By John Hu
This publication 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 strength administration IC layout suggestions to construct destiny energy-efficient “green” electronics. The aim is to accomplish excessive potency, that's necessary to meet shoppers’ starting to be desire for longer battery lives. the focal point is to review topologies amiable for complete on-chip implementation (few exterior elements) within the mainstream CMOS expertise, so as to decrease the actual measurement and the producing price of the devices.
- Describes a couple of concepts at circuits and platforms point that elevate sleep-mode potency to extend the battery lifestyles, with no 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 thoughts for energy administration IC designs paintings towards society’s quest for larger power efficiency.
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Additional info for CMOS High Efficiency On-chip Power Management
Series-series and shunt-series feedback stabilize the output current, and therefore they are more suitable for building current sources. Among the two shunt feedback configurations, series-shunt is more commonly used. 3 shows a possible block level implementation of this configuration. An operational amplifier (opamp) and an MOSFET transistor constitute the basic amplifier A. A resistor ladder R1 , R2 acts as the feedback network by sensing the output voltage Vout and feeding a portion of it back to the input (still in the form of voltage).
Power domain division divides a complex SoC cores into different power domains, each enjoying its own supply voltages and leakage current control (often through power gating). For example, mobile baseband processor OMAP 3,430 (OMA 2008) is divided into four to five power domains: MCU core, DSP core, graphic accelerator, Peripherals, and always-on circuits, each of which could be configured independently. 1 Overview: A Holistic Approach 21 Another architectural power management scheme is dynamic voltage and frequency scaling (DVFS) (Ma and Bondade 2010).
Some of the limiting factors for its usage include the extra effort involved in designing current-mode analog circuits. 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.