Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Yes, that sample hold and abalog divider makes the circuit a bit difficult. I will try both SH/Divider circuit, and switched capacitor filter alternative.
Ofcourse we have to wait for 1 cycle to end:)
I gave the LTC2644 example, and wanted to imitate behaviour with an analog circuit. If you check its datasheet, input to output waveform will be helpful to understand.
FvM,
Thanks for your reply and interest. That is correct, I want adaptive filtering.
About the output ripple, it must be less than 5% of output voltage (0-5V)
Settling time should be less than 5ms in any PWM input.
I will try Sample Hold circuitry, but if a simpler circuit exists, that will be...
Are switched capacitor filters compatible for this application? I was wondering if I could generate a clock from PWM signal, divide it and feed the clock input of filter.
Klaus,
Sorry for the mistake, I intended to write "lower frequencies".
For instance, using a 2.5Hz cutoff frequency RC filter would be OK, but if the source is at 500Hz, change of output will be slow, in hundreds of milliseconds range.
About the MCU alternative, this project will be a...
Hello Klaus,
My target is to convert duty cycle to analog value. Input is 5V PWM with varying frequency (and duty), output should be linearly proportional to duty, in the range 0-5V
Using a 5Hz-below RC filter is ok, but with higher frequencies, delay will be higher than acceptable.
Thanks!
Hello,
I need to convert a PWM to analog signal. But the issue is, frequency of PWM may change. So, RC-filter option is not preferred. What kind of circuitry would be appropriate for this?
By the way, there exists an IC named LTC2644, which operates exactly as I want, but not meeting my...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.