Amplifiers – With periodic switching input-output
Reexamination Certificate
2008-05-07
2010-06-08
Pascal, Robert (Department: 2817)
Amplifiers
With periodic switching input-output
C330S12400D
Reexamination Certificate
active
07733169
ABSTRACT:
An operational amplifier (1B) amplifies an input signal (Vin) to produce an output signal (Vout), and includes a 3-stage amplifier (1C) including a first amplifier stage (2) receiving the input signal, a second amplifier stage (3) driven by the first amplifier stage (2), and a third amplifier stage (4) driven by the second amplifier stage to produce the output signal. A slew detection current (Idetect) is generated when the input signal (Vin) exceeds a certain magnitude, and is converted to a control signal (41) that operates a switch (MN0) to short-circuit output conductors of the first amplifier stage to prevent signal charge from building up on capacitances associated with the output of the first amplifier stage during slewing. The three stage amplifier can be a chopper-stabilized, notch-filtered amplifier.
REFERENCES:
patent: 6933781 (2005-08-01), Jaussi et al.
patent: 7292095 (2007-11-01), Burt et al.
patent: 7403064 (2008-07-01), Chou et al.
patent: 7560991 (2009-07-01), Lin et al.
“A Micropower Chopper-Stabilized Operational Amplifier Using a SC Notch Filter With Synchronous Integration Inside the Continuous-Time Signal Path” by Rod Burt and Joy Zhang, IEEE Journal of Solid-State Circuits, vol. 41, No. 12, Dec. 2006, pp. 2729-2736.
Schaffer Viola
Zhang Joy Y.
Brady III Wade J.
Nguyen Khiem D
Pascal Robert
Patti John J.
Telecky , Jr. Frederick J.
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