Voltage regulator having an inverse adaptive controller

• US 7,030,595 B2
• Filed: 08/04/2004
• Issued: 04/18/2006
• Est. Priority Date: 08/04/2004
• Status: Expired due to Fees

• Current Assignee: Nanopower Solutions Incorporated
• Original Assignee: Nanopower Solutions Incorporated
• Inventors: Akita, Shinichi
• Primary Examiner(s): Riley, Shawn
• Application Number:
  US10/910,956
• Publication Number:
  US 20060028189A1
• Time in Patent Office: 622 Days
• Field of Search: 323/280, 323/281, 323/315, 323/316
• US Class Current: 323/280
• CPC Class Codes: G05F 1/575 characterised by the feedback circuit

Abstract

A low drop-out (LDO) voltage regulator that has high a PSRR (Power Supply Ripple Rejection) performance and a high load regulation with low current consumption is disclosed. The voltage regulator doses not require any high gain error amplifier that may cause instability in the voltage regulator. A voltage-controlled current-feedback is presented that generates an inverse phase signal and compensation voltage for a ripple noise and dropout voltage, respectively. The voltage-controlled current-feedback generates a negative voltage slope with regard to the power supply voltage, which can cancel the ripple noise at the output terminal. The current-feedback creates a positive coefficient voltage with regard to the load current, which compensates the voltage drop caused by parasitic resistances.

Claims

1. Voltage regulator having an inverse adaptive controller comprising;

a first power supply terminal and a second power supply terminal;

a reference voltage generator to provide a reference voltage;

a output buffer generating regulated voltage controlled by an error amplifier;

a voltage divider to provide a feedback voltage; and

a voltage regulator having a voltage controlled current feedback connected to said reference voltage generator and said error amplifier;

wherein said voltage controlled current feedback decreases a feedback current inversely with regard to an increment of the said first supply voltage to decrease the reference voltage.

2. Voltage regulator having a inverse adaptive controller comprising;

a first power supply terminal and a second power supply terminal;

a reference voltage generator to provide a reference voltage;

a output buffer generating regulated voltage controlled by an error amplifier;

a voltage divider to provide a feedback voltage; and

a voltage regulator having a voltage controlled current feedback connected to said reference voltage generator and said error amplifier;

wherein said voltage controlled current feedback decreases a feedback current with regard to a decrement of the load current of said output buffer to increase the reference voltage.