SU1647856A1 - Scmitt trigger - Google Patents

Abstract

The invention relates to microelectronics and can be used in the input stages of large and extra large integrated circuits. The purpose of the invention, the reduction of power consumption, is achieved by reducing the switching energy of a Schmitt trigger. The introduction of the switching-off transistor 3, the amplifying transistor 11, resorption transistors 4 and 7, the input transistor 2, the feedback transistor b, the transistors 5,10 and 13, the current source 14 provides for the forced on and off of the output transistors 9 and 15. 1 Il.

Description

UNION OF THE SOVIET SOCIALIST REPUBLICS ,,., SU „„ 1647856 A1 «1) 5 Н 03 К 3/295

STATE COMMITTEE

BY INVENTIONS AND DISCOVERIES

AT SCST USSR,

DESCRIPTION OF THE INVENTION

TO AUTHOR CERTIFICATE (21) 4488758/21 (22) 03.10.88 (46) 07.05.91. Bull. No. 17 (72) A.R. Galyautdinov, A.G. Garitsyn, I.N. Klopov, V.N. Nazarenko and T.V. Svintsitskaya (53) 621.374 (088.8) (56) Zeldin E.A. Digital integrated circuits in information-measuring equipment, - L .: Energoatomizdat, 1986, p. 196, fig. 10-29.

(54) Schmitt Trigger (57) The invention relates to microelectronics and can be used in input. cascades of large and super-large integrated circuits. The purpose of the invention is the reduction of power consumption is achieved by reducing the switching energy of the Schmitt trigger. The introduction of the turning-off transistor 3, the amplifying transistor 11, the resolving transistors 4 and 7, the input transistor 2, the feedback transistor 6, the transistors 5,10 and 13, the current source 14 provides for the forced switching on and off of the output transistors 9 and 15. 1 ill.

(L

1647856 A1

Schmitt trigger works as follows.

Logic level O is applied to the input of the circuit, transistor 5 is open, and the current of current source 14 flows through bus 18 to the base of transistor 9, and logic 16 is present at output 16 ”1.

As the input level rises, a current flows through an open transistor 2, which is amplified by transistor 11 and flows into the base of transistor 15. At the same time, transistor 4 opens and the current decreases to the base of transistor 9. As a result, the voltage at the base of the transistor 9 and at the output 16 of the circuit 15 decreases, the transistor 6 opens and the current of the current source 14 enters the base of the transistor 11, with a further decrease in the output signal, the transistor 2 closes. When the voltage at the output 16 20 reaches the logical 0 level, the diode 12 is turned on and the excess current of the current source 14 enters the collector of the transistor 15. The diode 8 supports the voltage required to close it based on the transistor 9. The consumption current in this case is close to the current of the source 14. The transistor 15 is turned on by the current from the external circuit through the transistor 2, therefore, the current of the source 14 is necessary only to maintain a high or low 30 output level and therefore can be quite small.

When the voltage at input 1 decreases to the level of CBe, transistor 11 closes and transistor 3 opens and the current of transistor 35 10 enters the base of transistor 9, the voltage across it increases and transistor 7 opens, bypassing the base of transistor 15 to a common bus 17. The voltage at output 16 rises to the logic level “1 and 40, transistor 6 closes, and transistor 2 opens, shunting the base of transistor 3. In this case, transistor 13, charging the capacitance, turns off transistor 10. Current consumption in the logical state” 1 at output 45 is determined by leakage currents tr nzistornyh structures, and therefore close to zero.

Claims (1)

Claim Schmitt trigger, containing the first 50 output bipolar transistor, the collector of which is connected to the power bus, the emitter to the output of the circuit and the collector of the second bipolar output transistor, the emitter of which is connected to the common bus, 55 characterized in that, in order to reduce power consumption by reducing it switching energy, an amplifying bipolar transistor is introduced into it, the collector of which is connected to the power bus, the base is connected to the base The invention relates to microelectronics and can be used in input stages of large and ultra-large integrated circuits. The aim of the invention is to reduce power consumption by reducing the switching energy of a Schmitt trigger. The drawing shows a circuit diagram of a Schmitt trigger. 10 The input 1 of the Schmitt trigger is connected to the drain of the input η-channel transistor 2, the emitter of the turn-off bipolar transistor 3, the gates of the second p-channel absorbable 4 and the first p-channel 15 transistors. The gate of the input η-channel transistor 2 is connected to the gate of the p-channel feedback transistor 6, the gate of the first p-channel absorbing transistor 7, the drain 20 of the first p-channel transistor 5, the anode of the first diode 8, the base of the first output bipolar transistor 9, and the drain of the second p-channel transistor 10. The source and substrate of the input η-channel transistor 25 of stor 2 are connected to the drain of the p-channel transistor 6 feedback, the base of the turning off bipolar transistor 3, the base of the amplifying bipolar transistor 11, the anode Diode 12 m feedback. 30 The collector of the turn-off bipolar transistor 3 is connected to the gate and drain of the third p-channel transistor 13 and the gate of the second p-channel transistor 10. The source and substrate of the p-channel transistor 6 feedback 6 are connected to the source of the first p-channel transistor 5 and negative the output of the current source 14. The emitter of the amplifying bipolar transistor 11 is connected to the drain of the first 40 resolving η-channel transistor 7 and the base of the second output bipolar transistor 15. The cathode of the first diode 8 is connected to the drain of the second absorbing transistor 4, the cathode of the feedback diode 12 is connected to the emitter of the first output bipolar transistor 9, the collector of the second output bipolar transistor 15 and the output 16 of the trigger. The sources and substrates of the first 7 and second 4 absorbable 50 η-channel transistors are connected to the emitter of the second output bipolar transistor 15 and the common bus 17. The positive output of the current source 14 is connected to the sources and substrates of the third 13 and 55 of the second 10 p-channel transistors, the substrate of the first p-channel transistor 5, the collectors of the first output 9 and amplifying 11 bipolar transistors and bus 18 power. __ 1647856 6 switching bipolar transistor, the source of the input p-channel transistor, the drain of the p-channel feedback transistor and the anode of the feedback diode, and the emitter is connected to the base of the second bipolar output transistor and the drain of the first p-channel absorbing transistor, the cathode of the feedback diode is connected to the output circuit, the gate of the first absorbable p-channel transistor - with the base of the first output bipolar transistor, the anode of the first diode, the drain of the second p-channel transistor, the drain of the second p-channel of the first transistor, the gates of the p-channel transistor of the inverse bayazi and the input η-channel transistor, the substrate and drain of the first absorbing p-channel transistor is connected to a common bus, the cathode of the first diode is connected to the drain of the second η-channel absorbing transistor, the source and substrate of which are connected with a common bus, and the gate with the gate of the first p-channel transistor, the emitter of the turning-off bipolar transistor, the drain of the input p-channel transistor and the input of the Schmitt trigger, the source of the first p-channel transistor connected to the source and the substrate p-channel. a feedback transistor and a negative terminal of a current source, the positive terminal of which is connected to the power bus, a collector. The turn-off bipolar transistor is connected to the gate of the second p-channel transistor and the gate and drain of the third p-channel transistor, the sources and substrates of the second and third p-channel transistors are connected to the power bus, the substrate of the input p-channel transistor is connected to the base of the turn-off transistor.