Ultra low distortion sine generator software

The sg505 ultralow distortion audio oscillator is designed to go with the aa501 thd analyzer. It generates low distortion sine and square wave signals from 20hz to 150khz in 46 steps. Follows the measurement of the victor ultra low distortion sine generator with olivine 2 unsing arta software, the result is very good 0. This circuit uses the versatile max038 function generator. Replacing m 1 in equation 1 gives the frequency resolution of the dds devices as 2 clock r n f f. With spurious distortion as low as 85 db at 100 khz signal frequency, a very flat amplitude spectrum and a rise time of 8 ns, the low distortion function generator.

The output system does, however a, have centertap which can be grounded if desired. Ultra low distortion audio oszillator the never ending search for a. I bought and assembled the ig18 kit before i got married. If after reducing the oscillator amplitude, disabling the meter, disabling the squarewave generator, improving the power supply, and lowering the distortion in the amplifier, the distortion reading is still too high you need to move the power transformer outside the case. In all of the output ranges, dramatic noise reduction has been realized, which makes this product perfect for a wide range of uses. Total harmonic distortion is the measurement of the harmonic distortion present in a signal and is the ratio of the sum of the powers of. Confirmed and checked with visual analyzer software and roland ua55 19624 usb audio interface. The output level can be specified anywhere from full scale to a single bit of amplitude. Ds360 ultra low distortion function generator twotone type sinesine, sinesquare sine frequency 0. Ultra low distortion audio oszillator the never ending. An ultra lowdistortion oscillator with thd below 140 db. This convenient handheld audio generator is perfect for field service of audio equipment and car stereo applications. Ultra low distortion audio oszillator the never ending search for a pure sine.

The performance of a low distortion analog source and the precision of direct digital synthesis dds is combined in a unique new instrument the ds360 from srs. Sue and i were married in june of 1971 so the unit is most likely 43 years old and possibly 44. A low distortion tuneable sine wave oscillator one can make a low distortion tuneable oscillator by incorporating an active filter inside an agc loop. An almost pure dds sine wave tone generator analog devices. Model ds360 ultra low distortion function generator. The twotone signal is defined as either two sine waves, or a sine wave and a square wave. Introduction the popular qrp labs vfosiggen kit is a controller for the si5351a synth module kit. Combining these results gives the frequency of the output sine wave fo. Distortion is kept at minimum level, especially at the audible frequency range. Both frequency and amplitude are independently set for the two waves. Since the generator output is fully isolated, the ground point of the load is immaterial. Audio precision system two 2322 oregon state university.

The computer executesspectralanalysis software and displays the resulting data. A low distortionoscillator drives the adc through an amplifier figure1. Low noise low distortion sine wave generator page 1. Pdf low cost ultrapure sine wave generation with self calibration. Set the sample rate in msps to what is appropriate for the adc. It features a variable output level control with a 0db20db attenuator switch. I have been setting up a low distortion sine wave generator based on this design. Test 18bit adcs with an ultrapure sinewave oscillator edn. With a handful of lowleakage passive components and two highimpedance op amps, you can build a sinesquarewave generator with output period of a. Its really hard to find an affordable signal generator to find with the specs. Rent stanford research systems ds360 ultralow distortion function generator call for availability. Ultra low distortion highlow frequency sine wave generator, low distortion. Low cost ultrapure sine wave generation with self calibration. One way to measure audio amplifier distortion is to use a lowdistortion source and then measure the distortion in the amplified result.

Thd measurement taken at 1khz, using a keithley 2015 thd meter with external ultra low distortion 0. Lowharmonic rf generator quality rf test equipment. This requires some sort of instrument to first measure the signal. The awg consists of dsp or waveform memory and dac, and the nonlinearity of the dac generates distortion components.

Square wave generation covers digital application in addition to the traditional analog using sine waves. How to make total harmonic distortion thd measurements. Similarly, the noise and distortion level of this ac generator should be much. Low noise, low distortion sine wave generator for testing adc demo boards demonstration circuit 1858a is a low noise, low distortion sine wave generator designed to be used in conjunction withlineartechnology 16bit and 18bit adc demoboards. Low distortion signal generator based on direct digital. The pictures are made with a 24bit adc pci soundcard and a program, which i wrote in labview. It delineates the roles of phase shift and gain in the circuit and then discusses considerations of the op amp. The oscillator has both sine and cosine outputs available, and if we square and add these voltages we in theory get a perfect constant voltage proportional to signal. Our model 4402b is a pure source rc oscillator with a distortion typically arrow keys. Wien bridge oscillator lt super low distortion variable.

The pscope software should recognize the adc demo board and configure itself automatically. A lowdistortion oscillator is necessary for testing todays adcs analogtodigital converters that. In addition to the sine wave the generator can be switched to pink noise. The audio precision system two aps2 can generate and analyze ultralow distortion, low fequency sinewaves 10hz200khz. Producing lowdistortion sine waves, this oscillator operates over the range 16 to 22000 hz.

