By Fei Yuan
CMOS Circuits for Passive instant Microsystems by means of Fei Yuan This booklet offers a finished therapy of the layout ideas and implementation of CMOS circuits and platforms for passive instant microsystems. significant matters lined within the publication contain: passive instant microsystems, radio-frequency strength harvest, facts encoding, modulators and demodulators, low-power precision voltage references, clock iteration and calibration, and low-power analog-to-digital converters. This book’s contents function an exhaustive survey of lately released paintings during this quickly evolving box, and are provided with an emphasis on either the layout rules and in-depth comparability of the professionals and cons of the designs. This e-book offers the state of the art of CMOS circuits for passive instant microsystems. it's a useful source for graduate scholars, IC layout engineers and researchers operating during this fast-evolving box. •Systematically provides CMOS circuit implementation of passive instant microsystems, offering either theoretical historical past and sensible implementation examples; •Provides in-depth comparability of the professionals and cons of alternative topologies of CMOS circuits for passive instant microsystems; •Focuses on highly-applied subject matters, similar to radio-frequency strength 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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Additional resources for CMOS Circuits for Passive Wireless Microsystems
E. RL ≪ωLp and RL ≪Rp , we have ηI ≈ RL . 68) The power efficiency of the LC impedance transformation network in this case is directly proportional to RL . 56) that ηI ≈ 1− = Rs Ra 1+ Cp′ C Rs R L Ra − Ra RL RL − RL Rp 1+ Cp′ C − Ra . 69) is simplified to ηI ≈ RL . e. RL ≫ωLp , we have ηI ≈ (ωLp )2 . 71) The power efficiency in this case is inversely proportional to RL . 6 nH and Ra = 50Ω. As can be seen that ηI rises with RL approximately linearly when RL is small and decreases with RL when RL is large.
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 . 65) where Rp′ = Rp ||Rs′ and QL = RL . 66) Note that since RL is typically smaller than Rp and Rs′ , RL ≈Req holds.
By employing a step-up transformer, the same power can be delivered from the primary winding to the secondary winding with a higher voltage at the secondary winding. Since the voltage of the secondary winding of the transformer will be larger than that of its primary winding while the current of the secondary winding will be smaller than that of its primary winding. The loss of the primary winding is dominated by its ohmic loss due to its large current while the loss of the 46 Radio-Frequency Power Harvest secondary winding is dominated by its spiral-substrate loss due to its large number of turns.
CMOS Circuits for Passive Wireless Microsystems by Fei Yuan