| US 7,550,962 B2 | ||
| Wide bandwidth attenuator input circuit for a measurement probe | ||
| Ira G. Pollock, Hillsboro, Oreg. (US); Paul G. Chastain, Portland, Oreg. (US); and William Q. Law, Beaverton, Oreg. (US) | ||
| Assigned to Tektronix, Inc., Beaverton, Oreg. (US) | ||
| Filed on Mar. 29, 2007, as Appl. No. 11/693,631. | ||
| Application 11/693631 is a division of application No. 11/123752, filed on May 06, 2005, granted, now 7,256,575. | ||
| Claims priority of provisional application 60/575980, filed on Jun. 01, 2004. | ||
| Prior Publication US 2007/0164731 A1, Jul. 19, 2007 | ||
| Int. Cl. G01R 1/20 (2006.01) | ||
| U.S. Cl. 324—126 [324/72.5] | 5 Claims |
| 1. A wideband input attenuation circuit for an active voltage measurement probe receiving an input signal from a device under
test comprising:
a compensated RC attenuator having a first resistive element coupled in parallel with a first capacitive element that are
coupled in series with a second resistive element coupled in parallel with a second capacitive element;
a Z0 attenuator having a first resistive element coupled in series with a second resistive element, the first resistive element
of the Z0 attenuator being coupled to the first resistive element coupled in parallel with the first capacitive element of the compensated
RC attenuator and the second resistive element of the Z0 attenuator being coupled to the second resistive element coupled in parallel with the second capacitive element of the compensated
RC attenuator;
a transmission line coupling the first resistive element coupled in parallel with the first capacitive element of the compensated
RC attenuator to the second resistive element of the Z0 attenuator; and
a buffer amplifier coupled to the junction of the transmission line with the second resistive element of the Z0 attenuator.
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