Wide-bandwidth probe using pole-zero cancellation

US6483284B1 · kind B1 · utility

Assignee

• AGILENT TECHNOLOGIES, INC. · US

Inventors

• David Eskeldson · Colorado Springs, US
• Steven D. Draving · Colorado Springs, US
• Kenneth McClellan Rush · Colorado Springs, US

Key dates

• Filing date: Jun 20, 2001
• Grant date: Nov 19, 2002
• Expiry date: Jun 26, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R1/06766
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A probe apparatus for use with analyzing devices, primarily oscilloscopes and logic analyzers, which uses pole-zero cancellation to provide a probe with low capacitance and wide bandwidth. Pole-zero cancellation enables the probe to have constant gain at all frequencies. In one embodiment, the coaxial cable between the probe tip and the replication amplifier is terminated in its characteristic impedance to provide constant gain at all frequencies regardless of cable length. Use of pole-zero cancellation and thick film technology enables building a probe with a small, durable tip.