SU951674A1 - Bipolar pulse shaper - Google Patents

Description

The invention relates to an information technology and can be used in information transmission systems.

A pulse shaping device is known, consisting of two microcircuits, one of which is a generator, and the second is a standby multi-vibrator. The input of the waiting multivibrator is connected to the inverted output of the generator, and its output through a resistor is connected to the base of the transistor switch. The direct output of the generator through a resistor is connected to the output of the transistor switch and the input of the emitter follower. The output signal is taken from the output of the emitter follower. The circuit is powered by a two-pole power supply of 3 V and has three stable states —3 V, O B, +3 V C 1,

A disadvantage of the known former is the need to use two power sources.

The closest in technical essence to the proposed is a bipolar pulse shaper, which contains a two-input element OR, connected to an information input and an input for clock pulses, a NOT element with an open collector, and an auxiliary resistor, whose input is connected to information

10 entrance. The output of the element is NOT through a logic circuit connected to a 3-stage negative pulse shaper. The output of the element OR through the second element is NOT and the integrated amplifier is connected to a 3-stage positive pulse driver. The driver circuit of different-polarity pulses operates from a bipolar power source 2.

Claims (2)

20 A disadvantage of the known device is that for its powering it is necessary to have two sources of constant voltage, which limits the capacity of the former and does not allow, in particular, to use it in cases where the weight and dimensions of the information transmission system show are increased requirements, or when the introduction of an additional remote supply bus is associated with significant material costs. The purpose of the invention is to expand the functionality due to the possibility of forming a series of different polarity pulses, simplifying and increasing reliability. The goal is achieved by those. that a known driver containing a two-input element OR, connected to the information bus and a bus for clock pulses, a NOT element with an open collector and an auxiliary resistor, is equipped with a shaping capacitor, a load resistor and. two diodes, one of which is connected by an anode to a power source and by a cathode through a resistor to an output of an NOT element, whose input is connected to a clock bus, the second diode is connected to an output of an OR two-input element, and from an output of the driver and through a load resistor g with the power bus, and between the output of the former and the input of the element is NOT included the shaping capacitor. FIG. 1 shows a block diagram of a bipolar pulse former; in fig. 2 - temporary diagrams of work. The bipolar pulse shaper contains a two-input element 1 OR, the inputs of which are connected to information input 2 and the input of clock pulses 3. The output of two-input element 1 OR is connected via diode 5 to the output of the shaper 6 and through the load resistor 7 to the power supply 8. To power supply 8 Also, the anode of diode 9 is connected, which is connected via cathode through auxiliary resistor 10 to output 1 of element 12 NOT with an open collector whose input is connected to a clock bus 3. Between the output of the element NO 12 and the form output bodies 6 13Istochnik included forming a capacitor connected to a power supply source 8 and to the generator common bus and operates as follows. At the input 2 of the imager, information pulses of positive polarity of a cyclic nature are received (Fig. 2). After the termination of, for example, the fourth pulse to the input of the clock pulses 3 of the driver, the end signal of the cycle UQ is given, which, after passing through the driver, appears at its output 6 as a signal of negative polarity. The process of forming two-pole signals can be divided into three stages. In the time interval t.-t2, when the signal at input 3 is zero, element 2 is NOT in the state of logical 1. Information pulses are transmitted to output Q of the two-input element 1 OR Positive voltage levels U block diode 5, which leads to to the level of the power source 8, the voltage at the output 6 of the driver. Since the diode 9 is connected by an anode to the power supply 8, the shaping capacitor 13 is not discharged, and the resistors 7 and 10 and the diode 9 do not affect the flow of information pulses at the output 6 of the driver. Thus, the shaper passes informational impulses without distortion. In the pauses between the information pulses, the forming capacitor 13 is charged to a voltage close to the voltage of the power supply 8. The output of the two-input element 1 OR has a zero potential in the pauses, and the shaping capacitor 13 is charged from the power source 8 through the diode 9, the resistor 10 and the diode 5. The constant charge is determined by the capacitance of the shaping capacitor 13 and the resistance of the auxiliary resistor 10, which can be chosen small enough. Practically, the charge of the capacitor 13 ends in 1-2 pauses between information pulses. At the time point, input 3 receives a loop termination signal from (Fig. 2), which is transmitted to output t of the two-input element OR 1, causing the diode 5 to be locked and also. Translates element 12 NOT to the logical zero state at output P. As a result, forming the capacitor 13 is connected by a charged positive right lining on the common bus. Since the left side of the capacitor plate 13 is charged before the voltage of the power supply source 8, then in the time interval of output 6 a signal polarity is formed with an amplitude close to the supply voltage. Thus, the device allows to transform two sequences of unipolar pulses into a sequence of bipolar pulses. In this case, only one power source is required to power this bipolar signal conditioner. Invention Form Bipolar pulse former containing a two-input element OR connected to a data bus and a clock bus, a NOT element with an open collector and an auxiliary resistor, characterized in that V5 n expanding the functional possibilities, it is equipped with a shaping capacitor, a load resistor and two diodes, one of which is connected to the power source by an anode and the cathode through a resistor to the output of the HE element whose input is connected to the sync pulse bus; OR and the anode - with the output of the imaging device and through the load resistor with the power bus, and between the output of the imaging device and the output of the element is not included the shaping capacitor. Sources of information taken into account during the examination 1. Korotinsky A. A device with three equilibrium states. Electronic technology in automation 1972, H 9 2. Shumilin V. Converter bipolar code. Factsheet number 75-076, VIMI, 1975. in --OF P W 13 6 about t about / -about