By John Hu
This ebook will introduce a number of strength administration built-in circuits (IC) layout thoughts to construct destiny energy-efficient “green” electronics. The aim is to accomplish excessive potency, that is necessary to meet shoppers’ turning out to be want 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, as a way to decrease the actual dimension and the producing rate of the units.
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Extra resources for CMOS High Efficiency On-chip Power Management (Analog Circuits and Signal Processing)
The only difference here is that A is a non-linear circuit. As a result, the conclusion so far in this section and from Sect. 1 still applies: that an optimum switching DC-DC regular should also approximate an ideal voltage source with minimal RS and input voltage dependence, and that output shunt feedback is preferred over series. 3 Topologies: LDO vs HDO Even when implementing the most common feedback mechanism, a series-shunt linear regulator, the choice of the output stage configuration makes a significant difference in performance and power efficiency.
9 Quantitative line regulation analysis ΔVIN VBG ΔV1 AEA ΔVout VFB β ΔVout APT β R1 R2 As VDO is reduced, MOSFET will eventually enter the triode region because the previous gain stage that is driving the pass element can only provide a limited VSG,max . As VDO is further reduced, the pass element will reach the boundary of saturation and linear region (depicted as P2 in Fig. 8). Quantitatively, the amount of DC line regulation can be defined and calculated using Fig. 9. 8) Let AEA , APT be the DC gain of the error amplifier and the PMOS pass element respectively.
3. Silicon IPs. To support the architectural power management schemes, at least two types of silicon IPs are needed. One type is the various forms of integrated power converters that can execute the DVFS scheme by generating, distributing, and delivering the variable supply voltages to different circuits and power domains, such as multiple- and variable-output DC-DC converters (Ma and Bondade 2010; Huang and Chen 2009; Le et al. 2007; Ma et al. 2003). Due to the dynamic nature of DVFS, fast reference tracking DC-DC converters are also essential (Ma et al.