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What is pulse width modulation (PWM)?
Pulse Width Modulation (PWM) is a way of digitally encoding analogue signal levels. Through the use of high-resolution counters, the duty cycle of a square wave is modulated to encode a specific analogue signal level. In more general terms, a switch is op
total search1549 articles
2005-06-16 VF control of 3-phase induction motor using space vector modulation
This app note discusses the SVM digital implementation for VF control using Microchip's PIC18FXX31 8-bit microcontrollers
2005-06-02 VCSEL with 12.5Gbps modulation
Panasonic announced the development of its 850nm AlGaAs/GaAs Vertical Cavity Surface Emitting Laser capable of high speed 12.5Gbps modulation at an operating current of 8mA
2003-08-29 Using Two-Point Modulation to reduce Synthesizer Problems when Designing DC_Coupled GMSK Modulators
This application note discusses the problems encountered when designing GMSK modulators with respect to the characteristics of PLL frequency synthesizers, and illustrates how two-point modulation can be used to solve them.
2002-12-09 Using two-point modulation to reduce synthesizer problems when designing dc-coupled GMSK modulators
This application note describes the problems encountered when designing GMSK modulators with respect to the characteristics of PLL frequency synthesizers
2001-09-06 Using two-point modulation to reduce synthesizer problems when designing dc-coupled GMSK modulators
This application note discusses the problems encountered when designing GMSK modulators with respect to the characteristics of PLL frequency synthesizers and illustrates how two-point modulation can be used to solve them.
2001-04-19 Three and four phase brushless dc motor controllers using pulse-width modulation
This application note describes LSI Computer Systems' five motor circuits (LS7260, LS7261, LS7262, LS7263 and LS7264) that drive brushless DC motor controllers.
2013-12-19 Startup boasts advanced digital modulation tech
Magnacom will use an FPGA board to deliver 10dB signaling advantage compared to QAM4096, the most powerful version of the quadrature amplitude modulation scheme widely used in communications today.
2004-12-15 Spectrum analyzer spans time, frequency, modulation domains simultaneously
Tektronix's new RSA3408A spectrum analyzer debuts at a time when RF systems are racing up the curve in complexity and scope.
2001-04-24 Simulating direct laser modulation with the MAX3930
This application note is intended to establish a simulation model for transient analysis and address driver-to-laser interface using Maxim's MAX3930 direct modulator for laser diodes.
2005-10-26 RF generators get better radar pulse-modulation performance
Anritsu is adding pulse modulation enhancements to its existing MG3690B signal generators. The MG3690Bs provide guaranteed 21dBm signals (at 20GHz), with -94dBc/Hz phase-noise (at 1kHz offset), while typically switching at 5ms/point.
2000-06-26 Pulse-width modulation in Xilinx programmable logic
This application note demonstrates how to build a variable PWM waveform using a counter and a storage register.
2010-05-24 Power amps support complex modulation schemes
Anadigics Inc. has launched new power amplifiers that support complex modulation schemes, such as those used in W-CDMA, HSDPA and LTE air interfaces.
2009-01-26 Polyphase modulation using a FPGA for high-speed applications
This application note reviews and analyzes a polyphase modulation scheme that generates high-frequency intermediate frequency (IF) carrier signals in digital IF modems using an Altera FPGA.
2004-02-02 Polar modulation in mobile PA design
Polar modulation is a useful technique for improving the efficiency and stability of a wireless transmitter when size and battery life is important.
2005-12-16 Polar modulation has right stuff
Polar-modulation solutions for cellular radios are emerging as the de facto technique in GSM/Edge market.
2005-03-31 Photonic laser diode modules offer TTL modulation input
Photonic's new laser diode modules are suitable for biomedical instrumentation, imaging, spectroscopy, fluorescence sensing, microscopy and other emerging technologies.
2004-11-30 Photonic adds TTL modulation options to laser diode modules
Photonic Products announced that they have added TTL modulation options to it's Photon Module range of laser diode modules.
1999-11-18 New techniques for complex modulation analysis
This application note examines the wireless applications of a new acquisition and display technology ? the digital phosphor oscilloscope.
2006-06-02 modulation mode, PFM mode, synchronous rectifiers, SYNC pin, DC/DC buck converter, DC/DC converter, Monolithic DC/DC, Intersil Corp.
This document describes the setup procedure for the ISL8010EVAL1 Rev A board.
2004-12-17 Modulation analysis for transient RF signals
This app note brief examines several measurement challenges involved with modulation analysis for RF communications signals and the comprehensive set of tools that the Tektronix RTSA provides to address these problems.
2002-04-29 Maxim laser driver provides 60mA direct-coupled modulation current
The MAX3850 3.3V laser driver from Maxim Integrated Products provides 5mA to 60mA of direct-coupled modulation current (80mA ac-coupled) and 1mA to 100mA of bias current, while consuming 116mW of power.
2001-10-10 M16C/62: Pulse width modulation
This application note describes the operations of PWM for the M16C/62 microcontroller. A sample assembly program is presented to demonstrate the basic functions of PWM.
2002-01-25 LeCroy power tester performs modulation and line power analysis
Aside from performing standard power measurements, the PS354 also tests harmonic distortion against standardized templates for class A to D equipment.
2005-01-14 Laser modules with TTL modulation input capabilities
BFi OPTiLAS has announced additions to its' range of laser diode modules with the addition of TTL modulation input capabilities.
2001-05-08 Implementing the high-speed modem with multidimensional modulation using the TMS320C542 DSP
This application note presents a high-speed modem solution with multilevel and multidimensional modulation using Texas Instruments' TMS320C542 DSP.
2009-01-16 Implementing OFDM modulation for wireless communications
This application note discusses various implementation schemes for orthogonal frequency division multiplexing (OFDM) modulation and demodulation.
2014-02-06 Implementing FSK modulation, demodulation
Learn about logic level implementation of binary FSK modulator and demodulator using a phase-locked loop device.
2006-03-23 I/Q modulation generator provides 300MHz memory clock
Rohde & Schwarz announced the R&S AFQ100A I/Q modulation generator, which provides a memory clock of 300MHz combined with a memory depth of up to 1Gsample.
2010-01-20 High quality, all-digital RF frequency modulation generation with the ADSP-2181 DSP and the AD9850 direct digital synthesizer
This application note describes the implementation of a high quality all-digital FM RF generator for use with audio frequency input signals.
2000-06-16 Frequency modulation on L4981B
This application note demonstrates the L4981B PFC controller as a useful device to solve the EMI problems using the frequency modulation technique, which allows spreading the noise spectrum over a wider range, reducing in this way the peak of the associated energy.
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