Amplifiers – Sum and difference amplifiers
Reexamination Certificate
2006-11-15
2008-08-19
Choe, Henry K (Department: 2817)
Amplifiers
Sum and difference amplifiers
C330S260000
Reexamination Certificate
active
07414467
ABSTRACT:
The present invention relates to a circuit configuration having a feedback operational amplifier (AMP), which is implemented as fully differential, for amplifying an input signal differentially input to the circuit configuration and for outputting the amplified input signal as a differential output signal. In order to increase the freedom in setting the input common mode voltage, according to the present invention, a combination made of a coupling resistor (R1b) and a level shifter (I1b, Nsfb) connecting the positive amplifier output (y1) to the inverting amplifier input (x2) and a combination made of a coupling resistor (R1a) and a level shifter (I1a, Nsfa) connecting the negative amplifier output (y2) to the noninverting amplifier input (x1) are provided.
REFERENCES:
patent: 5382919 (1995-01-01), Lawton
patent: 6304144 (2001-10-01), Yamazaki et al.
patent: 6545534 (2003-04-01), Mehr
patent: 6621337 (2003-09-01), Gropl
patent: 6940348 (2005-09-01), Confalonieri et al.
patent: 43 36 668 (1994-05-01), None
Choe Henry K
National Semiconductor Germany AG
Pearne & Gordon LLP
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