By Fei Yuan
ISBN-10: 1441976795
ISBN-13: 9781441976796
CMOS Circuits for Passive instant Microsystems via Fei Yuan This publication offers a accomplished remedy of the layout rules and implementation of CMOS circuits and platforms for passive instant microsystems. significant topics lined within the booklet contain: passive instant microsystems, radio-frequency strength harvest, info encoding, modulators and demodulators, low-power precision voltage references, clock new release and calibration, and low-power analog-to-digital converters. This book’s contents function an exhaustive survey of lately released paintings during this quick evolving box, and are offered with an emphasis on either the layout rules and in-depth comparability of the professionals and cons of the designs. This booklet presents the cutting-edge of CMOS circuits for passive instant microsystems. it really is a useful source for graduate scholars, IC layout engineers and researchers operating during this fast-evolving box. •Systematically offers CMOS circuit implementation of passive instant microsystems, offering either theoretical history and sensible implementation examples; •Provides in-depth comparability of the professionals and cons of other topologies of CMOS circuits for passive instant microsystems; •Focuses on highly-applied subject matters, reminiscent of radio-frequency energy harvesting, voltage multipliers, ultra-low energy present and voltage references for passive instant microsystems, low-power ASK demodulators for passive instant microsystems, distant clock calibration of passive instant microsystems, and low-power analog-to-digital converters.
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Example text
Radio-Frequency Power Harvest 30 Parasitic shunt capacitances of the spiral inductor Cp′ increases the effect of Cp′ C conductive loss by a factor of 1 + essential. To minimize its effect, Cp′ ≪C is The power efficiency of the impedance transformation network can be further analyzed by neglecting the shunt capacitances Cp and CL for simplicity. 62) and the current flowing from the antenna to the impedance transformation network at the maximum power transfer is given by Iin = Va . 63) The power delivered to the voltage multiplier is obtained from PL = RL IL2 .
San et al. 7 [23]. ,5a and one capacitor Ca are added. When φ = 1, M1a,3a,5a are ON while M2a,4a are OFF. As a result, VB,C = 0, VA = Vm , and Ca is charged to Vm . In the following phase where φ = 0, M1a,3a,5a are OFF and M2a,4a are ON. The voltage of the capacitor Ca is applied between the gate and drain of M2 . For MOSFETs in the triode, VDS ≤VGS − VT must be satisfied. 13) where Vb is the voltage applied between the gate and the drain of the MOSFET. It follows that Vb − VT > 0. It becomes evident that if Vb > VT , M2 will be in the triode region and VDS2 will be small.
The main drawback is that native MOS structure is not generally supported. Also, the large channel resistance of native MOSFETs deteriorates the performance. 11 [26]. It is ready to verify that once a load is connected between nodes 1 and 2, the current flowing through the load is always in the same direction. A key advantage of this voltage multiplier is the low voltage drop across switching MOSFETs. As a result, a large voltage exists at the output of the rectifying cell and is given by Vout,max = Vm − (VDS,n + VSD,p ).