Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1996-04-04
1997-12-16
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330256, 330261, 128696, H03F 345
Patent
active
056990146
ABSTRACT:
A low-noise, low-power complementary metal-oxide-semiconductor (CMOS) integrated circuit common source differential amplifier is disclosed which is capable of amplifying low amplitude cardiac signals such as those produced by atrial depolarization of the heart. The amplifier has a pair of large area p-channel input field-effect transistors (FETs) biased in weak inversion. The amplifier also has active load FETs biased in the nonsaturation (linear) region by means of a varying gate terminal voltage applied by a dynamic bias circuit. The gate terminal voltage is varied to match the temperature dependence of the output conductance of the load FETs to the temperature dependence of the transconductance of the input FETs. The gate terminal voltage also sets a dc bias point which uses the nonlinearity in the load FET output conductance to cancel nonlinearity in the input FET transconductance.
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Haefner Paul A.
Linder William J.
Cardiac Pacemakers Inc.
Mottola Steven
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