Amplifiers – With periodic switching input-output
Reexamination Certificate
2008-03-28
2009-11-24
Choe, Henry K (Department: 2817)
Amplifiers
With periodic switching input-output
C330S010000
Reexamination Certificate
active
07622988
ABSTRACT:
This disclosure describes a chopper stabilized instrumentation amplifier. The amplifier is configured to achieve stable measurements at low frequency with very low power consumption. The instrumentation amplifier uses a differential architecture and a mixer amplifier to substantially eliminate noise and offset from an output signal produced by the amplifier. Dynamic limitations, i.e., glitching, that result from chopper stabilization at low power are substantially eliminated through a combination of chopping at low impedance nodes within the mixer amplifier and feedback. The signal path of the amplifier operates as a continuous time system, providing minimal aliasing of noise or external signals entering the signal pathway at the chop frequency or its harmonics. The amplifier can be used in a low power system, such as an implantable medical device, to provide a stable, low-noise output signal.
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Denison Timothy J.
Santa Wesley A.
Choe Henry K
Medtronic Inc.
Shumaker & Sieffert P.A.
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