Interconnection structure for crosstalk reduction to improve off

Details Interconnection structure for crosstalk reduction to improve off Interconnection structure for crosstalk reduction to improve off

1993-08-31

1994-12-27

Pascal, Robert J.

Wave transmission lines and networks

Plural channel systems

With balanced circuits

333246, H01P 308

Patent

active

053769023

ABSTRACT:
To reduce crosstalk in reentrant off-chip RF selectivity, differential circuits (402, 415), transmission lines (423, 424), and off-chip filters (422) are used in a structure that balances the parasitic capacitances associated with all of the differential elements. The structure includes a substrate (409) with a differential generating circuit (402) and a receiving circuit (415). Two differential transmission lines (423, 424), each with constant characteristic impedance, and each with balanced capacitance to ground, both being closely spaced for some distance, couple the circuits (402, 415) to closely spaced terminating pads (403). A ground plane (412) is shared under both transmission lines (423, 424). A second substrate (408) having a reentrant RF path (406) with the first substrate (409) contains an RF function such as a filter or a delay line.

REFERENCES:
patent: 4350958 (1982-09-01), Pagnamenta
patent: 4386324 (1983-05-01), Schellenberg
patent: 4626889 (1986-12-01), Yamamoto et al.
patent: 4831497 (1989-05-01), Webster et al.
patent: 5027088 (1991-06-01), Shimizu et al.
patent: 5039824 (1991-08-01), Takashima et al.
patent: 5223741 (1993-06-01), Bechtel et al.
patent: 5223804 (1993-06-01), Usui

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