Oscilloscope having an enhancement filter

Details Oscilloscope having an enhancement filter Oscilloscope having an enhancement filter

2007-04-17

2007-04-17

Hoff, Marc (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system

Measured signal processing

C702S189000, C702S194000, C702S197000

Reexamination Certificate

active

11097568

ABSTRACT:
An enhancement filter for an oscilloscope is disclosed wherein the enhancement filter may be initially calibrated for one or more channels and/or for one or more attenuation settings such as 50 mV per division, 100 mV per division, and/or 200 mV per division, for example. In one embodiment, a desired filter response is selected to have a modified Gaussian type filter function having an at least approximately linear phase response, wherein the transfer function of the desired filter response comprises a step response that is be stored in the oscilloscope to be used as a part of calibration system of the oscilloscope.

REFERENCES:
patent: 5978742 (1999-11-01), Pickerd
patent: 6111400 (2000-08-01), Foster et al.
patent: 6234658 (2001-05-01), Houldsworth
patent: 6459256 (2002-10-01), Pickerd
patent: 6473701 (2002-10-01), Tallman et al.
patent: 6542914 (2003-04-01), Pupalaikis
White Paper: “DSP in High Performance Oscilloscopes”, John J. Pickerd, Tektronix, Inc., Copyright 2004.
White Paper: “Advantages and Disadvantages of Using DSP Filtering on Oscilloscope Waveforms”, Agilent Technologies, Inc., Copyright 2004.

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