National Semiconductor Corporation

Robert Eric Fesler

Chunping Song

Aaron Grant Simmons

A circuit for providing an improved 'feed forward' zero in a feedback loop such that the zero has a frequency dependent on the transconductance (gm) of a common gate transistor, and pole and zero separation that is dependent on a multiple of the gm. The circuit includes an error amplifier and a compensation circuit. The compensation circuit provides a first feedback current and a second feedback current. The error amplifier receives a reference signal and a feedback signal. The feedback signal is provided by summing the first feedback current and the second feedback current.

Zero generator for voltage regulators

A system for verifying data in a shadow memory is provided that includes a main memory, a shadow memory, a shadow memory initializer, and a shadow memory verifier. The main memory is operable to store main data persistently. The shadow memory is operable to store shadow data temporarily. The shadow data comprises a copy of the main data. The shadow memory initializer is operable to detect an initialization event and to initialize the shadow memory based on the initialization event. The shadow memory verifier is operable to detect a verification event and to verify the shadow data based on the verification event.

Method and system for verifying data in a shadow memory

Voltage regulators use capacitors to compensate the voltage regulator and provide stable performance. Capacitors have an inherent equivalent series resistance (ESR) that changes over various operating conditions including signal frequency, operating temperature as well as others. An apparatus and method compensates for the low ESR of capacitors to increase the total equivalent series resistance of the capacitor. By providing an &ldquo;on-chip&rdquo; resistance between the capacitor and the circuit ground potential, minimum total ESR can be provided such that stable load regulation is achieved with capacitors that would otherwise be undesirable for such use. Increasing the value of the output capacitor's equivalent series resistance allows wider ranging values of capacitance to be used. The increased range of capacitance values allows capacitors of different material types to be used. Additionally, other arrangements with multiple resistors that are arranged as series resistors between the compensation capacitor and one or more of the power supplies provide stable load regulation.

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Saratoga, CA, United States of America

Robert Eric Fesler