It also analyzes transistors characteristics such as voltage and gain. Exar, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. If the xr2206 is dead, i need an alternative discrete circuit. The collector current pulses cause the tuned circuit to. The relation is inversely proportional to one another, means as the frequency of the signal to be. The xr2206 contains a voltage controlled oscillator vco. The circuit uses either one of the timing capacitors c12, c8, c7, c6, c1 or c40. The application of these pulses to the tuned tank circuit will give amplitude modulation. The resulting amplitude modulation am waveform is then demodulated using an envelope detector circuit.
If the class c amplifier has an input power of w, the modulator must be. In fact, for 100% modulation, the power supplied by the modulator must be equal to onehalf the total class c amplifier input power. This application report discusses logiclevel implementation of fsk modulator and demodulator using a pll device hchct4046a. Increase the amplitude of the signal generator output voltage to 3 vpp at 1 khz.
Adjusting the amount of vr1 or the audio amplitude can change the percentage modulation. Class c amplifiers conduct for only a portion of the positive half cycle of their input signal. The meter is a perfect addition to any power supply, battery chargers and other electronic projects where voltage and current must be monitored. It does adopt the more usual positive central pin and the specification says to use 912v. Set the input signals of am modulator for the carrier of 250mvpp, 200 khz sine wave, and the audio signal of 150mvpp, 3 khz sine wave. Communication labi manual eceiv semester page 14 xr2206 modulator 16 15 14 12 11 10 9 8 7 6 5 4 3 2 1 1k r3 1 f c10. This is the most widely used type of am modulation. Monolithic integrated circuit function generator laboratory. Spice simulation of fm modulator implemented with a precision sine waveform generator ic xr2206. In fact, all radio channels in the am band use this type of modulation. The proposed project requests that students perform a circuit simulation as well as an actual circuit implementation. Lic am modulators offer excellent frequency stability, linear amplituc.
Amplitude modulators highlevel modulation produces the best type of am, but it requires an extremely high power modulator circuit. The xr2206 is a monolithic function generator integrated circuit capable of producing high quality sine, square. The hchct4046a, pll with vco is a highspeed cmos ic designed for use in generalpurpose pll applications, including frequency modulation, demodulation, discrimination, synthesis, and multiplication. Fm circuit using xr2206 please help electronics forum. Monolithic function generator xr2206 xr2206 xr2206 monolithic function generator ttl xr2206 xr2206 1112eb low frequency square generator function generator function generator. The oscillator frequency can be linearly swept over a 2000. I tried a wall wart type power adapter and the waveform outputs were awful. I can only put it down to being a noisy and not smooth power. Implementation of fsk modulation and demodulation using.
Agure 153 am modulator using the xr2206 function generator 6. The circuit behavior is studied via both analysis using software tools and measurement using hardware. In the internet you can find a lot of circuits of am modulators, but i. This function generator is built around the xr 2206 monolithic function generator. Xr2206 function generator problems general information. Draw the waveform at pin 2 on figure 4 of the amplitudemodulated output.
Jul 16, 2008 is there a discrete, low distortion modulator circuit or ic that will do this. To study sampling and reconstruction of pulse amplitude modulation system 6. The 664 khz signal could be picked up on an am radio at the expected frequency, and the modulation heard. The xr2206 is a monolithic function generator integrated circuit capable of producing. The mc1496 has been characterized with a 60 mvrms sinewave carrier input signal. It was developed in the first few decades of the twentieth century. Notes two signal generators are used in this circuit, one representing a high frequency 200khz rf carrier, vg2, the other signal generator is used to inject a 1khz. The carrier frequency, fc, should be larger than the highest spectral component. Output of 1hz 2mhz xr2206 function generator can be connected directly to 60mhz counter for setting precise frequency output. Frequency modulation fm is the standard technique for highfidelity communications as is evident in the received signals of the fm band 88108 mhz vs.
In figure 2, the resistor r3 and r4 comprise a voltage divided circuit. And vco sine shaper 9 current switches 16 15 14 11 s mmet pi 25k setting 50 distortion swspsti out sync p2 500 setting 35 10 12 r3 5k am litude r2 5k 12. This is the same as the am modulation above but without the carrier. Peak value of carrier signal can also be computed using the peaktopeak value of the am waveform see fig. When you connect it up to power make sure the polarity is correct. The gain of entire circuit is determined by the r8 value. This laboratory exercise will use the xr2206 monolithic ic function generator. While this is the simplest technique available, it is nonlinear since a first order lowpass filter response falls as 1w and this results in second and thirdorder frequency components. Peak value of carrier signal can also be computed using the peaktopeak value of the am.
The modified am modulator circuit and the image of the circuit wired in the breadboard are shown below. In a radio transmission system there is a relation between the ranges of frequencies which can be transmitted wirelessly with the length of the transmitting antenna. Types of amplitude modulation am double sideband with carrier we will call it am. International journal of advance research in science and engineering. Amplitude modulation circuit implementation for use in a.
In the field of industrial control circuits, exar manufactures a. This level provides optimum carrier suppression at carrier frequencies in the vicinity of 500 khz, and is generally recommended for balanced modulator applications. The output waveforms can be both amplitude and frequency modulated. Frequency of operation can be selected externally over a range of 0. Linear integrated circuit lic function generators are ideally suited for communications and instrumentation applications requiring a low output power, amplitude modulated signal. The original method of electronically encoding sound information on radio waves is called amplitude modulation, or am. Based on my experience, the easy to build 1hzimhz xr2206 function generator kit allows a variety of routine measurements and experiments, and offers fairer quality sine, square, and triangle output waveforms with moderate stability and accuracy. The xr2206 is a monolithic function generator integrated circuit capable of producing high quality sine. After reading this you probably know why i am in love with the xr2206 in an alternatively designed device i could use am modulation with the same carrier frequency but a much wider modulation range 199% am modulation. Am modulator radio and electronic circuits, design.
