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Phased Locked Loop (PLL) Circuits
PLL's:   #'s - O       P - Z


Last Updated: October 18, 2017 05:04 AM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Phase Locked Loop Frequency Synthesizer Demonstration Board-  This document details the evaluation procedures and usage of the Hewlett-Packard HPLL-8001 demonstration circuit board and evaluation software.  All operating conditions and electrical characteristics of the HPLL-8001 are described in the current version of the data sheet__ HP Application Note 1145

Phase locked loop fundamentals-  Application Note__ MiniCircuits.com

Phase Locking & Tuning-  Schematic + software links __ Jan Kolar

Phase-Locking ULNs for Optimum Performance-  Phase-locking two ultra-low noise oscillators is an effective way to achieve excellent noise performance both close-in and at the noise floor.  To illustrate the technique, this note describes a PLL using a 5 MHz ULN as the reference and a 100 MHz ULN as the locked oscillator.   __ Contact:  Charles Wenzel of Wenzel Associates, Inc.

Phase-sequence indicator uses few passive components-  07/06/06 EDN Design Ideas:  Debug three-phase power-line wiring with this easily constructed circuit __ Circuit Design by Metodi Iliev, University of California—Berkeley

PLL Exciter-  This is a PLL controller that works with the VCO/Modulator that I designed.  Use these two modules together for a complete baseband-capable exciter unit.  This PLL controller features a rock-stable crystal controlled reference, in conjunction with a programmable dividing network which allows the transmitter to be tuned in 100Khz steps from 79.9Mhz to 109.7Mhz by means of digital thumbwheel switches.__ Electronics DIY

PLL Filter Blocks Undesired Frequencies-  12/15/10 EDN Design Ideas:  Block frequencies such as interference from ac mains.  [Design Ideas by Stephen Kamichik, Ile Bizard, PQ, Canada __ Circuit Design by Stephen Kamichik, Ile Bizard, PQ, Canada

PLL FM Transceiver-  TA8122N and PIC16F84 based FM PLL Transceiver__

PLL FM Transmitter-  This is PLL FM Transmitter using SAA1057 chip.  Transmitter can be operated from a PC through LPT port, or using a PC software as a driver.__

PLL FM Transmitter-  This new FM transmitter is very simple and doesn't need any RF tuning.  First of all , we have used an integrated VCO: The POS150 from Mini-circuits.  This excellent RF circuit covers all the FM Band in a voltage range of 4V to 8V.  The Kvco factor is very stable all over the FM band, (08/08/08) __ Designed by Michel P

PLL FM Transmitter using LMX1601, ATtiny2313 AT90S2313-  Here's a PLL FM Transmitter using LMX1601, ATtiny2313 or AT90S2313 microcontrollers.  The common characteristic of all of the previous low power FM transmitters I've built over the decades, is that their operating frequency is determined by an LC resonant circuit.  Some of them had excellent stability, some of them didn't, but I had always wanted to make one that is crystal controlled.  Various schemes had been considered from time-to-time, including the direct approach of modulating the load capacitance of a crystal oscillator, a whimsical phase modulation scheme involving a phase shifter, some balanced modulators, and limiting amplifiers, and at times, the down-to-earth and sober approach of modulating a VCO within a phase locked loop (PLL).  While browsing Digikey's online catalog, I found the LMX1601 frequency synthesizer chip and thought: "Just maybe, the PLL approach is finally within my grasp." The LMX1601, which apparently was designed for use in cell phones, includes everything need to make two phase locked loops except for the VCOs.  More importantly, one of the PLLs, specifically the "AUX" PLL, is specified to work in the FM broadcast band.  The LMX1600 and the LMX1602 were also considered, but the LMX1601 was selected because it has a "500 MHz option", meaning that it can work down to about 50 MHz.__

PLL forms Simple Circuit MSK Demodulator-  12/17/98 EDN Design Ideas:  In minimum-shift-keying (MSK) signaling, two frequencies that differ by the bit rate represent a one bit and a zero bit.  Normally, the frequency shift occurs at the peak of a cycle, so that neither the amplitude nor the slope of the waveform shows a discontinuity.  We needed to transmit 300-baud ASCII text using ultrasonic transducers.  These devices have a very narrow bandwidth around their 25-kHz resonant frequency, making MSK the obvious choice for modulation.  A zero    Page includes several designs.  Scroll to find this one __ Circuit Design by J Tom Napier, North Wales, PA

