26 Threads found on edaboard.com: Analog Pulse Width Modulation
if you at the Microchip example programs
Microchip Technology Inc. is a Leading Provider of Microcontroller and analog Semiconductors, providing low-risk product development, lower total system cost and faster time to market for thousands of diverse customer applications worldwide.
you will fi
Microcontrollers :: 19.05.2011 16:36 :: horace1 :: Replies: 1 :: Views: 640
Hii...generally, the pwm(pulse width modulation) is defined according to the analog input signal as per the definition..but can the digital input data be given as input to the PWM???? So please clarify it.
Digital communication :: 12.06.2012 00:54 :: sridivya pathapati :: Replies: 6 :: Views: 489
Besides analysing the circuit, the first point would be to check the results against expectable non-linearity according to AD790 specifications, e.g. "propagation delay versus overdrive".
Generally, no analog PWM modulator can be perfect. Please tell your detail results to allow a meaningful discussion. It would be also interesting how you actu
Analog Circuit Design :: 19.06.2012 03:10 :: FvM :: Replies: 27 :: Views: 1093
Using a sawtooth signal to generate pulse width modulated signal
where we compare the sawtooth with the input analog signal
if the sawtooth > signal then comparator output = 1 state
if < then comparator output = 0 state
So the comparator output pulse duration depends on the signal sample level
What the (...)
Digital communication :: 27.12.2005 07:29 :: yousif :: Replies: 1 :: Views: 1137
could u guys tell me
i) advantage of pulse modulation over analog communication such as FM,AM etc...
ii)generally,it is said that pulse modulation occupies more bandwidth when compared to analog modulation it true?if so why?
iii)some discrete (...)
Digital communication :: 05.01.2006 08:23 :: elecs_gene :: Replies: 3 :: Views: 1483
Using schematic entry, cascade three 4 bit counters together for 12 bits. Hook a clock up to them. Run the outputs into the A set of input pins on 3 cascadedd ttl 7485 comparators. Set the comparators B input pins to a value appropriate for the duty cycle you want. 12 bits counts 0 to 4095. So setting the B pins to 2047 will give a 50% duty cycle f
Software Requests :: 20.05.2007 00:25 :: jhbbunch :: Replies: 1 :: Views: 270
Do you actually know what is modulation index and what are the differences betwen analog and digital modulation ???
Electronic Elementary Questions :: 14.01.2008 13:54 :: gnjus :: Replies: 4 :: Views: 1375
can u give me a schematic diagram for PWM??
can you give me more detail? will u do analog or digital? any feedback?
Power Electronics :: 13.03.2011 11:30 :: eiphan :: Replies: 5 :: Views: 762
You're mixing three losely related points in your last post. Consequently there's no reasonable answer to it.
Referring to your original question, the modulation input is varying the threshold of the comparator ending the output pulse. Insofern, the instantaneous value of AC voltage matters, it's like being sampled. Unfortunately, the modulaion
Analog Circuit Design :: 11.07.2011 06:54 :: FvM :: Replies: 5 :: Views: 1680
Yes it is possible. There is also several methods to acomplis this.
You can get an slight overview over different types here.
Microcontrollers :: 14.09.2011 10:33 :: Prototyp_V1.0 :: Replies: 1 :: Views: 322
You can also check this article
How-to use PWM to Generate analog (or analogue) Voltage in Digital Circuits
Digital Signal Processing :: 15.01.2012 07:42 :: alexan_e :: Replies: 4 :: Views: 1184
Here are some papers on class D power amplifier
AES 4917 - Paralleled Phase Shifted Carrier pulse width modulation (PSCPWM) Schemes - a Fundamental Analysis.
AES 4446 - A Review and Comparison of pulse width modulation (PWM) Methods for analog and Digital Input (...)
Professional Hardware and Electronics Design :: 30.06.2003 09:19 :: cesare :: Replies: 15 :: Views: 7267
Please give an example of ?PWM is applied in analog architecture? so I can understand what you mean. Aren't pulses always digital?
Analog Circuit Design :: 24.08.2004 16:00 :: Ante :: Replies: 8 :: Views: 2735
Ring oscillators are often used as part of a PLL for clock and data recovery, frequency synthesis and clock synchronization. Additionally, ring oscillators have both digital and analog features which make them useful for data conversion tasks such as phase and pulse width modulation.
