On-chip shielding coaxial conductors for mixed-signal IC

Details On-chip shielding coaxial conductors for mixed-signal IC On-chip shielding coaxial conductors for mixed-signal IC

1996-09-24

1998-09-22

Hardy, David B.

Active solid-state devices (e.g., transistors, solid-state diode

Combined with electrical contact or lead

Of specified configuration

257773, 257664, 257508, H01L 2941

Patent

active

058118829

ABSTRACT:
In an integrated circuit, capacitively coupled interference (digital-switching or analog cross-talk) is prevented by constructing shielded coaxial conductors for the analog signals. The coaxial configuration comprises a primary conductor for the analog signal surrounded by a secondary conductor that is electrically isolated from the primary one and that is connected to a clean power bus such as GND or Vdd. The outer secondary conductor shunts the digital noise energy to the power bus, preventing it from injecting noise into the analog primary conductor. A similar coaxial configuration is provided with a bootstrap follower to reduce the effects of parasitic capacitance for high-speed and small analog signals.

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