PLL IC Forms Simple Circuit Digital Phase Shifter-  01/04/96 EDN Design Ideas:  A phase shifter is a vital block in some signal-processing and clock-distribution applications.  Another important application is in benchmarking digital phase detectors.  The circuit in Figure 1, an especially appropriate one for evaluating phase detectors, uses only two industry-standard ICs (CD4046 and LM311].  It relies on digital PLL techniques __ Circuit Design by Haldun Karaca, DE University Bornova, Izmir, Turkey

PLL implements FPGA-based SDRAM controller-  EDN Design Ideas:  March 26, 1998  [   NOTE:    FILE has multiple design, scroll for this one.]  As FPGA capabilities increase and time to market decreases, FPGAs gain more acceptance for implementing both data and control paths. Thus, they find wide use as controllers and datapath glue logic for fast-page DRAMs. __ Circuit Design by Eddy Debaere, Barco Graphics, Ghent, Belgium

PLL Module-  This schematic originally comes from a Dutch magazine called Free Radio Magazine in the mid-eighties.  It's just a PLL nothing more, nothing less.  The resistor named R can be replaced by a 50 Ohm type if the power supply is 5 Volts.  The dividing ratio can be programed with IC2.  For the ratios see table 1.  Example: If the input signal has a frequency of 10MHz, the crystal frequency output is 10.240-10.000=0.24.  Now looking at table 1, we see we can make 24 by combining the 8 and 16 program switches (pin 11 and pin 12 closed to Vcc). __

PLL Oscillator -  This PLL was first published in March 1983 in Free Radio Magazine and was re-published a year later in the same magazine.  It uses the well-known 4046 as PLL and a CD4059 as programmable divider. __

PLL Solid State Tesla Coil 1-  My first SSTC which works well enough to show to anyone.__

PLL SSTC 1.5-  The PLL SSTC 1 has been given an extreme makeover.__

PLL Stereo FM Transmitter-  The circuit shown here is of a good Stereo FM transmitter that can transmit high quality signals up to a range of 70 feet.  The circuit is based on BH1417 PLL stereo transmitter IC from Rhom semiconductors.  The IC has separate audio processing sections for the left and right channels, pre emphasis circuit for improving signal to noise ratio, crystal control circuitry for accurate frequency locking, multiplex circuit for making sum (left plus right) and difference (left minus right) {see this article for better understanding Stereo decoder circuit} etc.  Another important feature of this IC is that the transmission frequency can be set using a 4 channel DIP switch.  The IC can be powered from anything between 4 to 6V DC and has an output power around 20mW.  At full output power the circuit consumes only 20mA and has a channel separation of 40dB.There are 14 possible preset transmission frequencies, starting from 88.7MHz and incrementing in steps of 0.2MHz that can be selected using the DIP switch.  The PLL circuitry of the IC is so precise that there is practically no frequency drift.__

PLL Stereo FM Tuner-  FM radio which uses PIC micro-computer PLL system__

PLL synchronizes power-supply IC-  07/16/98 EDN Design Ideas:  It is often desirable to synchronize a switching power supply to a system clock or to a second supply.  If the power-supply controller has no synchronization pin, you can add a low-value resistor in series with the oscillator capacitor, thereby developing a synchronization    FILE has several circuits, please scroll to find this one __ Circuit Design by Kurk Mathews, Linear Technology Corp, Milpitas, CA

PLL synthesizing oscillator 1-  The PLL synthesizer oscillation circuit to introduce here is using the PLL frequency synthesizer (MB87014A).  It is possible to make oscillate the stable high frequency signal.  The PLL is the abbreviation of Phase Locked Loop.  In the operation of the PLL, it compares the frequency of the reference frequency oscillator and the frequency of the voltage controlled oscillator by the phase.  When there is a difference of the phase, it works as if to control the VCO and to lose the difference.  It controls repeatedly (loop) like the oscillation frequency phase comparison voltage control oscillation frequency. __ Designed by Seiichi Inoue

