US 2011/0235455 A1 · VOLTAGE REGULATORS, AMPLIFIERS, MEMORY DEVICES AND METHODS

Abstract

Circuits, devices and methods are provided, such as an amplifier (e.g., a voltage regulator) that includes a feedback circuit that supplies negative feedback through a feedback path. One such feedback path includes a capacitance coupled in series with a “one-way” isolation circuit through which a feedback signal is coupled. The “one-way” isolation circuit may allow the feedback signal to be coupled from a “downstream” node, such as an output node, to an “upstream” node, such as a node at which an error signal is generated to provide negative feedback. However, the “one-way” isolation circuit may substantially prevent variations in the voltage at the upstream node from being coupled to the capacitance in the isolation circuit. As a result, the voltage at the upstream node may quickly change since charging and discharging of the capacitance responsive to voltage variations at the upstream node may be avoided.

Claims28

Dependent claims

A circuit, comprising:

an amplifying circuit configured to provide an output signal corresponding to a difference between a first signal and a second signal, the second signal being indicative of the magnitude of the output signal;
a feedback path coupled between a downstream node of the amplifying circuit and an upstream node of the amplifying circuit;
and
an isolation circuit included in the feedback path, the isolation circuit being configured to allow signal coupling from the downstream node to the upstream node while substantially preventing signal coupling from the upstream node to the downstream node.

1 more element

Dependencies are inferred from the claim text.

Voltage regulators, amplifiers, memory devices and methods

Life of this patent

Voltage regulators, amplifiers, memory devices and methods

Life of this patent

Abstract

Claims28