CMOS High Efficiency On-chip Power Management by John Hu

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By John Hu

This booklet bargains with the subject material of strength administration built-in circuit (IC) layout, or built-in strength electronics, as a reaction to the growing to be want for energy-efficient electronics. The authors introduce numerous energy administration IC layout options to construct destiny energy-efficient “green” electronics. The objective is to accomplish excessive potency, that's necessary to meet shoppers’ becoming want for longer battery lives. the focal point is to check topologies amiable for complete on-chip implementation (few exterior elements) within the mainstream CMOS expertise, for you to lessen the actual measurement and the producing price of the devices.

  • Describes a few ideas at circuits and platforms point that bring up sleep-mode potency to delay the battery existence, with out sacrificing functionality parameters;
  • Enables readers to layout for compactness, which calls for fewer cumbersome exterior parts and circuit topologies that lend themselves simply to complete on-chip integration;
  • Offers insights on how the potency boosting recommendations for strength administration IC designs paintings towards society’s quest for greater strength efficiency.

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13. Strictly speaking, this method introduces both a zero and a pole. But the zero is located before the pole such that a net phase boost can be reaped from the configuration. 2 LDO Performance and Design Challenges 53 Vin VBG Vin AEA APT VBG APT AEA Vout Vout VFB VFB R1 R1 C1 R2 R2 Design of Ricon−Mora98JSSC Commonly used high freq bypass (phase lead) Vin VBG APT AEA Vout VFB R1 R2 C1 on−chip zero generation Design of Chava03TCAS−I and Lin08TCAS−II Fig. 14 Frequency compensation methods of a PMOS LDO Since the zero comes before the pole but they are closely located, the phase boost from the structure is limited.

Voltage mode circuit IP, such as various opamps, are readily available. In addition, highly accurate current references are needed. If the current reference is to be derived from a voltage reference, than a buffer circuit is usually needed, as the commonly used bandgap reference does not have sufficient driving capabilities. Though the analysis of feedback control so far has been in the context of linear systems, the same principles apply to non-linear systems as well. 4 shows 40 3 Linear Regulators A Vi Vsw Vo Vsw Vo B output waveforms of a switching converter series−shunt configuration with a nonlinear A Fig.

25). Furthermore, cheaper and smaller multilayer ceramic capacitors can be used instead of the bulky tantalum capacitors, since their ESR no longer need to act as the main compensation factor. In state-of-the-art LDO design, another major challenge in stability is that LDO needs to be source a wide range of output current. As a result, pout changes 54 3 Linear Regulators substantially, as the pass element rds = λ1ID varies with ID (Iout ), making the compensation more difficult. Since a fixed zero no longer meets the demand, the concept of zero-pole tracking has been introduced (Kwok and Mok 2002; Shi et al.

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