This scheme can be operated in both a voltagecontrolled. A novel resolvertodc converter based on otabased inversesine. Khaburi software based resolvertodigital converter for dspbased drives using an improved angletracking observer ieee trans. The principle of the resolver is depicted in figure 1a. Khaburi software based resolvertodigital converter for dsp. Ota1 and resistor r function as a triangulartosine waveform converter. Optimization of an ota based sine waveshaper open music labs. Kaewpoonsuk otabased sinetotriangular wave converter circuits syst. A small sine wave will also clip the same as a large sine wave so the amplitude of the sine wave doesnt matter as long as it is high enough for the amplifier to clip. The realization method exploits a hyperbolic tangent behavior of an ota to convert from a sine wave to a triangular wave. Is the fundemental frequency usually the greatest amplitude waveform of a complete waveform across 0 volts from positive to negative. The sinewave must first be converted into a square wave by amplifying it a lot and letting the amplifier clip the signal into squarewaves. Request pdf the experimental analyses and improvement discussion of a hydraulic sine wave generating device a new hydraulic sine wave generating device with amplitude modulation and frequency.
The experimental analyses and improvement discussion of a. Pdf generation of square and triangular wave with independently. The triangular and square wave waveform generators are key subparts of many analog and mixed. The proposed circuit employs operational transconductance amplifiers otas as. The external signal pin up sets the upper limit on the rising rate of the signal. A circuit of squaretriangular wave generator with all grounded passive. This portion of the vco is known as the exponential converter. A sinetotriangular wave converter based on operational transconductance amplifiers otas is proposed in this paper.
The converter linearly produces output signal proportional to the shaft angle in full range of 360deg. Eletter on systems, control, and signal processing issue 221, january, 2007 editor. Well so your saying that it is possible to convert from triangle wave to sinusoidal wave using the above mentioned procedure, once you have already calculated the fundemental frequency. Request pdf the experimental analyses and improvement discussion of a hydraulic sine wave generating device a new hydraulic sine wave generating. The output of the integrator is produces the triangle wave for the vco. Otabased sinetotriangular wave converter request pdf. In the first section, the demodulator makes use of the sampleandhold circuit shc to sample the peak amplitude of the resolver signal. The realization method exploits a hyperbolic tangent behavior of an ota to. Simple squarerooting circuit using otas request pdf. A sine to triangular wave converter based on operational transconductance amplifiers otas is proposed in this paper. A novel resolvertodc converter based on otabased inversesine function circuit. Request pdf simple squarerooting circuit using otas a method to implement a squarerooting circuit is described. This is due to the simplicity and accuracy of charge integration with a single capacitor. The proposed circuit provides a simple configuration and employs only otas as the active elements.
Noiserobust software based rd conversion methods using over sample technique jianming wang. This is a bistable oscillator circuit that changes between to states based on the input threshold. The ota2 is used as a feedback of the proposed circuit. Sine wave based vcos do exist, but are typically more complicated. Ota and cfoabased dutycycle tunable squaretriangular wave. Although dvccbased squaretriangular wave generator was discussed in a previous study. Generator based on schmitt trigger with ota and current controlled integrator using cccii. Abstracta highaccuracy resolvertolinear signal converter for the measurement of angular displacement is proposed in this paper. Secondly, ota works in nonlinear mode in this circuit. Pspice program using ad844 and lm700 circuit mo dels. Rate limiter dynamic is used to convert applied sine wave input into triangular wave output. Introduction the most common analog voltage controlled oscillator vco cores are sawtooth and triangle wave generators. Using two designed circuits connected with otabased sine to triangular wave converter and demodulator, a resolver to dc converter is proposed.
Therefore, the aim of this paper is to propose a sineto triangular waveform converter based on the use of otas. Otabased sinetotriangular wave converter springerlink. Optimization of an ota based sine waveshaper openmusiclabs february 2, 2017 i. A simple schmitt trigger circuit with grounded passive elements. The external signal pin lo sets the lower limit on the falling rate of the signal. A novel resolvertodc converter based on otabased inverse. The converter has been implemented on a dspace set and has been successfully tested both with a sensor emulator and a real halleffect sinusoidal encoder. In this paper, a triangulartosawtooth waveform converter and a control logic circuit have been described. The converter, based on a type ca3080 operational transconductance amplifier ota converts a triangular voltage into a sinusoidal one.
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