Transmission line used for internal circuit test point

Abstract

The invention discloses a transmitting line in the circuit testing point, which is characterized by the following: the transmitting line is set on the printing circuit board, which has at least one internal circuit testing point to provide circuit measurement; one first line segment with first line length and first line breadth is set at least one side of internal circuit testing point, which connects the transmitting line; the transmitting line lies on at least one second line segment with second line length and second line breadth to mate part of line segment of at least one side of internalcircuit testing point; the second line segment connects the internal circuit testing point and the first line segment. The invention utilizes resistance to mate optimum line length and line breadth,which makes partial line segment display high resistant property.

Description

technical field [0001] The invention relates to a transmission line, in particular to a transmission line for an internal circuit test point. Background technique [0002] In-Circuit Test (ICT) is a test operation applied in the manufacturing process of Printed Circuit Board (PCB), which uses a bed of needles-type in-circuit test equipment to contact the circuit nodes of the printed circuit board for measurement The performance or parameters of the component, regardless of whether there are other components connected to the component being measured. [0003] Check whether the component has the correct parameter value by measuring each component in sequence, such as resistance value, capacitance value, etc., as well as errors that occur in the manufacturing process of most printed circuit boards, such as open circuit, short circuit or component error Etc., even an integrated circuit (Integrated Circuit; IC) that fails due to electrostatic damage can also be detected by inter...

AI Technical Summary

Problems solved by technology

[0006] At present, it is not possible to reduce the impedance discontinuity caused by the internal circuit test point. Therefore, sometimes in order not to affect the signal integrity (Signal Integrity), the internal circuit test point on the transmission line must be removed. However, for the removed internal circuit Signal lines at test points cannot verify that there are no unexpected opens or shorts on the wires

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