Patent ID: 6380875
Filing Date: 2002-04-30
Classification: H03B

Abstract:
A method of producing a curve in a digital ramp generator, the curve comprising,a rising ramp starting from a base power level dc and ending at a nominal power level A, the rising ramp being in the form (A-dc)&it;(sin&it;(Ï€&it;â€ƒ&it;t2&it;Tr))2+dc,â€ƒwhere Tr is the ramp time, a falling ramp starting from the nominal power level A and ending at the base level dc, the falling ramp being in the form (A-dc)&it;(cos&it;(Ï€&it;â€ƒ&it;t2&it;Tr))2+dc,â€ƒwhere Tr is the ramp time a flat portion between the rising ramp and the falling ramp at the nominal power level, characterized in steps of: using trigonometric identities the form of the rising ramp is transformed into form 12&it;((A+dc)+(A-dc)&it;cos&it;(Ï€&it;â€ƒ&it;tTr+Ï€)),using trigonometric identities the form of the falling ramp is transformed into form 12&it;((A+dc)+(A-dc)&it;cos&it;(Ï€&it;â€ƒ&it;tTr)),andproviding a digital sinusoidal oscillator for computing the cosine terms.