Amplifiers – Signal feedback – Variable impedance in feedback path varied by separate...
Reexamination Certificate
2006-09-20
2008-05-06
Choe, Henry (Department: 2817)
Amplifiers
Signal feedback
Variable impedance in feedback path varied by separate...
C330S260000
Reexamination Certificate
active
07368987
ABSTRACT:
The present invention relates to a circuit configuration (10) having a feedback operational amplifier (AMP) for amplifying an input signal (Vin) input into the circuit arrangement (10) and outputting the amplified input signal as an output signal (Vout). In order to be able to change the circuit amplification (Vout/Vin) easily and reliably in the circuit configuration (10) and simultaneously keep an impairment of the output signal (Vout) caused by noise relatively low, capacitance values (Cb, C) of the coupling path (12) and of the feedback path (14) are adjusted simultaneously to one another correlated in a special way.
REFERENCES:
patent: 6288669 (2001-09-01), Gata
patent: 6768374 (2004-07-01), Lee
patent: 7002408 (2006-02-01), Roos et al.
patent: 7315199 (2008-01-01), Oishi
Paul Horowitz et al., “Feedback and Operational Amplifiers, Chapter 4”, The Art of Electronics, Second Edition, Cambridge University Press, 1980, 1989, pp. 175-195.
Ulrich Tietze et al., “6 Der Operationsverstärker”, Advanced Electronic Circuits, Springer-Verlag Berlin Heidelberg, 1969, 1971, 1974, 1978, and 1980, pp. 93-108; English Summary included.
Choe Henry
National Semiconductor Germany AG
Pearne & Gordon LLP
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