High speed cmos logic phaselockedloop with vco cd74hct4046a. The 4046 phaselocked loop pll chip is a fantastic chip to experiment around with. Design and experiments mouna ben hamed and lassaad sbita 164 c. Use a 10k resistor to couple the signal generator to the pll. The phaselocked loop pll is commonly used in applications that measure the frequency, amplitude, andor phase of a sinusoid in the presence of other signals or random noise. A single p ositiv e supply v oltage is needed for the c hip. A phaselocked looppll has a voltagecontrolled oscillatorvco.
Software tests 5g transport networks with millions of subscribers apr 30 2020, 2. For this purpose, i used a cd 4046 pll and a lm311 op amp to produce square signal input for pin 14. The 4046a, the 7046a and the 9046a pll circuits have digital phase comparators, chosen because they can be used in virtually every pll application. Pll using 4046 phase locked loop electronic circuits. A phaselocked loop pll has a voltagecontrolled oscillatorvco. The cd4046bc micropower phaselocked loop pll consists of a low power, linear, voltagecontrolled oscillator vco, a source follower, a zener diode, and two phase comparators. Reengineering the oscilloscope for embedded system development. Xilinx system generator serves as the software development. The type1 pd has an analogue multiplier which is simply xor for digital inputs whose low. The ability to integrate many moretransistors has enabled analogmixed.
For 1hz to 1khz input range, we design a vco to cover 10hz to 10khz, with some extra range on each end. Ken yap has added a new log for adventures with a stc89c52 development board. With 65khz res freq 153usec i would guess just a guess, plz the propagation delay. Whilst poring over 4046 phase locked loop data sheets, i noticed yet another subtle useful difference between the the later faster 74hc4046. Phaselocked loop design through the decades part 1 embedded. This application report provides the circuit designer with information on the use. It is used in a closed loop control to maintain a stable frequency.
Cd4046b cmos micropower phaselocked loop pll consists of a lowpower, linear voltagecontrolled oscillator vco and two different phase comparators having a common signalinput. Eine phasenregelschleife, auch als englisch phaselocked loop pll bezeichnet, ist eine. The back story is i inherited a trove of electronics component in which there was an incomplete breadboard with an op amp, a 4046 pll, a mc145151p2 frequency synth with a. Typical waveforms for pll using phase comparator 1. The 4046 has two phase comparators, and you need to take care to use the appropriate. Im new to the forum, so i hope this post is in the right place. Formulas are derived from a spreadsheet by philips. Problem measuring frequency and phase of the grid using. Practical electronicsic4046 wikibooks, open books for. Frequency multiplier for synchronization question type.
A tiny useful discovery about the 4046 phase locked loop chip. Neither one will be easily adopted to scanning function. Phase lock loop is a electronics feedback method to stabilize the desired output by comparing the phase of the reference. Phaselocked loop for your next electronics project. Software based phase lock loop arduino forum index. Objectives the objective of this experiment is to investigate the principles of phase locked loop pll. In this session of logic noise, we enter the realm of voltage control the simplest possible way, using the voltagecontrolled oscillator built into the 4046 chip. In this session of logic noise, we enter the realm of voltage control the simplest possible way, using the voltagecontrolled oscillator. Cd4046 is a pll or phase lock loop, it mainly consists of a vco and phase comparators. Free online engineering javascript calculator to quickly estimate the component values used for a 4046 vco with pll.
The hchct4046a pll with vco is a highspeed cmos ic designed for use in. As shown, the oscillator signal is fed into the comparator formed by ic1a and its output drives the. Cd74hct4046a high speed cmos logic phaselockedloop. Most of the advances in frequency,power per megahertz, and area are duesimply to advances in process technologyand would not be surprisingto anyone familiar with moores law. Digital phase locked loop induction motor speed controller. Most of the advances in frequency,power per megahertz, and area are duesimply to advances in process technologyand would not be surprisingto anyone familiar with moores. The phaselocked loop pll is a device with many interesting applications, including.
The 4046 is a digital pll the vco output is a periodic binary signal. The cd4046be is a cmos micropower phase locked loop pll in 16 pin dip package. Power management development kits rf wireless development kits. The 4046 cmos micropower pll,which rca introducedin the 1970s, is one. Of course, i wired the tilt sensors output to the 4046. How to make a 4046 pll work keiths electronics blog. A versatile building block for micropower digital and analog applications 5 3. Development of singlechip phaselocked loops plls has brought about an. The 4046 contains one voltage controled voltage that require external capacitor and two resistors, two differents phase comparators and a zener diode of 5. A versatile building block for micropower digital and analog applications 3 1 introduction phaselocked loops plls, especially in monolithic form, have significantly increased use in signalprocessing and digital systems.
Cd4046b cmos micropower phaselocked loop pll consists of a lowpower, linear voltagecontrolled oscillator vco and two different phase comparators having a common signalinput amplifier and a common comparator input. Cd4046be texas instruments pll frequency synthesis, 2. The ic4046 is phaselocked loop ic of cmos digital combined analog and digital chip. Construct the following circuit in which a cd4046be phase locked loop pll ic is configured as an fm demodulator that relies on the. Vco frequency have been developed with emphasis on the highfrequency. The mostcommon type of pll for soc applicationsis the frequencymultiplying pll.
This is a component in fm demodulation and modulation. A phaselocked loop or phase lock loop pll is a control system that generates an output signal whose phase is related to the phase of an input signal. Cmos phaselockedloop applications texas instruments. Frequency multiplier for lf measurements eeweb community. In fact, its so versatile that well spend the next three sessions exploring it. The vco signal and an input signal are sent vto a phase comparator which generates an error voltage part to any difference in frequency between two signals. Can anyone help me to use 4046 as frequency to voltage converter. For phase locked loop pll, we can have two types of phase detectors pd. The 567 tone decoder is perhaps most famous phase locked loop pll chip. The soc pll in figure 1 integratesmore than 25,000 transistors, whereasthe 4046 chip used roughly 5. Im trying to use the 4046s phase comparator 2, but the output isnt doing what id expect. The pll technology eliminates the costly rf transformers needed for circuits like the ratio fm detector and the foster seeley circuit. The circuit above is good for learning the full use of a small dual trace scope.
It consists of low power, linear voltage controlled oscillator vco and two different phase comparators. Even a simple pll freq synth with 4046 required better filters there, afaik back in 80ies. In fact, its so versatile that well spend the next three sessions. Backing off from the more complex circuit above and prototyping a simple audio band pll using only a single 4046 a ti 74hc4046 to be specific with appropriate r1, c1 and. The hef4046b is a phaselocked loop circuit that consists of a linear voltage controlled oscillator vco and two different phase comparators with a common signal input. Phaselocked loop design through the decades part 1. Typically a phase locked loop fm demodulator does not.