Amplifiers – Signal feedback – Variable impedance in feedback path varied by separate...
Reexamination Certificate
2006-09-20
2008-09-09
Choe, Henry K (Department: 2817)
Amplifiers
Signal feedback
Variable impedance in feedback path varied by separate...
C330S260000
Reexamination Certificate
active
07423482
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). The circuit amplification (Vout/Vin) may be changed by selectively connecting or disconnecting impedances (R1, . . . RN). Integration elements (INT1. . . INT N) connected upstream from each of the control inputs of transistors (S1, . . . SN) used for this purpose ensure a certain temporal smoothing of the curve of the circuit amplification (Vout/Vin) when connecting or disconnecting an impedance (R1, . . . RN). The integration element particularly ensures that even in the event of a sudden change of the affected activation signal (VD1, . . . VDN), the affected impedance (R1, . . . RN) is not also suddenly disconnected or connected.
REFERENCES:
patent: 3947806 (1976-03-01), Corkhill et al.
patent: 4079334 (1978-03-01), Hamilton
patent: 4399416 (1983-08-01), Gillespie
patent: 6933786 (2005-08-01), Mohandas et al.
patent: 7205845 (2007-04-01), Harms et al.
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, 1976, 1978, and 1980, pp. 93-108; English Summary included.
Choe Henry K
National Semiconductor Germany AG
Pearne & Gordon LLP
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