SU377869A1 - SAMPLE CURRENT SHELLER - Google Patents

Description

one

The invention relates to computing technology and can be used as a 1 {: actuator of current sampling of address circuits of operational storage devices (RAM) and super-operative storage devices (RAM) made on magnet and its elements.

Transistor current drivers for sampling, including input and output stages with transformer coupling between them and used in compact memory devices on magnetic elements for generating pulses of the sampling systems are known.

A disadvantage of the known driver is the H1alnchee in it of an interstage communication transformer, leading to a distortion of the current pulse front of the sample, limiting the speed, limiting the degree of possible integration of the framing electronics of memory devices.

In addition, the current sampler with interstage transformer coupling is not designed for direct connection with a complex of control logic circuits.

The aim of the invention is to improve the edges of the current pulse of the sample, increase the speed and noise immunity of the circuit, ensure direct communication with the complex of control logic circuits and increase the degree of integration.

To achieve this, a second pn / g transistor transistor is additionally introduced into the output stage of the current sampler, the base of which is connected to the emitter of the first transistor, and between the emitter and base of each transistor is connected a transponder of parallel connected bias resistor and a discharge diode, which the anode is connected to the emitter of the corresponding transistor.

The drawing shows the electrical circuit of the current sampler.

The proposed device contains:

The input stage 1, made according to the scheme with o6nj, HM emitter on the transistor 2 n-p-type with collector load 3, resistors - base 4 and bias 5, common point 6 of the connection of which is connected to the driver input; the second terminals of the bias resistor 5 and the collector load 3 are connected to the positive power source

separation capacitor 7 connected between the output of the input stage / and the input of the output device 8 (points 9 and 10)

key output stage 8, made as a composite transistor with a common emitter on two transistors 11 and 12 n-p- / g-type, the base-emitter transitions of which are ground by each of the parallel-connected resistors 3 is, 14, respectively, and discharge diodes 15 , 16, respectively, connected by anodes to the emitters of the respective transistors 11, 12. The collector load 17 of transistor 11 is connected to the common bus 18 of the forma- tor 5, the emitter of this transistor is connected to the minus of the second power source, and the collector is connected to output f rmirovatel, the signal from which is supplied to vagruzku. The sampling current driver works barely-10 in the following way. In the static state, i.e., in the absence of sampling signals, when the potential of point 6, determined by the initial state of the output stage of the logic control circuit is 15, is high, transistor 2 is in saturation mode. The composite transistor I-12 is in cut-off mode, which is ensured by selecting certain values of bias resistors 13, 14. Condens-20 tor 7 is charged along the circuit: base-emitter junction of transistor 2, bias resistors 13, 14, power supply —Eb, to power supply voltage EQ. At the same time, the potential of point 9 is positive, and points 10 -25 are negative. When a negative pulse impulse arrives at the input, the transistor 2 switches to the cutoff mode. The capacitor 7 is charged at the same time to approximately 30 voltage supply sources (), the conversion of the composite transistor // - 12 to the saturation state. In the load of the current sampler, the sampling current flows. At the end of the input command, the tr anzi-35 stop 2 returns to the saturated H1 mode. The capacitor 7 is discharged along the circuit: the collector-emitter junction of the transistor 2, the common driver bus 18, the source - EU, the discharge diodes 15, 16. Transi-40 stor //, 12 go to the initial state - reset cutoff, interrupt current in the load. 4 Thus, the proposed sampling current shaper allows direct control from the complex, allows direct control from the complex of control logic circuits (for example, on elements such as FCM, TUR, PRIZE), ensures the formation of a sampling current without a separation transformer. cascade and weekend. The absence of a communication transformer significantly improves the shape of the current pulse of the sample, providing sufficiently large current pulse edges (on the order of 20 s / s), reduces the total delay, extending the operating frequency of the driver to 500 kHz and higher with an amplitude of the output pulse of about 300 ma At the same time, the optimal value of the capacitor of the coupling capacitor is in the range of 0.01 µF, which makes it possible to perform the current sampler in a hybrid-integrated version, thus significantly reducing the size and weight of the electronic framing of the memory devices. The subject invention The current sampler that contains the input a cascade connected through a capacitor to a key output cascade on a transistor of a lp - "- type according to a common emitter circuit, characterized in that, in order to increase speed and interference widening of the circuit, an additional pnpp transistor is additionally inserted into the output cascade, the base of which is connected to the emitter of the first transistor, and between the emitter and base of each transistor a circuit is connected from a parallel-connected bias resistor and discharge diode, which is anode-connected to the emitter of the corresponding transistor.

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