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34 Threads found on Pll 4046
Hi, I am trying to simulate the 4046pll in Proteus. The moment I short PIN 5 to GND and VCOIN (PIN 9) to GND the VCOOUT (PIN 4) keeps on generating 1kHz irrespective of the values of C1, R1 and R2. Please help me why is this happening, i.e. changing R1 and R2 should change the freq at the VCO OUT but it is not, WHY??? Circuit is attached be
I haven't built one quite like it but your 'significant' amount of noise in reality is probably very small, in many other applications it might be considered normal. I would guess it is less than 1mV. Things to try: 1. it is possible that the hiss is originating in the LM386 which is a notoriously noisy device. Check that when you inhibit the pll
sh-eda, I am not sure if this answers one of your questions: Are you aware that signals of the pll transfer function are not voltages but the PHASE? That means: The VCO acting as an integrator regarding the phase and, thus, contributes the order n=1 to the overall transfer function. That means: With a first-order loop filter the pll order is n=2.
Hi, I am looking for an IC similar to 565 or 4046 to use as pll to demodulate FM broadcast signals. (The problem is that the 565 is obsolete and I cant find any place around to buy some. the problem with 4046 is that it works with square wave and I need to have it worked by sinusoidal wave) If you know other IC which are available (...)
the dividers are quite big according to the schematic. I would suggest to install instead of the quartz oscillator another VCO using a new 4046, which's output connect to the input of your pll's input.
Hi, I have to do some simulations with the pll in object, but i can not find the model in microcap/spice. I've found the model in Proteus, is there any way to export this in model in microcap?
The 7046 appears to work about the same as the 4046 pll IC. Also consider whether the 567 (tone decoder) might be suitable. 50 Hz is a low center frequency. It ought to be feasible although you won't get immediate lock. It may take several cycles. 50 Hz requires a large RC product. Consider using resistance over 100 ohms. The reason: If you us
hi it's not problem in pll u can use vco mode on it , but what do u mean in infrared what do u want from it 66304
hey, thanks for the information, yup i know 74HC4046 is not a micro-controller, just using it for the 1st time to control the speed of a DC fan... do u have any suggestion or design that i can use DC fan speed control using pll and infrared..... i'm really confused how the design should take place because i'm using this IC for the 1st time...i wil
Have you looked at the 4046 CMOS device, which was available from many different manufacturers? It has a built-in VCO, but you can also use the pll with external signals.
Hello friends, We are using one pll IC (CD 4046) in our circuit to generate output voltage in DC corresponding to the phase difference between two i/p square signals.One is the VCO from pll and the other one is from outside. CD4046 pdf, CD4046 description, CD4046 datash
A pll like a 4046 would do the job, except the 4046 doesn't go quite that high in frequency. A pll like TLC2934 has a sufficient VCO frequency range, but not the specified lock range. Generally, the dynamic pll behaviour for wide frequency range is rather poor due to the bad matched loop filter. It (...)
I am trying to get a simple frequency multiplication scheme to work, but am having trouble getting the pll to lock. Background:I am sampling (frequency measurement) my signal at 1Hz, I can not sample any slower, and need to get a measurement resolution of 0.1Hz minimum. My input signal goes from 0-1kHz, so at the very low frequencies i can not a
Using two signal generators at the input (pin 3 and 14), varying the frequency of one generators you should see pulses at the comparator output (pin 13), and also when the signals at the input are in phase should see pulses output at pin 1. Activity on pin 1 means your pll is locked. In the same time just for information can take a look to the outp
You can try to use the internal VCO of 74HC4046, which is about this frequency range. For your application you can use the same 4046 pll circuit, using an LC oscillator for 100kHz reference frequency (no crystal), which will be your frequency step. 74HC4046 phase-locked-loop
The free-running frequency should be closer to the target frequency .. Also, have a look at the way the LPF is calculated in examples at: IanP :wink:
Hi, I want to design a pll oscillator that it has sine wave out put. To touch this I think,I have to filter output of 4046. Am I right? My operating frequency is 1.1MHz. So I want to design and implement 1.1 and 3.3 MHz oscillators. I want to use pll synthesizer or devider. please help me on these issues. Good Luck.