PLL Synthesizing Oscillator 2-  In this page, I introduce the PLL synthesizer oscillator which used MC145163.  As for the operation principle of the PLL synthesizer oscillator, see "Principle of the PLL oscillator".  This IC for the PLL can specify a dividing ratio directly with the BCD.  The output of the BCD counter can be directly connected.  There is not a serial data generator, being necessary. __ Designed by Seiichi Inoue

PLL Synthesizing Oscillator 3-  I introduce the PLL synthesizer oscillator by MC14046B which can change the frequency.  The PLL oscillator can be made using three kinds pieces of the ICs like the figure above.  Because most of the functions are stored in the ICs, there are few, too, circumference circuits and the making is easy.  The BCD (Binary Coded Decimal) switch is used to change the frequency. __ Designed by Seiichi Inoue

PLL Tuning Module-  SAA1057 Dual-speed PLL designed for wideband FM transmitter. __

PLL using a TA7310P-  The resistor named R can be replaced by a 50 Ohm type if the power supply is 5 Volts.  The dividing ratio can be programed with IC2.  For the ratios see table 1.  Example: If the input signal has a frequency of 10MHz, the crystal frequency output is 10.240-10.000=0.24.  Now looking at table 1, we see we can make 24__

PLL-based converter controls light source-  EDN Design Ideas:  July 2, 1998 [   NOTE:    FILE has multiple design, scroll for this one.]  Using the circuit in Figure 1, you can digitally control the light intensity of a lamp.  The control loop is based on a PLL, in which the VCO comprises a light-to-frequency converter (TSL220) coupled to a light source that derives its drive from a switching regulator (L4970A).  The output of the phase/frequency comparator (4046) serves as the control voltage for the switching regulator.  The control voltage is proportional to the frequency error between the reference frequency (fREF) and the signal frequency (fIN) coming from the light-to-frequency converter. __ Circuit Design by Masso Gottardi, ITC-IRST, Trento, Italy

Programmable oscillator operates at 2 GHz-  05/11/00 EDN Design Ideas:  All wireless communication systems need a local oscillator.  Figure 1 shows a low-cost PLL circuit for the 2-GHz band for such applications as industrial, scientific, and medical (ISM]and satellite personal-communication systems (S- __ Circuit Design by A Navarro, M Rostami, and JN Matos, Instituto de TelecomunicaƧoes, Aveiro University, Portugal

RF Synthesizer (CMOS )-  Synthesizer based on available CD4059.  CD4046 and CD4060 ICs. __ Designed by Harry Lythall-SM0VPO

RF Synthesizer Uses Generic ICs-  06/24/10  EDN Design Ideas:  You can design a hardware-based frequency synthesizer with one inexpensive IC and a few passive components.  Such synthesizer chips are not always available, however, because they are typically single-sourced and are not in stock w __ Circuit Design by James B Wood, Inovonics Inc, Felton, CA

Rolled-Off Noise Source-  This is a circuit that generates white noise, rolled-off to drive earphones or a small speaker.  White noise creates is a "rushing" sound, which sounds something like air rushing by your ear (s).  White noise would be flat with frequency, and since this circuit rolls off within the audio range, I refer to it as "rolled-off" noise.  White (or rolled-off) noise __ Designed by Dick Cappels

Serial Interface for Truly MTC-C162DPLY-2N, 2 line X 16 char LCD display-  A serial interface and bias supply for the Seiko-Epson G1216N000 using an AT90S2313 because there just aren't enough applications examples for this display on the web. __ Designed by Dick Cappels

Series Connected Voltage Boost for a Battery Operated LED Lantern-  A circuit that goes in series with a white LED and a 1.5 volt cell to make > 3 Volts to drive a white LED __ Designed by Dick Cappels

