CMOS High Efficiency On-chip Power Management (Analog by John Hu

By John Hu

This e-book will introduce numerous strength administration built-in circuits (IC) layout recommendations to construct destiny energy-efficient “green” electronics. The objective is to accomplish excessive potency, that is necessary to meet shoppers’ becoming 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, that allows you to lessen the actual dimension and the producing fee of the units.

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1) 1 + AB The same conclusion can also be drawn by inspecting the essence of regulation. The output voltage, not current, is the parameter that needs to be stabilized against variations. Thus, only the output shunt feedbacks (series- or shunt-shunt) are preferred. 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.

This book adopts the first approach, where the parasitic phase shift around a negative feedback loop is analyzed. When the parasitic phase shift reaches 180◦, the loop gain should be less than unity (0 dB); and when the loop gain drops to unity, the parasitic phase shift should be less than 180◦ with an appropriate amount of phase margin (Razavi 2001). There are at least two poles in the LDO feedback loop. One is associated with the node of the error amplifier output (usually also the gate of the pass element) 1 1 pEA = Rout,EA C par .

Any sinusoid signal that gets amplified and oscillates will void the purpose of the converter. As a result, a key AC parameter for an LDO is the ensemble of different stability measures. 2 LDO Performance and Design Challenges 51 Meanwhile, when sensitive analog and radio-frequency (RF) integrated circuits are used as loads of the LDO, any output ripples or noise could be detrimental to proper operation and corrupt the already vulnerable signals. Thus, AC parameters include power supply rejection as well.

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