Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2006-08-22
2006-08-22
Choe, Henry (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S069000
Reexamination Certificate
active
07095280
ABSTRACT:
A PGIA for use in measurement devices (e.g., data acquisition device) having improved dielectric absorption (DA) compensation and common mode rejection ratio (CMRR). When a step function is applied to an input of the PGIA, a first and a second DA compensation circuit may generate DA compensation signals derived from the step function. The DA compensation signals may combine with an original response of the PGIA to cancel some of the dielectric absorptions effects and improve the overall step response of the PGIA. An input stage of the PGIA may include a CMRR enhancement circuit to increase symmetry at the inputs of the PGIA. The CMRR enhancement circuit may delay an input signal received at a negative input terminal a particular amount such that it is in phase with an input signal received at a positive input terminal of the PGIA, to improve the CMRR.
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Daigle Clayton H.
Regier Christopher G.
Sjoboen Lauren
Wangsanata Antony
Choe Henry
Hood Jeffrey C.
Lewin Mario J.
Meyertons Hood Kivlin Kowert & Goetzel P.C.
National Instruments Corporation
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