RF, Microwave, Antennas and Optics :: 17.05.2005 02:59 :: vagarwal :: Replies: 2 :: Views: 995
A good begin is try to find applications notes of manufacturers:
Find this in:
and some others, this topic is find a lot in applications note
Hobby Circuits and Small Projects Problems :: 20.08.2005 13:56 :: leomecma :: Replies: 6 :: Views: 2044
A class D amplifier is a power amplifier where all power devices are operated in on/off mode. Output stages such as those used in pulse generators are examples of class D amplifiers. Mostly though, the term applies to devices intended to reproduce signals with a bandwidth well below the switching frequency. These amplifiers use pulse (...)
Electronic Elementary Questions :: 02.05.2006 02:46 :: ArjunSC :: Replies: 4 :: Views: 1482
Smooth transition can be achieved with PWM (pulse width modulation) ..
Take, for example, PICAXE microcontroller .. One of its fuction is to output a PWM signal in the range of 0% to 100% (controlled by a number from 0 to 1023) ..
If you connect red LEDs directly to this output and connect blue LEDs through an inverter to the same (...)
Hobby Circuits and Small Projects Problems :: 05.09.2006 20:56 :: IanP :: Replies: 1 :: Views: 1485
Do u want to generate sine wave?
if the answer is yes then there are two different methods of doing it.
one is to use a DAC (digital to analog converter)with a controller and the other one is to use PWM(pulse width modulation) with an RC filter.
Microcontrollers :: 11.02.2007 22:20 :: waseem :: Replies: 6 :: Views: 2868
An application-specific integrated circuit (ASIC) is an integrated circuit (IC) customized for a particular use, rather than intended for general-purpose use.
So I assume that you know the difference between analog IC and digital IC. It quiet same.
A digital ASIC is comprised with the digital section of the design and analog ASIC controls the a
ASIC Design Methodologies and Tools (Digital) :: 03.04.2008 08:20 :: ariyan :: Replies: 1 :: Views: 715
have a look at "pulse width modulation Demonstration for the 18CXXX" on
Microchip Technology Inc. is a Leading Provider of Microcontroller and analog Semiconductors, providing low-risk product development, lower total system cost and faster time to market for thousands of diverse customer applic
Microcontrollers :: 07.05.2011 05:21 :: horace1 :: Replies: 1 :: Views: 1694
how to generate the sinewave pwm using compare mode in ccp for ccs compiler.. please help me :-D
You want to generate SPWM by comparing sinusoidal and triangular wave. But, triangular wave at frequency 1kHz is high that PIC speed can't generate using DAC
Microcontrollers :: 27.09.2011 12:34 :: engshahrul :: Replies: 2 :: Views: 1261
I need to design PWM Power amplifier.I want to know what is the good starting point to get basic ideas of the circuit.
I have knowledge about Power amplifiers for analog input but I'm not sure whether these PA's can also be used for PWM PA.If so, what modifications should I make to analog PA's circuit to work as PWM PA.
Please help me
Analog Circuit Design :: 28.07.2012 19:25 :: praveen450 :: Replies: 3 :: Views: 344
Old analog television broadcast is vestigal sideband AM. The modulation polarity is inverted, so impulse noise tends to cause dark speckles instead of bright speckles. That hides the noise pretty well.
RF, Microwave, Antennas and Optics :: 14.08.2005 17:19 :: echo47 :: Replies: 4 :: Views: 634
Yes, the reason why linearity is important today is because the sigma-delta modulation makes phase pertubations. The noise fequency shaping shift the noise in the range where it is filtered by the analog loop filter. The nonlinearity violate the frequency shaping effect. The noise comes up in the frequency range where the loop gain and the (...)
RF, Microwave, Antennas and Optics :: 10.03.2006 18:09 :: rfsystem :: Replies: 13 :: Views: 1319
Well, the only thing i can think of is doing what the old analog synthesizers used to do: an envelope with a fast attack.
Just use a sine table and an array containing the envelope values. At every sample instance multiply corresponding values of each and use that as the pulse width.
However this sound will be very far fr
Microcontrollers :: 03.08.2011 05:55 :: amaze1 :: Replies: 3 :: Views: 545
I think you will use the 555 as pulse width Modulator and put modulation into pin 5 of the 555,
and yes you could do it with small fm tx/rx or maybe infra red or any analog transmitter from any audio source..just have to couple pin 5 and some level adjustment
Hobby Circuits and Small Projects Problems :: 08.06.2013 09:58 :: dian :: Replies: 4 :: Views: 578