Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Utilizing a three or more electrode solid-state device
Patent
1998-09-30
2000-07-11
Wells, Kenneth B.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Utilizing a three or more electrode solid-state device
327429, 327434, 257369, 257532, H01G 706
Patent
active
060878967
ABSTRACT:
Two FET transistors provide an electrical circuit characterized by a stable capacitance across a wide range of input voltages and temperture fluctuations. Additionally, the transistors provide a capacitive compensation circuit which stabilizes the output voltage of a band-gap reference circuit. The compensation circuit encompasses the electrical connecting of a PFET capacitor across the terminals of an NFET capacitor (preferably a low threshold voltage NFET), wherein the gate of the of the NFET capacitor is directly connected to an input lead, the substrate is grounded, and the source and drain are directly connected to a common output lead. The PFET is also directly connected to the the input lead and the output lead, however, instead of the substrate being grounded, the substrate of the PFET is electrically connected to the common output lead. This configuration results in a circuit which provides a steady capacitance across a wide range of voltages, and most importantly, during power-up of the reference circuit.
REFERENCES:
patent: 4937476 (1990-06-01), Bazes
patent: 5360989 (1994-11-01), Endo
patent: 5801411 (1998-09-01), Klughart
patent: 5801412 (1998-09-01), Tobita
patent: 5900766 (1999-05-01), Naffziger et al.
patent: 5920221 (1999-07-01), Shen et al.
Conexant Systems Inc.
Englund Terry L.
Wells Kenneth B.
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