Electrical engineering stack exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. I imagine the vendor could be happy to sell you one assembled and characterized for some price, they have clearly done so for. An sine oscillator good for distortion measurment of operational amplifiers and audio equipment. Available in an 8pin soic package, the mslosc sine source ic offers a low distortion of 0. It has rotary encoder tuning of the main clk0 output, and one fixed configurable output that. Simple generator provides verylowfrequencydistortion sine and square waves. Linsley hoods wienbridge oscillator with low harmonic distortion from may 1981 pp. Adc circuits that resolve signal into 20 or more bits need a lownoise signal source for measuring parameters such as harmonic distortion or effective number of bits. Low distortion function generator ds360 srs home page. Simple generator provides verylowfrequencydistortion.

This test requires a sinewave generator withresidual distortion. The circuit is based on two articles that have appeared earlier in wireless world roger rosens phase shifting oscillator, february 1982 pp. Dc1858a low noise, low distortion sine wave generator for. Generating low distortion sine waves is actually, down to about 80 db, not really a challenge.

A spectrum analyser display of the oscillator output at 600hz showing a thd of 0. Ultra low distortion audio oscillator the neverending search for a pure sine. This paper describes algorithms for generating a lowdistortion singletone signal, for testing adcs, using an arbitrary waveform generator awg. The sg6000f provides a pure, lowharmonic sinewave unlike most other compact signal generators. The ds360 combines outstanding frequency precision, ultra low distortion. More modern ultralow distortion opamps such as the lme or lm4562 could make some improvement even with no other changes. The operation of the digital portion of the aps2 is not discussed in. An ultra lowdistortion oscillator with thd below 140 db janascard. Rent or buy stanford research ds360 ultralow distortion. Other simpler wien bridge type circuits that i have seen use the same set up for changing the frequency.

We propose here to use dsp algorithms to precompensate for the distortion. I believe the tm5000 equivalent is the sg5010 and adds gpib control. Since the dac performance is not known, ill need to isolate the iv contribution to distortion, and thus need an ultralow distortion sine generator. Simple generator provides verylowfrequencydistortion sine and.

Ultra low distortion 0 00001 1khz sine generator assembled. Lowdistortion sinewave generation method using arbitrary. The stanford research systems srs ds360 ultralow distortion function generator offers the performance of a low distortion analog source combined with the precision of direct digital synthesis dds making it the ideal. The twotone signal is defined as either two sine waves or a sine and square wave. Truertas signal generator produces an ultra lowdistortion sine wave variable from 5 hz to 24khz. The users manual contains sample programs written in c, basic and. Ultra low distortion audio oscillator the neverending search for a pure sine ultra low harmonic distortion 10khz oscillator with 160dbc. The ds instruments sg6000f rf signal generator continues to set the industry standard in affordable ultracompact rf signal generation. Broadband noise for a 1 khz sine wave into a high impedance. Adc circuits that resolve signal into 20 or more bits need a low noise signal source for measuring parameters such as harmonic distortion or effective number of bits. A complete revision of the circuitry has realized the generation of lowdistortion sine waves with total harmonic.

Any impurity represents distortion, and that means added harmonics that make very low distortion measurements impossible. Low distortion function generator tiepie engineering. Hi, recently ive been working on the test setup for my 20bit audio adc im waiting for the chips to return back in 2 months. Looking for ultra low distortion 1khz sine generator page 1. Low distortion signal generator tektronix and keithley.

This project was published in the march 2010 issue of the australian magazine amateur radio, and uses a unique circuit and cheap readily available components to acheive laboratory grade performance. Williams, jim and guy hoover, test 18bit adcs with an ultrapure sinewave oscillator, edn. A ciphers by ritter page terry ritter 2005 november 14. Functionally, this board uses a wien bridge oscillator that. With a handful of low leakage passive components and two highimpedance op amps, you can build a sine squarewave generator with output period of a minute and more. Hf low distortion sinewave signal generator, 3 to 30mhz 1. The external synchronization signal input helps collaborate with other measurement devices. A do it yourself wien rc bridge sine generator with ultra low distortion in a range almost impossible to measure. Sinewave oscillator ron mancini and richard palmer hpl dallas abstract this note describes the operational amplifier opamp sinewave oscillator, together with the criteria for oscillation to occur using rc components. Hf low distortion sinewave signal generator, 3 to 30mhz. Although in this circuit some of the advanced characteristics of this ic are disabled, you can generate sine, triangle, square waves adjusting a0 and a1 pins see datasheet on. An ultra lowdistortion oscillator with thd below 140 db vojtech janasek. To power the victor 1khz board i have used a lm317lm337 module and a 18v018v rcore transformer.