Patent ID: 7961038
Filing Date: 2011-06-14
Classification: G05B

Abstract:
1. A digital proportional integral loop filter comprising: a first proportional amplification unit multiplying a phase error value by a first proportional loop gain; a first integral amplification unit multiplying a phase error accumulation value by a first integral loop gain; a second proportional amplification unit multiplying the phase error value by a second proportional loop gain; a second integral amplification unit multiplying the phase error accumulation value by a second integral loop gain; a first offset value generation unit generating a first offset value which is calculated by subtracting the second proportional loop gain from the first proportional loop gain and multiplying a resulting value by a phase error average value; and a second offset value generation unit generating a second offset value which is calculated by subtracting the second integral loop gain from the first integral loop gain and multiplying a resulting value by a phase error accumulation average value.