Patent ID: 7042381
Filing Date: 2006-05-09
Classification: H03M

Abstract:
1. An impedance ladder circuit, comprising: a series connection of n first resistors each having a resistance R, each adjacent pair of the first resistors defining an intermediate node there between, the series of n first resistors defining an output node at a first end and a termination node at a second end; n second resistors each having a resistance substantially equal to 2R, each second resistor coupled between a respective one of the intermediate nodes and a reference and between the termination node and the reference; a termination resistor substantially equal to 2R coupled between the termination node and the reference in parallel with one of the second resistors; and n capacitors, each coupled in parallel with a respective one of the first resistors; wherein each intermediate node and the termination node has a parasitic capacitance Cp, and wherein each of the n capacitors have a capacitance substantially equal to 2Cp.