Patent ID: 7649394
Filing Date: 2010-01-19
Classification: H03K

Abstract:
1. A latch device for connection, in a comparator arrangement, to a comparator via capacitors between output terminals of the comparator and a first and a second input terminal of the latch device, comprising: a first input device in a first branch and a second input device in a second branch, wherein a first estimator unit adapted to generate a first estimate of a current generated by the first input device; a second estimator unit adapted to generate a second estimate of a current generated by the second input device; a control-voltage unit operatively connected to the first estimator unit and to the second estimator unit, wherein the control-voltage unit is adapted to generate a control voltage based on a sum of the first estimate and the second estimate; a first and a second voltage-controlled current unit adapted to generate currents at least based on the control voltage, wherein the first voltage-controlled current unit is operatively connected to the first branch and the second voltage-controlled current unit is operatively connected to the second branch; and an auto-zero unit adapted to supply a bias voltage to the input terminals of the latch device during an auto-zero phase.