Wave transmission lines and networks – Attenuators
Reexamination Certificate
2008-03-17
2009-12-01
Jones, Stephen E (Department: 2817)
Wave transmission lines and networks
Attenuators
Reexamination Certificate
active
07626474
ABSTRACT:
An attenuator circuit. The attenuator circuit includes a resistive divider coupled to a capacitive network including first and second capacitive dividers. The resistive divider is configured to perform an N:1 attenuation of a signal in a low frequency range. The first and second capacitive dividers are configured to perform an N:1 attenuation in the high frequency range that is a product of the attenuation provided by each (e.g., each performing an M:1 attenuation, where N=M×M, with the total attenuation of the capacitive dividers being N:1 where N=M×M). A variable capacitance divider is coupled in parallel with the second capacitive divider, and includes first and second variable capacitors that, when adjusted, change the high frequency attenuation of the attenuator circuit to match the value of the high frequency attenuation to that of the low frequency attenuation.
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Mullen Eric M.
Whittington Mark
Heter Erik A.
Hood Jeffrey C.
Jones Stephen E
Meyertons Hood Kivlin Kowert & Goetzel P.C.
National Instruments Corporation
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