The am wave is displayed along with the original modulating wave using a dual channel cro as shown in the following image. The circuit is ideally suited for communications, instrumentation, and function generator applications requiring sinusoidal tone, am, fm, or fsk generation. The xr2206 is a monolithic function generator integrated circuit capable of. Alternative integrated circuits are also available e. Figure 2 is the circuit diagram of the fsk modulator by using 2206 ic. Aug 16, 2020 the khz signal could be picked up on an am radio at the expected frequency, and the modulation heard. I simply put the end of the whip antenna of the small pocket radio near the output of the xr, and got plenty of signal.
This kit is designed using xr2206 ic to provide high stability and accuracy. A high quality function generator system using the xr2206. Connect vout of the circuit in figure 5 to pin 7 of the xr2206 with setup in iiih. Jan 16, 2021 the square wave signal will have signal strength is about 12 volts peak to peak, so if you want to use ttl circuits using voltage 5 volt. Dual xr2206 vco richard brewsters electronic sounds. Buy xr2206 xr, learn more about xr2206 monolithic function generator, view the manufacturer, and stock, and datasheet pdf for the xr2206 at jotrin electronics. Aug 19, 2016 sine wave generator project will provide you with a sinusoidal waveform output to test various instruments. Typical applications include suppressed carrier modulation, amplitude modulation, synchronous detection, fm or pm detection, broadband frequency doubling and. The output waveforms can be both amplitude and frequency modulated by an external voltage.
The xr2206 contains a voltage controlled oscillator vco whose. Here is the xr2206 circuit diagram, and the buffer circuit. Find am modulation xr2206 related suppliers, manufacturers, products and specifications on globalspec a trusted source of am modulation xr2206 information. Xr2206 ic is a waveform generator, which is similar to 8038 ic. The output waveforms can be both amplitude and frequency modulated by an. Also must add dc converter circuit with icsn74ls00. Due to our software license we must not allow to use the target 3001 file for commercial use. Am is a relatively simple way to add audio information to a carrier wave so that sounds can be transmitted. To study frequency modulation and determine its modulation factor 4. Diy am transmittercircuit diagram, components, description. All required circuit details are datazheet in the datasheet. The circuit of figure 1 shows an am modulator circuit, whose carrier and audio signals are singleended inputs, carrier to pin 10 and audio to pin 1.
Sine wave generator function generator xr2206 circuit. Home spice projects spice projects radio circuits modulators am modulator with xr2206 am modulator with xr2206 rated 5. Here is the xr2206 circuit diagram, and the buffer circuit diagram. Kkmoon xr2206 high precision function signal generator diy. Percentage modulation aka modulation index or modulation factor measure of extend to which carrier voltage is varied by intelligence defined as. The dc bias at this input is necessary, and the signal amplitude must be properly adjusted. Am modulator this circuit uses two signal generators to simulate an amplitude modulated rf carrier wave. Adjust the vr1 of am modulator to get maximum amplitude of am signal output.
The square wave signal will have signal strength is about 12 volts peak to peak, so if you want to use ttl circuits using voltage 5 volt. But this doesnt have the circuit i require for fm generation. Xr data sheet provides complete basic circuit for a simple function generator. Monolithic function generator, xr2206 datasheet, xr2206 circuit, xr2206 data sheet. Currently, it is more than adequate for a small home electronics hobby lab. Am fm generation vf conversion fsk generation phaselocked loops vco general description the xr2206 is a monolithic function generator integrated circuit capable of producing high quality sine, square, triangle, ramp, and pulse waveforms of highstability and accuracy. The schematic diagram for the linear integrated circuit am dsbfc modulator used in this section is shown in figure 153.
The output stage of the transmitter is a high power frequency class c amplifier. Thus, using the calculation above and the included trainer kit manual, the fundamental operating. Apr 29, 2020 home spice projects spice projects radio circuits modulators am modulator with xr2206 am modulator with xr2206 rated 5. Pdf xr2206 datasheet monolithic function generator. Here is the circuit diagram of a simple am transmitter circuit that can transmit your audio to your backyard.
It is an irreplaceable tool for troubleshooting and repairing electronic equipment by determining performance and health of electrolytic capacitors. Am modulation input controls sine and triangle only. The output can be used to simulate the response of lc and tank circuits. Xr2206 xr integrated circuits ics jotrin electronics. The lm1596lm1496 are doubled balanced modulator demodulators which produce an output voltage proportional to the product of an input signal voltage and a switching carrier signal. Pdf 4amplitude modulator and demodulator circuits appi t. One could make a small am radio transmitter with this chip for use over short distances. What i need exactly is a circuit with xr2206 for which when i apply a modulating signal, fm wave should be generated.
Am modulator with mc1496 project problem all about circuits. The main function of the voltage divided circuit is to let the negative voltage waveform of the 2206 ic operates normally. Am modulators base, collector, grid and plate modulators. Xr2206 datasheet monolithic function generator exar. Display the wave form from function generator xr2206 to labview using arduino uno. Connect the am signal output to the input ip of diode detector. Mar 04, 2021 the xr2206 is a monolithic function generator integrated circuit capable of producing high quality sine, square, triangle, ramp, and pulse waveforms of highstability and accuracy.
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