3 results about "Allan variance" patented technology

The Allan variance (AVAR), also known as two-sample variance, is a measure of frequency stability in clocks, oscillators and amplifiers, named after David W. Allan and expressed mathematically as σy²(τ). The Allan deviation (ADEV), also known as sigma-tau, is the square root of the Allan variance, σy(τ). The M-sample variance is a measure of frequency stability using M samples, time T between measures and observation time τ.