Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – By integrating
Patent
1997-10-10
2000-05-09
Le, Dinh T.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
By integrating
327344, 327336, 327553, 327558, 327562, H03K 500
Patent
active
060609354
ABSTRACT:
A tunable integrator circuit having a main amplifier with an input resistor R and a feedback capacitor C and a tuning amplifier having a variable gain k between the output of the main amplifier and the feedback capacitor. The circuit has an effective capacitance of kC. Thus the integrator can be tuned to compensate for temperature and processing variations of the RC product by adjusting the gain of the tuning amplifier. The tuning amplifier can also be used to multiply the effective capacitance of the filter, kC, by increasing the gain k of the tuning amplifier beyond that needed to compensate for RC variations, thus reducing the area required for on-chip capacitances while maintaining a constant resistance. The circuit can be used independently or in conjunction with a capacitor array.
REFERENCES:
patent: 3831117 (1974-08-01), Fletcher et al.
patent: 5235223 (1993-08-01), Maple
Design of analog Filters, Passive, Active RC, and Switched Capacitor--Rolf Schaumann et al., (1990) pp. 222-229.
1977 IEEE International Solid-State Circuits Conference Digest of Technical Papers--Ian A. Young et al.--(Feb. 1977) pp. 156-157.
Design of a Low-Distortion 22-kHz Fifth-Order Bessell Filter-Un-Ku Moon et al.--vol. 28 No. 12 (Dec. 1993) pp. 1254-1263.
IEEE Transactions on Circuits and Systems, On the Stability of the Phase-Lead Integrator--Ken Martin et al.--(Jun. 1977)--vol. Cas-24, No. 6, pp. 321-324.
IEEE Transactions on Circuit Theory--vol. CT-16--(Aug. 1969) pp. 406-408.
Electronics Engineers' Handbook (Filters and Attenuators) pp. 12-42-12-57 (1989).
Le Dinh T.
Lucent Technologies - Inc.
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