Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By phase
Patent
1992-10-28
1994-12-27
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By phase
327156, 327337, H01D 302
Patent
active
053768914
ABSTRACT:
A circuit combining the functions of phase-sensitive rectifier and integrator uses an operational amplifier and capacitors. A control signal switches a capacitor in and out of a feedback loop containing a second feedback capacitor, resulting in a residual charge in the second feedback capacitor if there is a phase-difference between an input signal and the control signal. The invention may also incorporate an automatic offset compensation circuit by using additional switches and a second control signal. The capacitor that is switched in and out of the feedback loop is coupled to a compensation capacitor during periods when the capacitor is not being used for the phase-sensitive rectifier and integrator portions of the circuit. The circuit arrangement allows the use of long time constants in the integrator portion of the circuit.
REFERENCES:
patent: 4543534 (1985-09-01), Temes et al.
patent: 4543546 (1985-09-01), Hariharan
patent: 4894620 (1990-01-01), Nagaraj
Viswanathan et al., "Increasing The Clock Frequency of Switched Capicitor Filters", Electronic Letters, Apr. 1980, vol. 16, No. 9, pp. 316-317.
Tietze and Schenk, Halbleiter-Schaltungstechnik, 6th ed., Springer-Verlag, pp. 308-310, 1983.
Allen and Sanchez-Sinencio, Switched Capacitor Circuits, Van Nostrand Reinhold Company, New York, pp. 546-547, 1984.
Tietze and Schenk, Halbleiter-Schaltungstechnik, 5th ed., Springer-Verlag, Berlin, pp. 683-687, 1980.
Meade, "Advances in Lock-In Amplifiers," J. Phys. E: Sci. Instrum. 15: 395-402, 1982.
Martin et al., "Switched Capacitor Building Blocks for Adaptive Systems," 1981 IEEE International Symposium on Circuits and Systems Proceedings, Chicago, Ill., vol. 2, pp. 517-518, 1981.
Callahan Timothy P.
Lam T. T.
SGS-Thomson Microelectronics GmbH
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