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Sep 30, 1.
HEFBP, BG-ELECTRONICS HEFBP, HEFB, HEF
Apr 21, 12 0. Hi all Hef440 would like to do a frequency multiplier synchronized to the frequency of datasueet mains i. Sep 30, 2. Apr 5, 18, 3, Hello, When multiplying a frequency, the variations on the reference frequency will also be multiplied by the same factor. Dahasheet is the complete PLL circuit build?
Do you have a complete schematic? Did you have a look at the synthesizer schematic on page 19 pf the datasheet? Sep 30, 3. Sep 30, 4. If it is useful I can draw the whole schematic Edit. Sep 30, 5. Hello, Did you use the schematic for the synthesizer in the datasheet? The divider in your case is the Sep 30, 6. Sep 30, 7. Jun 19, 2, Your loop filter lacks the lead-lag characteristics for solid lock, it’s “hunting”. Note R4 in the simple example, this allows some of the phase detector signal to go through without phase shift, this allows it to lock.
Sep 30, 8. Sep 30, 9. I would ditch het4040 those extra parts and go with the simple filter in the data sheet.
Frequency multiplier HCF synchrnized with mains frequency (50Hz)
Thinking the main job of the filter is to “attenuate the 50 Hz” is not correct, you are going to drive yourself nuts adding all this unnecessary complexity.
Sep 30, I suggest building a breadboard of the simple filter, with pots in place of the resistors, play with it to get an intuitive feel for what’s going on.
Then read the data sheet and do the painful math to select the components. Sep 17, 8, 2, At lock, the phase comparator 2 output is in the open circuit state and the VCO control voltage is held substantially constant by the capacitor of the simple low-pass filter shown in the datasheet for the CD Your more complex filter circuit has no such capacitor.
I think when the filter circuit input is open-circuited the opamp U2 output will not be held at the required level but instead will be determined by the opamp bias conditions offset etcleading to a frequency offset. Oct 1, Mar 14, 20, 5, I used this CD model. R2 provides some lead compensation to prevent overshoot and hunting. As you can see, the loop appears stable after about 1. At that point the VCO output is dztasheet steady CD PLL div I’m not sure why the data sheet values don’t seem to work.
I just adjusted the values until the simulation was stable. A larger time-constant usually works fine.
It just makes the step response at start-up or with a change in divider ratio longer. So if you can tolerate a longer step response, you can use a larger time-constant to help insure stability. To speed the simulation I take the counter out of the loop and increase the value of C1 by a factor of The loop dynamics are essentially the same and the simulation is much faster without the counter in the loop.
Oct 3, Again the output is not stable: I have changed values to the one proposed by crutschow. What is the time constant of your LPF?
HEF4040 Datasheet
What is your trigger signal for the oscilloscope? Frequency multiplier Posted by LolaMM in forum: Frequency Multiplier Posted by Jadams in forum: Battery charging time with AC frequency 50Hz Posted by satcom in forum: Frequency 50Hz or 60Hz Posted by ckchamb in forum: You May Also Like: This ADC is ideal for applications requiring a resolution between bits.
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