SU907805A1 - And-or-and/and-or-and-not element - Google Patents

Description

(5) THE LOGICAL ELEMENT OF AND-OR-AND / TH-TH-OR-TH

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The invention relates to pulsed and digital devices, in particular, to the logical elements of the CM.

The AND-OR / AND-OR-NOT logic element is known, which contains a current generator, lower and upper stage current switches; input emitter-type emitter switches are used at the input of the lower stage current switch; Whether the inverse collector output of the lower stage current switch is connected to the common emitter point of the current switch of the upper stage 1j.

The disadvantage of the device is the presence of two reference transistors and two reference voltages, a significant amount of supply voltage, high power consumption and relatively low speed.

Also known is a logic element containing input elements built on transistors of the first conductivity type, whose collectors are connected to a common bus, emitters are connected via resistors to the power bus and transistor bases of the second conductivity type, the emitters of which are connected to a common bus 2 through a resistor.

The disadvantages of the known element are narrow functionality due to the difficulty of implementing inversion operations and low room resistance.

The purpose of the invention is to enhance the functionality and increase speed.

The goal is achieved by

15 that a device containing input elements built on transistors of the first conductivity type, the emitters of which are connected via resistors to the power bus and the bases

X) transistors of the second conductivity type, the emitters of which are connected to the common bus through resistors, a current switch is introduced, built on

transistors of the first conductivity type, the base of the switching transistors of which are connected to the emitters of the transistors of the second conductivity type of the corresponding input elements, the collectors of the transistors of the first conductivity type of which are connected via resistors to the common bus and the bases of the current transistors of the switch.

In the drawing, the electrical circuit of the AND-AND-AND / AND-AND-AND-NOT logic circuit is given.

At the input of the element used input transistors of pnp type

1 ... 2 ... 2, 3 ... 3, ..., rv, with emitter and collector loads. The emitters of the input transistors 1 ...., The corresponding series are connected to the bases of pn-transistors of 58 emitter followers. The output stage is a current switch. The bases of the reference transistors 13–16 are connected to the collector loads of the input transistors, and the bases of the switching transistors 19 and 20 of the current switch are connected to the emitter loads of 17 and 18 pnp transistors.

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Negative logic is used to analyze the operation of an element, when a positive voltage is taken as a logical O and a negative one is taken as a logical one.

The device works as follows.

On the emitter load of transistors 1, IK, the logical function is realized: Au | A (;, similarly for transistors 2 ... B, for transistors Zi. -3k С С ,, for transistors k - 4w-D / j 0 (. On the emitter load 17 common for pnp-p transistors 5 and 6 (based on the switching transistor 19 of the current switch), the function А А + + В, Qfff is realized. On the emitter load 18

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(based on the switching transistor 20 of the current switch) function C, j C, + D D is implemented. Transistors 13–16 are used as the current switch transistors, on the basis of which signals from collector loads 9–12 of the input transistors, paraphase signals with emitter loads of input transistors. Due to the paraphase control mode of the current switch

at the output 21 a logical function is implemented (A Aj, + B, B) + + (/ CK + 0 Od,), at the output 22 a function Y is realized.

The use of a paraphase control mode by a current switch allows eliminating additional reference voltage sources, slightly increasing the switching process of the element and increasing its noise immunity margin with high logical flexibility.

To reduce power consumption and increase the speed of the element, small logical differences of 0.2 - O are used. The input transistors operate in an active normal mode, and at an input voltage corresponding to I, the collector load is calculated so that corresponded to Ui / Z + (50 - 100) m8, and at the input voltage O - 1) / 2 - (50 - 100) m8. Note that in the particular case of not using the circuits of the transistor 20 of the current switch, logical functions AND-OR / / AND-OR-NOT are implemented,

The power supply voltage of this element can be reduced to 1.2 V and the total power consumption to less than 1 mW, as a result of which the element can be effectively used in ultra-high-speed LSIs (primarily of the matrix type).

Formula of invention

An AND-AND-AND / / AND-OR-AND-NOT logic element containing input elements built on transistors of the first conductivity type, whose emitters are connected via resistors to the power bus and transistor bases of the second conductivity type, the emitters of which are connected to common via resistors a tire that is distinguished by the fact that, in order to expand functionality and increase speed; A current switch is introduced into it, built on transistors of the first conductivity type, the bases of switching transistors of which are connected to the emitters of transistors of the second conductivity type of the corresponding input elements, whose collectors of transistors of the first conductivity type are connected via resistors to the common bus and ba

Claims (1)

Claim The AND-OR-AND / / AND-OR-NOT logic element containing input elements built on transistors of the first type of conductivity, the emitters of which are connected via resistors to the power bus and the bases of transistors of the second type of conductivity, the emitters of which are connected through the resistors to the common a bus, which differs in that, in order to expand the functionality and increase the speed, a current switch is built into it, built on transistors of the first type of conductivity, the base of the switching transistors of which are connected to the emitter frames of transistors of the second type of conductivity of the corresponding input elements, the collectors of transistors of the first type of conductivity of which are connected through resistors to a common bus and ba5 deputy of the reference transistors of the current switch.