DE1010568B - Pulse anti-coincidence circuit - Google Patents

Description

GERMAN

The invention relates to electric gate circuits, i. H. electrical circuits that produce signals depending on the prevailing to let through or not to let through external conditions or at predetermined times and each contain one output circuit and two or more input circuits.

An anti-coincidence circuit is to be understood as a circuit with several input circuits for Signal pulses (coincidence input circuits) and an input circuit for blocking pulses (anti-coincidence input circuit), which are arranged in such a way that they are applied to the coincidence input circuits and coincide in time Pulses each generate an output pulse in the output circuit, whereas no output pulse is generated in the output circuit if at the same time a blocking pulse is sent to the anticoincidence input circuit is placed.

In the previously known anti-coincidence circuits, a negative blocking pulse in the anti-coincidence input circuit was required to suppress an output pulse in coincidence input circuits responding to positive pulses, or vice versa. Since it is easier to give pulses of the same polarity to both the coincidence ^{and the anticoincidence input circuits, an anticoincidence circuit whose 1} coincidence input circuit responds to positive pulses and whose anticoincidence input circuit responds to negative pulses. B. be reversed by means of an amplifier tube so that pulses of the same polarity could be applied to all input circuits.

The invention relates to an anti-coincidence circuit which responds to pulses of the same polarity.

Accordingly, the invention is based on an anti-coincidence circuit, consisting of a number of electronic devices with multiple signal input circuits and an anti-coincidence input circuit in which, upon receipt, the signal input circuits are sent simultaneously applied signals an output pulse is generated, unless a blocking pulse is applied at the same time applied to the: anticoincidence input circuit, and it is characterized in that two Electronic devices are provided which can assume two stable working states and have a common input circle and each have their own input circle, one of which an output pulse is generated when pulses are sent simultaneously to the common and their own input circuit and that in each electronic device's own input circuit Means are switched on so that a time coincidence at the input circuits of both elek-pulse -Antico incidence circuit

Applicant:

The National Cash Register Company,
Dayton, Ohio (V. St. A.)

ίο Representative: Dr. A. Stappert, lawyer,

Düsseldorf, Benrather Str. 12-14

Claimed priority:
Great Britain July 28, 1953 and March 9, 1954

ironic devices of applied input pulses cause the other device to assume a state which prevents the first device from responding and thereby prevents an output pulse from being emitted suppressed.

One described in a preferred embodiment of the invention, controlled by positive pulses Anti-coincidence circuit contains two electronic devices with two stable working states and one common to both devices and one associated with each device Input circle. The arrangement is such that when positive pulses are applied simultaneously every three input circuits a device assumes a state that the other device responds and consequently preventing output pulses from said other device.

The subject matter of the invention is particularly applicable to electronic numeric computing circuits. In an embodiment to be described in connection with this field of application contains the Anticoincidence circuit two cold cathode gas discharge tubes with one common and one each own input circle. Each separate input circuit contains impedance elements in such a ratio stand to each other that when simultaneously applying positive pulses to all input circuits one Tube becomes conductive and thereby a conduction in the other tube is prevented.

An embodiment of the invention will now be explained using the circuit diagram.

709 549Ί50

The two electron tubes 1 and 2 shown in the circuit diagram are preferably cold cathode gas discharge tubes and each have an anode, a cathode and an ignition electrode. The anodes of tubes 1 and 2 are connected via a common anode resistor 3 to a positive pole 4 of a voltage source for anode voltage F ₁ and via a capacitor 5 to a pulse source A , from which positive pulses F _{2 are} emitted. The cathodes of the tubes 1 and 2 are connected to a negative pole 6, which is preferably grounded. A resistor 7 is connected in the cathode circuit of the tube 1. The output circuit of the tube 1 containing a capacitor 8 is connected between the resistor 7 and the cathode of the tube 1 to the cathode circuit. The anode-cathode voltage of tubes 1 and 2 is lower than the voltage causing the discharge of tubes 1 and 2.

The ignition electrode of the tube 1 is connected via a resistor 9 and a capacitor 10 to a pulse source B which _{emits positive pulses F 3.} The ignition electrode of the tube 2 is connected via a resistor 11 and a capacitor 12 to a pulse source C which _{emits positive blocking pulses F 4.} The ignition electrodes of tubes 1 and 2 are also connected to a voltage source carrying positive bias voltage V _{5 via resistors 13 and 14, respectively.} However, this bias is such that neither of the two tubes can ignite.

