Patent ID: 7058528
Filing Date: 2006-06-06
Classification: G06G,H01J

Abstract:
1. A method of controlling an asymmetric waveform generator, comprising: using a reference timer, providing a reference timer signal; using an asymmetric waveform generator, generating an asymmetric waveform as a combination of a first sinusoidal wave having a first frequency and a second sinusoidal wave having a second frequency approximately twice the first frequency; sampling the generated asymmetric waveform to obtain a set of data points that is indicative of the generated asymmetric waveform, a rate of the sampling being determined in dependence upon the reference timer signal, and each data point of the set of data points having a known relationship relative to the reference timer signal; analyzing the set of data points in terms of at least a first function relating to an ideal sinusoidal wave of the first frequency, to determine a first set of resultant values relating to the first sinusoidal wave; analyzing the set of data points in terms of at least a second function relating to an ideal sinusoidal wave of the second frequency, to determine a second set of resultant values relating to the second sinusoidal wave; and, in dependence upon the first set of resultant values and the second set of resultant values, providing a feedback signal for controlling the asymmetric waveform generator.