发明申请
US20120153909A1 HYBRID FAST-SLOW PASSGATE CONTROL METHODS FOR VOLTAGE REGULATORS EMPLOYING HIGH SPEED COMPARATORS 审中-公开
采用高速比较器的电压调节器的混合快速低通控制方法

HYBRID FAST-SLOW PASSGATE CONTROL METHODS FOR VOLTAGE REGULATORS EMPLOYING HIGH SPEED COMPARATORS
摘要:
Voltage regulator circuits and methods implementing hybrid fast-slow passgate control circuitry are provided to minimize the ripple amplitude of a regulated voltage output. In one aspect, a voltage regulator circuit includes a comparator, a first passgate device, a second passgate device, and a bandwidth limiting control circuit. The comparator compares a reference voltage to a regulated voltage at an output node of the voltage regulator circuit and generates a first control signal on a first gate control path based on a result of the comparing. The first and second passgate devices are connected to the output node of the regulator circuit. The first passgate device is controlled in a bang-bang mode of operation by the first control signal to supply current to the output node. The bandwidth limiting control circuit has an input connected to the first gate control path and an output connected to the second passgate device. The bandwidth limiting control circuit generates a second control signal based on the first control signal, wherein the second control signal is a slew rate limited version of the first control signal, and wherein the second passgate is controlled by the second control signal to supply current to the output node.
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