Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1996-07-11
1998-08-25
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327543, 323313, 323315, G05F 110
Patent
active
057986690
ABSTRACT:
An integrated voltage/current reference having substantially reduced temperature and voltage coefficient with simultaneous nanowatt power consumption includes a nanopower voltage/current reference topology having a substantial temperature coefficient and minimal voltage coefficient and augmented with a floating voltage proportional to absolute temperature (PTAT) within a feedback loop to compensate for differentials in .beta. exponential temperature dependencies of N-Channel and P-Channel MOS devices used within commonly available semiconductor processes. The resulting reference supplies both voltage as well as current references which have greatly reduced temperature coefficients. In addition, the resulting circuit topology generates a voltage reference which has a parabolic temperature coefficient similar to that produced by a conventional bandgap reference. The turnover temperature, or point of zero temperature coefficient, with this new circuit topology can be made to coincide with the turnover temperature of the crystal resonator used within conventional watch crystal oscillator circuits, making this new topology preferable over existing voltage/current reference circuit topologies.
REFERENCES:
patent: 5512816 (1996-04-01), Lambert
patent: 5594382 (1997-01-01), Kato et al.
Eric A. Vittoz et al., A Low-Voltage CMOS Bandgap Reference, IEEE Journal of Solid-State Circuits, vol. SC-14, No. 3, Jun. 1979 pp. 573-577.
Willy M. Sansen et al., A CMOS Temperature-Compensated Current Reference, IEEE Journal of Solid-State Circuits, vol. 23, No. 3, Jun. 1988, pp. 821-824.
Eric Vittoz et al., CMOS Analog Integrated Circuits Based on Weak Inversion Operation, IEEE Journal of Solid State Circuits, vol. SC-12, No. 3, Jun. 1977, pp. 224-231.
C. Toumazou et al., Analogue IC Design: The Current-Mode Approach, Analog Interface Circuits for VLSI, pp. 480-489.
Callahan Timothy P.
Dallas Semiconductor Corp.
Kim Jung Ho
LandOfFree
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