Long time constant integrating circuit

Details Long time constant integrating circuit Long time constant integrating circuit

G - Physics

06

G

354/153

G06G 7/186 (2006.01)

Patent

CA 1287176

R4396.01 EAO: kaf LONG TIME CONSTANT INTEGRATING CIRCUIT ABSTRACT A method and apparatus for performing integration using a circuit capable of integrating an input signal over a wide linear dynamic range. The circuit modulates the input signal with a biphase signal having positive and negative phases. The modulated signal is then provided to an integrator. The integrator operates continuously within its linear range without needing charge dumping because the amplitude of the modulated signal is less than the amplitude required to saturate the integrator. Each interval of the integrated signal corresponding to positive and negative phases of the biphase signal is then partitioned into intervals corresponding to the positive phases and intervals corresponding to the negative phases by two track and hold circuits with alternating tracking and holding periods. The signal intervals corresponding to the negative phase of the biphase signal are subtracted from the intervals corresponding to the postive phases by a differential amplifier. These subtracted intervals are then added together by a sample and hold circuit joined with a -1- summing circuit to produce the integrated signal corresponding to the linear integration of the input signal. The circuit is thus the mathematical equivalent of dividing the desired period of integration into a finite number of intervals, integrating each interval over that subdivided portion of the desired integration period, then adding the integrals of the intervals which equals the integral over the desired integration period. The frequency of the biphase signal can be adjusted so that integration of the subdivided portions of the desired period of integration requires capacitors sizes capable of being incorporated onto an integrated circuit.

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