Threshold logic circuitry producing output on amplitude coincidence

Abstract

Abstract 1,028,650. Semi-conductor circuits. INTERNATIONAL BUSINESS MACHINES CORPORATION. Sept. 30, 1964 [Oct. 31, 1963], No. 39742/64. Heading H3T. [Also in Division G4] A threshold circuit for comparing an input voltage with a decreasing ramp voltage comprises a pair of diodes 16, 18, the junction 14 of which is at the lower voltage as shown in Fig. 2. When the ramp voltage becomes less than the input voltage a signal is passed via capacitor 62 to switch a tunnel diode and cause transistor 68 to give an output at 72. A number of threshold circuits 100, 102, 104 are arranged in Fig. 3 to indicate, by comparison with a ramp voltage from a common generator 106, which of a number of signals is the highest. The first circuit to respond sends a pulse to single-shot 110 to enable gates 112, 114, 116 passing the threshold circuit signal to a corresponding latch 118, 120, 122. The output from the latch activates an indicator 124, 126 or 128.

Inventors

• 👤 Ivars G Akmenkalns

Bibliographic Details