Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1996-04-26
1998-08-04
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, 330311, H03F 345
Patent
active
057899819
ABSTRACT:
A high-gain, low-power transconductance amplifier suitable for use in switched-capacitor circuits provides improved accuracy and high-speed operation. The transconductance amplifier includes an input circuit that receives an input voltage. A current mirror circuit is coupled to the input circuit. At least one active cascode circuit, coupled to the current mirror circuit, receives current from the current mirror circuit and provides an output current. The active cascode circuit provides gain enhancement to the transconductance amplifier by increasing the output impedance of the transconductance amplifier.
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Lloyd, J. et al., "A CMOS Op Amp with Fully-Different Gain-Enhancement", IEEE Transactions on Circuits and Systems-II, Vo. 41, No. 3, Mar. 1994, pp. 241-243.
Brooks Todd L.
Singer Lawrence
Analog Devices Inc.
Mullins James B.
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