Simple Circuit fix adds door-chime repeater-  05/13/99 EDN Design Ideas:  Electromechanical door chimes can enhance your home, but they are vulnerable to costly repair problems.  A defective pushbutton switch or a careless visitor can maintain the chime in an energized state for a prolonged period, thereby damaging the chime.  The circuit in Figure 1 prevents damage to the chime and improves the chime's effectiveness by repeating the chime strike for as long as the pushbutton remains depressed.  The circuit controls both front and rear chimes.  The heart of the circuit is timer IC2, which you configure as an astable multivibrator.  The timing components, R1, R2, R3, and C3, provide the required pulse widths. __ Circuit Design by Dennis Eichenberg, Parma Heights, OH

Software PLL locks VCXO to reference-  08/01/98 EDN Design Ideas:  (  FILE has several circuit ideas.  Scroll to find this one.) The circuit in Figure 1 provide as a precisely controlled clock signal.  The method modifies the controller's quartz oscillator such that the control voltage at point P1 controls the frequency.  A D/A converter using an R-2R ladder network connected to output port D generates the control voltage.  A precise reference-frequency signal connects to the controller's analog-comparator input, AIN0.  In this application, the reference frequency is 162 kHz (derived from a long-wave broadcast station).  You can use any other 10- to 200-kHz frequency. __ Circuit Design by Martin Ossmann, Philips Research Labs, Aachen, Germany

Software PLL syncs to line using Moving-average filter-  EDN Design Ideas:  08/20/2015  A software PLL with a jitter attenuator lends itself to AC-line filtering and many other applications __ Circuit Design by Dobromir Dobrev

Stereo Synthesizer-  Different frequency ranges appear at the two outputs, depending on the setting of the controls and create a stereo effect __ Designed by Ethan Winer

Synthesized HF Receiver-  This receiver was originally designed for simplicity and low cost, but, like other projects, it grew.  My receiver is now synthesized and the performance is quite comparable to many commercial designs. __ Designed by Harry Lythall-SM0VPO

Synthesizer Basics-  Very nice intro to synthesizers. __ Designed by Harry Lythall-SM0VPO

Two gates & a microprocessor form digital PLL-  04/14/05 EDN Design Ideas:  Low-frequency PLL needs just a processor and gates __ Circuit Design by Kenneth Martin, TareTronics Inc, Corinth, MS

Ultra-Fast Settling PLL with RF to 13 GHz -  Refer to User Guide UG-383 for details on running the tests and setting up the software.  , CIRCUIT EVALUATION AND TEST, CIRCUIT EVALUATION AND TEST __ Analog Devices from the Lab

Unlocked PLL Retains Locked Frequency-  07/20/95 EDN Design Ideas:  Using the PC2 in-phase comparator output, the circuit in Fig 1 keeps the unlocked, or free-run, frequency of a 74HC4046 PLL near the locked frequency.  With no signal input, the VCO output normally adjusts to its lowest frequency (one-half the locked frequency, f0].  In some applications, such __ Circuit Design by Karol Freed, HAC, Carlsbad, CA

Veronica 1W PLL FM Transmitter-  The VERONICA transmitter is a very stable, powerful, and high quality FM emitter.  Thanks to a PLL, the output frequency is controlled with DIP switches.  Output power is approximatively 1W with a single regulated 13.8v supply ! (see specifications) Features : * High RF output power : 1W * Full 87.5-108MHz range (100KHz increment).  * Very stable output frequency : Crystal reference & Phase Locked Loop.  * Professional input bandwidth (fully RDS compatible) * No complex tuning needed.  * High quality PCB * Full documentation & construction details available__

Wideband LO PLL Synthesizer with Simple Circuit Interface to Quadrature Demodulators -  A PC with the ADF4350 software is required to program the synthesizer to the desired LO frequency__ Analog Devices from the Lab

Wireless PLL Stereo FM TX with LCD-  Now you can use your MP3 Player to listen your favorite tunes through any FM stereo receiver.  Wireless FM transmitter wirelessly connects portable music players to your car or home stereo quickly and easily.  Just plug the FM Transmitter into the headphone jack of your MP3 or any audio source including iPOD, PDA, CD Player, Cassette player or connect it to your PC or laptop computer.  Tune your card stereo or receiver to the clearest FM frequency, and enjoy your digital music with full sound and convenience. __

PLL's:   #'s - O       P - Z


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