SU746948A1 - Storing frequency divider - Google Patents

Description

(54) ACCUMULATING FREQUENCY DIVIDER The invention relates to a pulsed technique, in particular, to pulse counters with many stable states. A cumulative frequency divider containing a thyristor on transistors of different conductivity is known, between the collector of one of the transistors and the base of the other, connected according to the common emitter circuit, a storage capacitor is connected, and the collector of the discharge transistor, connected to circuit with a common base, and its emitter is connected to a source bus of a pulse signal through a diode-resistive current switch. The divider is powered from the constant voltage source, and the impulses are fed to the discharge circuit 1. The disadvantages of the known cumulative frequency divider are the low reliability of the device operation due to the absence of control circuits for the start of the clock of the divider, which are necessary for the construction of multi-stable phase elements. The aim of the invention is to increase the reliability of the device in operation and to reversely control the start of the beat of the output pulses. The goal is reached by the fact that the collector of the frequency containing the thyristor on transistors of different conductivity, the collector of the first and the emitter of the second is connected to a common bus through the corresponding resistor, and a collector is connected to the collector of the first and second transistors of the common transistor, connected by a common base circuit, the emitter of which through a resistor is connected to the emitter of the first transistor of the thyristor, additional transistors are introduced of different conductivity, connected according to a circuit with a grounded base, the collectors of which are connected to the collector and emitter of the discharge transistor, respectively, and their emitters to separate control buses, with the emitter of the first transistor of the thyristor connected to the pulse source bus.

The drawing shows the basic electrical circuit of the cumulative frequency divider.

Cumulative frequency divider contains a thyristor on transistors 1 and 2, storage capacitor 3 is connected between the base of transistor 2 and resistor 4 (collector load of transistor 1). Discharge chain; the frequency divider is made up of resistor 5 and transistor 6. The frequency divider is fed (together with the discharge circuit) with the energy of the input pulses to be divided, via the bus 7. Transistor | Ы 8 and 9 are used for reversing shift of the beginning of the cycle of the sequence of output pulses of the divider. . Why dp

shift to the left, use the bus 10, and to shift to the right, control bus 11. The output of the device is the collector of transistor 1 ..

Accumulative frequency divider works as follows. In the initial state, when the pulses on the bus 7 are absent, the device is de-energized. When the pulse sequence of positive polarity is fed to the input bus 7, the first pulse through the resistor 5 opens the transistor 6. The collector current of this transistor turns on the transistor 2, which in turn turns on the transistor 1. A voltage appears on the resistor 4 (divider output) which goes on to the base of transistor 2 through capacitor 3. An avalanche-like process takes place. 13 $ 11АRIM TriRs of a torus on speed 1 and 2. At the same time, a capacitor 3 through the transistor IGI collects the junction of the transistor b the amplitude of the input pulses. With oKOHimiteeM of the first pulse, a capacitor 3, charged with a minus sign on the base of transistor 2, locks it, in turn, it in turn locks up transistor 1. This state of transistors 1 and 2 will remain until the capacitor is discharged 3

The discharge of the capacitor 3 begins with the second input pulse, which through the resistor 5 opens the transistor 6 By an era, equal to the duration of the input pulse. In this case, the capacitor 3 is discharged to a certain step. The number of steps of capacitor 3 determines the division factor.

After the capacitor 3 is discharged, the next input pulse causes the thyristor to open and the avalanche-shaped process described above develops in the circuit.

To shift the start of the cycle of the sequence of output pulses to the left, bus 10 is fed a pulse of positive polarity with a duration equal to the duration of the input pulses. In this case, the transistor 8 is unlocked and the capacitor 3 is discharged additionally to a certain step, which speeds up the cycle of its discharge by one step in time.

To shift the start of the clock cycle of the sequence of output pulses to the right, a pulse of negative polarity is applied to the pulse 11. The transistor 9 is turned off and blocks the input pulse to the transistor 6, and thus the voltage on the capacitor 3 does not change, since its discharge cycle is delayed by one step.

Claims (1)

Invention Formula A cumulative frequency divider containing a thyristor on transistors of different conductivity, the collector of the first and the emitter of the second are connected via a common resistor to the common bus, and a capacitor is connected between the collector of the first and the base of the second transistor, and the collector of the discharge transistor connected to the base of the second transistor base, the emitter of which through a resistor is connected with the emitter. the first thyristor transistor, which also means that, in order to increase the reliability of the device and reverse control of the start of the clock cycle of the output pulses, additional transistors of different conductivity are included in it, which are included in the circuit with a grounded base, whose collectors connecting, respectively, to the collector and emitter of the discharge transistor, and their emitters - to separate control buses, with the emitter of the first transistor of the thyristor connected to the pulse source bus. Sources of information taken into account during the examination 1. USSR author's certificate N 483795, cl. H 03 K 25/06, 1973. fl9f