Patent ID: 7282980
Filing Date: 2007-10-16
Classification: A61N,H03F

Abstract:
1. A voltage rectifying circuit comprising: a source signal input coupled to a first input of a polarity judgment circuit, to a first input of a first switch set and to a first input of a second switch set; a reference signal input coupled to a second input of the polarity judgment circuit, to a second input of the first switch set, to a second input of the second switch set and to a second non-inverting input of a DDA; the DDA having an output connected to a second inverting input of the DDA; the polarity judgment circuit having an output connected to the input of an inverter and to a control input of the first switch set; the inverter having an output connected to a control input of the second switch set; the first switch set having a first output connected to a first non-inverting input of the DDA; and a second output connected to a first inverting input of the DDA; and the second switch set having a first output connected to the first non-inverting input of the DDA, and a second output connected to the first inverting input of the DDA.