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This paper discusses a technique to simplify dynamic tests of power supplies. The technique is based on the injection of an external signal into the feedback loop of a dc-dc regulator, which makes it operating as a dynamic load, if connected to the output of the power supply under test, or as a dynamic source, if connected to its input. The technique allows to easily observe load/line transient response...
This paper presents a low-dropout regulator with a transient performance enhancement circuit. The transient performance enhancement circuit improves the transient response time by sinking a remaining current in a power delivery path. Due to the limited control bandwidth, traditional LDO could not respond rapidly to the load transients. As a result, a large output voltage spike can be occurred and...
Distributed-logic-control is an independent parallel inverter control technique. The strategy to restrain circulating currents based on distributed-logical-control is researched in the paper. The conventional method by power regulation to restrain the circulating current is affected by the parallel impedance and has such disadvantages in the response speed and harmonic component of circulating current...
In the voltage regulator (VR) applications, the load transient frequency varies in a very wide range from several kHz to several MHz. When the load transient frequency approaches to the switching frequency of VR, there is a low frequency oscillation in the system, which is the beat frequency oscillation between the load transient frequency and the switching frequency of VR. And this may hurt the system...
A high-precision low-voltage low dropout regulator (LDR) using adaptive biasing to extend the loop bandwidth is proposed for system-on-chip power management applications. The multi-stage output-capacitor-free LDR is stabilized by miller compensation and Q-reduction technique to reduce the requirement of minimum load current. By using direct current feedback from a simple current mirror, the adaptively-biased...
Multiphase interleaved buck converter topology is widely used in voltage regulator (VR) applications to power the microprocessors. Voltage mode and current mode control are the two major control methods applied to VR regulation. Compared to current mode control, voltage mode control demonstrates less limitation on the loop bandwidth and less complexity in the term of design. In this paper, small signal...
Modern microprocessors can rapidly shift between a sleep state and full load operation, placing a heavy requirement on the voltage regulator to stabilize its output voltage. High repetitive rate transient poses new challenges for voltage regulator design. The old "rule of thumb" approaches for capacitor selection may not be optimized in terms of physical size, performance, and cost. In this...
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