Amplifiers – With periodic switching input-output
Reexamination Certificate
2007-12-18
2007-12-18
Choe, Henry (Department: 2817)
Amplifiers
With periodic switching input-output
C330S311000
Reexamination Certificate
active
11378906
ABSTRACT:
An amplifier circuit includes an input chopping circuit for chopping first and second input signals, a transconductance stage for amplifying an output of the chopping circuit and applying it to the input of a folded cascode stage, to the input of an un-chopping circuit, and to the input of a chopper-stabilized gain boost amplifier. The output of the un-chopping circuit drives sources of cascode transistors of the folded cascode stage. The gain boost amplifier includes another transconductance stage having another un-chopping circuit coupled to the gate of one of the cascode transistors of the folded cascode stage. The drains of cascode transistors of the folded cascode stage drive a class AB output stage. The amplifier provides both highly linear operation and low 1/f noise.
REFERENCES:
patent: 6002299 (1999-12-01), Thomsen
patent: 6307430 (2001-10-01), Thomsen et al.
patent: 6734723 (2004-05-01), Huijsing et al.
patent: 7209000 (2007-04-01), Huijsing et al.
patent: 7233198 (2007-06-01), Niederkorn
Brady III Wade J.
Choe Henry
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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