Biphase sinusoidal oscillator based on negative resistor.

This paper describes a biphase sinusoidal generator which provides two signals: v(ref)=V(M) sin(omegat) and v(out)=V(M) sin(omegat+DeltaPhi), where DeltaPhi is in the range 0, pi/2 or -pi/2, 0 and is not dependent on the frequency value. It is based on a negative resistor and it requires very few components. SPICE simulations and measurements on an experimental setup confirm the theoretical analysis.

Total harmonic distortion of a pseudosinusoidal signal of an arbitrary wave form generator.

In its simplest shape, the pseudosinusoidal signal given by an arbitrary wave form generator is constituted by a continuation of samples which involve the presence of parasitic harmonics and an increase in its total harmonic distortion (THD) value. It seems evident that the signal shape can be improved by using a linear interpolation between two consecutive samples but, to our knowledge, this improvement is not evaluated quantitatively to date. So, we propose to calculate this THD (according to the number of samples used to build the signal) with or without linear interpolation.

Proposition to build a digitally controlled biphase sinusoidal generator.

We propose a new method to build a biphase sinusoidal generator which provides two signals: v(1)=V(m) sin (omegat) and v(2)=V(m) sin (omegat+phi), where V(m), omega, and phi are digitally controlled. Measurements on a prototype confirm the analytical calculations. The article relates especially to the phase control.