Thus, the anti-coincidence circuit is equipped with three input circuits, one of which is the Input circuit for the blocking pulse is, and is connected so that an output voltage across the resistor 7 only occurs if pulses occur simultaneously on two specific input circuits, but that an output pulse is prevented if a given to the anticoincidence input circuit, positive pulse with positive pulses applied to the inputs of the two coincidence input circuits coincides exactly in time.

The operation of the anti-coincidence circuit is as follows: Depending on the anode voltage of the tubes and because of the lack of ignition conditions in these tubes, the application of only pulses V ₂ to the anodes, which are derived from the pulse source A , is insufficient to close one of the two tubes ignite!. However, the bias voltage on the ignition electrodes is such that the application of positive pulses V ₃ to the ignition electrode of tube 1 or of positive blocking pulses V ₁ to the ignition electrode of tube 2 is sufficient to cause an auxiliary discharge in tube 1 or in tube 2 To set a gear, which, however, stops when the impulse is terminated.

If a pulse F _{2 occurs} simultaneously with a pulse F ₃ , the auxiliary discharge in the tube 1 will coincide with the rise in the anode voltage of this tube, and the tube 1 will ignite. The resulting increase in the cathode voltage is emitted as a positive pulse V ₆ via the capacitor 8.

The resistances 9 and 11 in the circles of the ignition electrodes of the tubes 1 and 2 are dimensioned so that the value of the resistor 11 is smaller than the value of the resistor 9, whereby the ignition point of the tube 2 is lower than that of the tube 1. If all three input circuits are at the same time positive pulses F ₂ , F ₃ or F _{4 are} supplied, the anode voltage of both tubes will rise at the same time, and thus both tubes will be able to ignite. However, since the ignition delay in tube 2 is less than that in tube 1, only tube 2 will ignite and thus the anode voltage of both tubes will be reduced by an amount which corresponds to the anode voltage drop across resistor 3, i.e. below an amount at which the tube 1 ignites. Thus, the presence of a blocking pulse F ₄ from the pulse source C prevents the tube 1 from igniting, so that no pulse is generated in the output circuit of the tube 1.

In a typical embodiment in which the resistor 11 is 0.1 megohms and the resistor 9 Is megohms, the ignition delay of the tube 2 is approximately 5 microseconds and that of Tube 1 about 20 microseconds.

Although in the described anti-coincidence circuit electronic discharge tubes, e.g. B. cathode gas discharge tubes, can of course also be used with gastriodes, gastetrodes or semiconductor arrangements such as transistors, Find use ·. Wherever electronic tubes are used, these can be grids or others Auxiliary electrode !! contain.

Claims (3)

Patent claims: 1. Anticoincidence circuit, consisting of a number of electronic devices with several signal input circuits and an anticoincidence input circuit, in which an output pulse is generated when receiving signals applied simultaneously to the signal input circuits, unless a blocking pulse is applied simultaneously to the anticoincidence input circuit, characterized in that two Electronic devices (1, 2) are provided, each of which can assume two stable working states and has a common input circuit (F ₂ ) as well as its own input circuit (F ₃ , F ₄ ) and of which one (1) has an output pulse (F ₆ ) generated when pulses are applied simultaneously to the common (F ₂ ) and its own (F ₃ ) input circuit, and that means (9, 11) are so switched on in the own input circuits (F ₃ , F _{4) of each electronic device} that a temporal coincidence at these input circuits of both electronic devices (1 , 2) applied input pulses (F ₂ , F ₃ , F ₄ ) causes the other device (2) to adopt a state that prevents the first device (1) from responding and thereby suppresses the emission of an output pulse. 2. Anticoincidence circuit according to claim 1, characterized in that an electronic input discharge _{tube (2) and an electronic output discharge tube (1) each with a common pulse source (F 2} ) connected and fed via a common resistor anode, one cathode and one each Ignition electrode connected to its own pulse source (F ₃ , F ₄ ) are provided, the circuits of the ignition electrodes each contain an impedance element (9, 11), the values of which are such that the ignition delay of the input tube (2) is less than that of the output tube (1), and that means (A, B, C) are available via which pulses of the same polarity are applied simultaneously to the anodes and ignition electrodes of both tubes (1, 2), which causes the input tube (2) conductive, thereby conducting the output tube (1) and generating pulses is prevented in the output circuit. 3. Anticoincidence circuit according to claim 2, characterized in that pulses of the same polarity, which are applied simultaneously to the input circuit (V ₂ ) and to the ignition electrode of the tube (1), the working state of the tube (1) change so that a pulse is _{generated in the output circuit (F 6} ). Considered publications:
"Waveforms", 1949, pp. 381 to 384 (Mc. Graw Hill Book Comp.); "Review of Scientific Instruments", August 1947, Pp. 551 to 556. 1 sheet of drawings