Amplifiers – With semiconductor amplifying device – Including gain control means
Reexamination Certificate
2007-02-27
2007-02-27
Choe, Henry (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including gain control means
C330S254000
Reexamination Certificate
active
11108357
ABSTRACT:
A PGIA for use in measurement devices (e.g., data acquisition device) including a composite amplifier for level shifting and improved signal-to-noise ratio. The composite amplifier may level shift from a constant common mode voltage to a lower common mode voltage with a large voltage swing. The large output signal swing of the PGIA may allow excellent signal-to-noise ratio. Additionally, input op-amps of the PGIA may be bootstrapped so that their supply rails move according to an input signal of the PGIA. The PGIA may also include protection circuitry to protect components from damage, e.g., due to over-current conditions, and to keep all op-amps in proper closed loop operation. Furthermore, the PGIA may include DA compensation circuitry to cancel some dielectric absorptions effects and improve a step response of the PGIA and CMRR enhancement circuitry to increase symmetry at inputs of the PGIA and improve a CMRR associated with the PGIA.
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Daigle Clayton H.
Regier Christopher G.
Sjoboen Lauren
Wangsanata Antony
Choe Henry
Lewin Mario J.
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