Patent ID: 6480020
Filing Date: 2002-11-12
Classification: H05K

Abstract:
A printed circuit board assembly that is plug compatible with a host-peripheral interface via which digital data are synchronously transmitted at a data rate via conductive paths that exhibit transmission-line characteristics at the data rate, the printed circuit board assembly comprising:a first integrated-circuit terminal and a first connector terminal; a first transmission line for transmission of a data signal; a second integrated-circuit terminal and a second connector terminal; a second transmission line for transmission of a clocking signal; integrated circuitry including: a first pad and a second pad; a first digital circuit for propagating the data signal through the first pad; a second digital circuit for propagating the clocking signal through the second pad; the first transmission line including: a first integrated-circuit conductive path including a first integrated-circuit resistive element connected in series between the first pad and the first digital circuit; and a first printed-circuit conductive path; the second transmission line including: a second integrated-circuit conductive path including a second integrated-circuit resistive element; and a second printed-circuit conductive path; the first integrated-circuit element having a first ohmic value; the second integrated-circuit element having a second ohmic value; the first printed circuit conductive path having a third ohmic value, the ratio of the third ohmic value to the first ohmic value being such that the first ohmic value is in excess of an order of magnitude greater than the third ohmic value; the second printed circuit conductive path having a fourth ohmic value, the ratio of the fourth ohmic value to the second ohmic value being such that the second ohmic value is in excess of an order of magnitude greater than the fourth ohmic value; the ratio of the first ohmic value to the second ohmic value being substantially less than the ratio of the third ohmic value to the first ohmic value.