Low-dropout regulator with band-reject power supply rejection ratio for phase locked loop voltage controlled oscillator

A technology of power supply rejection ratio and power supply voltage, applied in the direction of automatic power control, control/regulation systems, instruments, etc., can solve problems such as limiting noise performance

Inactive Publication Date: 2019-04-02
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] As the noise performance of the PLL improves, the impact of power supply noise becomes more pronounced and may even limit the noise performance in some cases

Method used

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  • Low-dropout regulator with band-reject power supply rejection ratio for phase locked loop voltage controlled oscillator
  • Low-dropout regulator with band-reject power supply rejection ratio for phase locked loop voltage controlled oscillator
  • Low-dropout regulator with band-reject power supply rejection ratio for phase locked loop voltage controlled oscillator

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Embodiment Construction

[0022] While many aspects have been described herein, these aspects have been presented by way of example only, and not intended to limit the scope. The apparatus and methods described herein may be implemented in various other forms. Furthermore, various omissions, substitutions and changes in the form of the exemplary apparatus and methods described herein may be made without departing from the scope of protection.

[0023] The term "coupled" used throughout the specification means "connected directly or indirectly through electrical, mechanical, etc. intermediate connections (eg, switches)" and is not necessarily limited to physical connections. Additionally, attachment may be such that objects are permanently attached or releasably attached. Connections can be made via switches.

[0024] Phase-locked loop (PLL) circuits are often important components of devices designed to operate in wireless communication systems. When the PLL is in the locked configuration, the PLL fo...

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Abstract

A voltage regulator includes a band limited reference voltage. The band limited reference voltage is generated from a supply voltage combined with a feedback path to provide a band reject power supplyrejection ratio (PSRR). The voltage regulator also includes a feedforward path to extend the band reject PSRR.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of U.S. Provisional Patent Application No. 62 / 363,098, filed July 15, 2016, entitled "LOW-DROPOUT REGULATOR WITH BAND-REJECT POWER SUPPLY REJECTION RATIO FOR PHASE LOCKED LOOP VOLTAGE CONTROLLEDOSCILLATOR," the disclosure of which expressly incorporated herein by reference in its entirety. technical field [0003] The present disclosure relates generally to wireless communication systems, and more particularly to methods and apparatus for reducing noise within a phase locked loop (PLL). Background technique [0004] Phase-locked loops (PLLs) are commonly used in telecommunications, computers, and other electronic equipment that utilize precise clocks to coordinate and synchronize activities. A PLL can provide the local oscillator (LO) function in a radio receiver or transmitter. PLLs are also used for clock signal distribution and noise reduction, and as a clock source for high sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L1/00G05F1/575H03L7/099
CPCG05F1/575H03L1/00H03L7/099G05F1/468H04W84/042H04W84/12
Inventor 宋同裕J·M·辛里奇斯
Owner QUALCOMM INC
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