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What is a phase-locked loop (PLL)?
A phase-locked loop or phase lock loop (PLL) is a control system which generates a signal that has a fixed relation to the phase of a "reference" signal. A PLL circuit responds to both the frequency and the phase of the input signals, automatically raisin
total search1697 articles
2002-02-01 Xicor closed loop architecture allows auto-correction
The ODIN architecture for high-performance adaptive closed-loop control allows systems designers to implement auto-correction for errors related to time, temperature or other system-level effects.
1999-09-09 Wireless local loop offers equivalence to wireline
This application note deals on how to properly address the requirements of rural subscribers demanding "equivalence to wireline" for voice services such as calling line identification and the growing demand for fast connection to the internet at speeds of 28.8kbps or 56kbps.
2008-02-27 Winbond offers four-channel codec for short-loop VoIP
Winbond Electronics Corp. America introduces what the company claims is the industry's first four-channel codec optimized for short-loop VoIP.
2004-12-02 VCO inductor and external loop filter design guidelines for the AT86RF401X
This app note explains the process of implementing a design using the AT86RF401X (RF wireless microtransmitter)
2000-06-26 Using the Virtex delay-locked loop
This application note demonstrates how to use the Virtex FPGA Series' four fully digital dedicated on-chip Delay-Locked Loop (DLL) circuits to implement several circuits that improve and simplify system-level design.
2001-08-28 Using the rate-locked-loop (RLL) mode
This application note discusses how to use the GC3011 digital filter chip in its RLL mode where the resampling ratio is automatically determined from the supplied I/O data clocks.
2002-10-12 Using the isPAC30 in a DWDM Laser Power Control Loop
This application note will focus on how the ispPAC30 can be used to implement an optical power feedback control system for a DWDM laser.
2002-06-12 Using loop filter software for the TRU-050 and loop filter program
This application note details the features of the TRU-050 module, a user-configured, PLL solution designed to simplify a wide variety of clock recovery and data retiming, frequency translation and clock smoothing applications.
2008-10-08 Using fusion for closed-loop power supply margining
A growing number of embedded systems designers want the ability to dynamically alter the precise value of a power supply's voltage.
2008-10-15 Understanding loop compensation with monolithic switchers
Monolithic switchers, such as members of the NCP101X or the NCP1027 series, associate a current-mode controller and a power MOSFET on a single-die construction.
2007-05-01 Ultralow-glitch DAC suits closed-loop control apps
TI's ultralow-glitch DAC features outstanding reference performance that makes it a flexible, easy-to-use solution for closed-loop control applications.
2003-03-10 TWC01622 Loop Filters: Compatible Components
This application note provides information of the TWC01622's loop filters' critical parameters and compatible devices that meet these parameters.
2008-02-27 TI debuts closed-loop, digital-input Class-D amp
TI claims the industry's first digital-input, 20W stereo Class-D speaker amplifier with closed loop feedback.
2001-09-12 This application note explains the loop current detection capability of Solid State Optronics' TR115 telecommunications relay.
This application note explains the loop current detection capability of Solid State Optronics' TR115 telecommunications relay.
2009-09-04 The real story about closed-, open-loop Class D amps
This article reviews the traditional method of measuring PSRR and explains why it's ineffective in measuring the effects of power supply ripple in BTL Class D amplifiers.
2000-04-19 Switching power supply control loop design
A simplified approach to feedback control loop analysis is presented in this application note. It starts with a general overview of various parameters affecting performance in a switching power system.
2008-11-12 Stability analysis in multiple loop systems
This paper capitalizes on the Ref. work and explores different ways to apply the technique to power converters featuring multiple feedback paths.
2000-12-08 SPICE model eases feedback loop designs
This application note shows the benefits of using a SPICE model when designing SMPS. It also details the way to introduce various poles/zeroes combinations when implementing a shunt regulator.
2004-05-04 Set up a PLL loop filter on the eZ80F91 MCU
This app note allows application developers to effectively use the eZ80F91 MCU's on-chip PLL feature as a system clock source.
2013-09-03 Select precision resistor for 4C20 mA current loop
The low output voltage level of the analog sensor and the long distance to the control room together contribute to considerable system design challenges. Here are clues on how to solve them.
2007-10-16 PWM closes feedback loop in intelligent SMPS
Microchip's new MCP1631 PWM provides a means to close the feedback loop in SMPS that use MCUs for general system intelligence and control.
2014-10-28 Practical feedback loop analysis for boost converter
The boost converter belongs to the family of indirect energy transfer converters. This application note describes how to select the placement of poles and zeros with several rules.
2007-05-18 Power detector targets closed-loop 3G handset apps
Maxim Integrated Products introduces the MAX2204, a linear power detector for mobile applications designed to compensate for temperature and process shifts.
2008-04-14 Position sensors deliver loop-powered operation
Macro Sensors has introduced a DC-operated position sensor that is spring-loaded and offers a two-wire, loop powered 4-20mA operation commonly used with current-operated process controllers and recorders.
2010-06-23 PLL synthesizer cuts need for active loop filters
Analog Devices Inc. has released a PLL synthesizer that can be used to directly drive high tuning-voltage external voltage-controlled oscillators, eliminating the need for active loop filters.
2006-05-02 PLL solution verifies complete closed loop noise
Xpedion announced GoldenGate, a transistor-level phase-locked loop solution for verifying complete closed loop noise and jitter.
2001-09-27 Phased locked loop acquisition using a swept local oscillator
This application note describes a method for achieving a rapid locked frequency with a narrow tracking bandwidth over a wide range of unknown input frequencies.
2001-05-15 Nested loop optimization on the TMS320C6x
This application note describes the process used to develop and optimize nested loops for Texas Instruments' TMS320C6x DSP family.
2012-04-05 Micro-loop mirror design ups silicon chip performance
Integrated Si/III-V lasers can take advantage of low-loss silicon waveguides, while addressing the problem of low light emission efficiency that silicon devices typically have.
2003-05-27 Measuring the loop bandwidth of a PLL
This application note describes a technique for measuring the loop response (amplitude and phase) of a PLL.
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