DAVID N PLOURDE
Funeral Home and Crematory in Dracut, MA
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Massachusetts 50388
Issued Date
Nov 10, 2008
Expiration Date
Jul 30, 2012
Type
Registered Unlicensed Funeral Director License
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Address
Dracut, MA 01826
Professional information
Apparatus And Method For Amplification With High Front-End Gain In The Presence Of Large Dc Offsets
US Patent:
2012018, Jul 26, 2012
Filed:
Jan 25, 2011
Appl. No.:
13/013666
Inventors:
Alasdair Gordon Alexander - Andover MA, US
David James Plourde - Dracut MA, US
Matthew Nathan Duff - Somerville MA, US
David James Plourde - Dracut MA, US
Matthew Nathan Duff - Somerville MA, US
Assignee:
ANALOG DEVICES, INC. - Norwood MA
International Classification:
H03F 3/45
US Classification:
330 69
Abstract:
Apparatus and methods reduce the likelihood of amplifier saturation due to propagated DC offsets, and reduce the recover from saturated stated when such saturation occurs. Advantageously, these attributes are beneficial for monitoring of bioelectric signals. A circuit uses an instrumentation amplifier connected as a high pass filter to attenuate large DC offsets and amplify small signals. The circuit can include an instrumentation amplifier electrically coupled with a first feedback circuit including at least one resistor and a second feedback circuit including an op-amp. The feedback circuit can also include a low-pass filter. The op-amp in the second feedback circuit can be configured as a non-inverting amplifier, an inverting amplifier, and/or an integrator circuit. Alternatively, the circuit can include an instrumentation amplifier with one feedback circuit including at least one resistor, and a coupling capacitor electrically coupled with a reference voltage.