Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Reexamination Certificate
2006-05-23
2006-05-23
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
C327S334000, C330S258000
Reexamination Certificate
active
07049875
ABSTRACT:
Methods and apparatus for automatic tuning of MOSFET resistors providing accuracy and linearity throughout process and temperature variations. In accordance with the methods, the source and drain of a MOSFET device are biased in a balanced manner around a common mode voltage using a circuit controlling the gate voltage of the MOSFET to set the current through the MOSFET responsive to the value of a resistor. Operating MOSFETs, such as in MOSFET-C filters, with the same device conductivity type, gate bias, substrate voltage and signal common mode voltage provides linear MOSFET resistors, accurately set by a single resistance value. Use of an external resistor provides a single pin setting of MOSFET resistances, that may be independent of temperature and process variations. Various embodiments are disclosed.
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Almo Khareem E.
Blakely , Sokoloff, Taylor & Zafman LLP
Theta Microelectronics, Inc.
Wells Kenneth B.
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