Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Reexamination Certificate
2005-11-08
2005-11-08
Cunningham, Terry D. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
C327S334000
Reexamination Certificate
active
06963238
ABSTRACT:
A high-precision and high-performance level shift circuit, which is not adversely influenced by an offset error owned by an operational amplifier. Two sets of resistors (4o) and (4p) having the same resistance values, which are connected between differential output terminals and an operational amplifier (4r) for performing a level shift control are provided. A feedback operation is carried out in such a manner that an average voltage of each of differential outputs (4i) and (4m) is continuously made coincident with a DC reference potential (4q) irrespective of an offset error of an output-purpose operational amplifier, and a level shift function having a small error is realized. Two resistors (4hand4l) are series-connected between a differential output of a digital/analog converter (4a) and a level shift circuit to output a voltage outside an output dynamic range of the digital/analog converter (4a).
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