Printed circuit assembly having integrated resistors for terminating data and control lines of a host-peripheral interface

Abstract

A printed circuit board assembly (PCBA) includes first and second integrated-circuit terminals and first and second connector terminals. A first transmission line transmits a data signal and a second transmission line transmits a clocking signal. The PCBA includes integrated circuitry comprising first and second pads, a first digital circuit for propagating the data signal through the first pad and a second digital circuit for propagating the clocking signal through the second pad. The first transmission line includes a first integrated-circuit conductive path including a first series-connected integrated circuit resistive element and a first printed-circuit conductive path. The second transmission line includes a second integrated-circuit conductive path including a second integrated-circuit resistive element and a second printed-circuit conductive path. The first resistive element has a first ohmic value, the second resistive element has a second ohmic value, the first printed circuit conductive path has a third ohmic value and the second printed circuit conductive path has a fourth ohmic value. The ratio of the third to the first ohmic value is such that the first ohmic value is in excess of an order of magnitude greater than the third ohmic value and the ratio of the fourth to the second ohmic value is 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 to the second ohmic value is substantially less than the ratio of the third ohmic value to the first ohmic value.