Improvements in or relating to electrical circuit arrangements for effecting integration and applications thereof

Abstract

Abstract 580,527. Thermionic valve circuits. BLUMLEIN, D. (Representative of BLUMLEIN, A. D.). June 5, 1942, No. 7712. [Class 40 (v)] Voltages are integrated in a circuit comprising in series the source to be integrated, a first impedance, a capacity and a second impedance with the input and output circuits of a valve associated with the impedances and the condenser providing negative feedback. Fig. 2 shows impedances 1, 3 and a valve 4 with the condenser 2 providing feedback. If, as shown, the source is constant the voltage developed in the output circuit will vary linearly with time. Fig. 4 shows an arrangement with a further source of voltage and a further impeddance which constitute with the capacity 2 and impedance 3 a second integrating circuit so that the output represents the sum of the time integrals. The further impedance is constituted by the anode /cathode path of the valve 12 and voltage is applied through anode 13 to render the valve non-conducting. A sawtooth waveform may be generated by periodically returning the integrated voltage to some predetermined value. Fig. 2 shows a pentode with the screen and suppressor grids fed by a potentiometer 7, 8, 9 and a diode 11 arranged to limit the potential of the anode of the valve 4 associated with the network 1, 2, 3. In this arrangement when the anode voltage falls to a value such that the operating point is on the knee of the characteristic screen current increases due to transitron action thus cutting off the anode current and reducing the screen voltage and increasing the anode voltage. Pulses delayed by a controllable time may be generated from applied pulses by arranging that a pulse is generated when the anode of the valve 4 falls to a predetermined value. With a plurality of integrating circuits a time delay inversely proportional to the sum of the applied voltages may be obtained. The delayed pulse may be generated by causing the anode voltage of the valve 4 to trigger a multivibrator. Reference has been directed by the Comptroller to Specification 575,250.

Inventors

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