content material of the ebook is drawn from lately released learn papers and aren't to be had in one, cohesive e-book. equivalent emphasis is given to the idea of CMOS lively inductors and transformers, and their rising functions. significant topics to be lined within the e-book comprise: inductive features in high-speed analog sign processing and knowledge communications, spiral inductors and transformers вЂ“ modeling and boundaries, a old point of view of machine synthesis, the topology, characterization, and implementation of CMOS energetic inductors and transformers, and the applying of CMOS energetic inductors and transformers in high-speed analog and electronic sign processing and knowledge communications.
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Extra info for CMOS Active Inductors and Transformers: Principle, Implementation, and Applications
Transconductance of MOSFETs in the saturation and triode regions. Because ΔiDS1 > ΔiDS2 , gm > gds follows. 6 Stability Gyrator-C active inductors are negative feedback systems. The stability of active inductors is critical to the overall stability of systems employing active inductors. In this section, we investigate the stability of gyrator-C active inductors. 58) Go to simply the results. The poles of the system C1 + C2 4C1 C2 Gm1 Gm2 − 1± 1 − .
This is because an increase in vin will lead to an increase in vGS , which in turn increases iD . Because io = iD − J, io will increase as well. 16(b) is also positive. This is because an increase in vin will decrease iD1 . As a result, iD2 = J1 − iD1 will increase. Since io = iD2 − J2 , io will increase as well. 14. The effect of Rs on the quality factor of active inductors. Rs is varied from 1Ω to 10Ω with step 1Ω. 16(b) is given by ro2 . 16(b) will have a smaller Rs , subsequently a higher Q.
50) . 51) must be the same. To achieve this, we impose Vn = Vn1 , In = Y2 Vn1 + Gm2 Vn2 . 53) we arrive at Vn = Vn1 + Zin In . 52) becomes Vn = Vn1 , In = (Go2 + sC2 )Vn1 + Gm2 Vn2 . 57) 2 Vn1 G m1V+ vn 1 v n1 v n2 Y2 + 2 . 25. 5 Gm2V- (b) Noise of single-ended gyrator-C active inductors. Linearity The preceding development of gyrator-C active inductors assumes that the transconductors of the active inductors are linear. This assumption is only valid if the swing of the input voltage of the transconductors is small.