There's no lower frequency limit by 4046 specification. Lock time is ruled by general pll theory, in practice it depends on initial VCO frequency, utilized phase detector, loop gain, filter characteristic. Both 4046 phase detectors have digital inputs, they can work with any input signal keeping the CMOS level specification. An OP or (...)
Hmmmmm. perhaps you do not fully understand the concept of a pll. The 4046 has a VCO whose frequency is determined by the external capacitor C1, and the tuning voltage "VCO IN". It looks like the VCO wants to operate in the 10 KHz to 500 KHz region, depending on the C1 value chosen. I assume you are using a capacitor C1 that is moisture sensi
Hi, m trying to implement pll for FSK demodulation. NE565 is very simple in use and has very simple formulae bt the problem is that m nt going on hardware. i just need to simulate first. i tried Proteus bt proteus unfortunately doesnt has a model for NE565.... see 'pic1' ...... so i need an NE565 model or whatever is required to make it run ..... i
So far I used 4046, and there are a few tutorials for design with steps: calculating the loop gain and evaluating stability etc. For a charge pump phase detector like in 74hc9046 what are the differences in design? Could you please recommend a tutorial/ design method? [I need to know to calculate by hand, so I won't use the DOS software from
Hello, I need to use the 4046 pll, and i don't know how to choose RC values that are optimum to minimize jitter&noise of the VCO? In general, should I use a high C value, thus charging/discharging the cap with higher current, or use a lower C ? Because I need a narrow VCO domain, offset should be used so the VCO range doesn't start from
You can use this program to compute the loop filter component values
I'm using the 4046 pll with type 2 phase comparator (I need full VCO range lock) with external VCO, at about 100kHz. To make a stable pll i use the classical lead-lag filter with 2 resistors and 1 cap with enough damping. The question is how I can attenuate enough the pulses from the phase detector that reach the VCO input ? If I damp (...)
Are the 567 and similar pll ICs made any more? If so, which company has them? All I can find on the web is surplus parts vendors selling them.
The most commonly used frequency multiplier is the pll. You can find a nice tutorial on
Filter design in any pll system is very important .. Here you will find detailed desription (including several examples) on how to design LPF filters using 4046 ICs: "Filter Design for the HC/HCT4046A" Regards, IanP
For what purpose will you use a 4046 with th 16F877 ? A phase locked loop is used to synthesize frequency, i.e. multiply frequency. Some PICs have an internal pll to multiply the frequency of a crystal to be used as a main clock. If it is the case, the 4046 has a maximum operating frequency output of 1MHz @ Vdd = 5V, which is too low for (...)
Hi ALL, I use "4046 Chip " as a pll with a reference frequency of 50 Hz " Power Frequency" with a divider in feedback N=60 "two 4017 Chips" and using Phase Comparator 2 to obtain zero degree phase shift between input and output when in lock, the VCO is a wave generation circuit consisting of "ICL8038 Chip" linear triangular VCO,The problem is clos
Hi, Try also this link (hope it * by t
I want to use 4046 phase-locked loop IC. to generate 12.0MHz (for MPU. clock) from 15,625Hz PAL-B Horizontal Sync. with phase-locked at rising edge. (to make an OSD.) Anyone have the circuit? Regards, ZeRoN
".... The pll is a frequency-to-voltage converter of a different type than we have met before." "Q. How do you make a frequency-to-voltage converter?... Designing pll systems is beyond the scope of this discussion, but if a 4000-series CMOS pll, the 4046, is used just as a phase detector (its VC
this site is extremely good for beginers
:cry: I am trying to create a frequency synthesizer in PSPICE using the pll method. All of the models that I am trying to use are not in my library ie LM565,LM566,LM555. What way can I overcome this in PSPICE?