PL111120B1 - Binary frequency divider - Google Patents

Description

The present invention relates to a binary frequency divider, especially for very high frequency systems.

Frequency dividers built on bistable multivibrators are known. One can distinguish among them simple multivibrators built on discrete elements, requiring the use of costly elements such as tunnel diodes, cargo diodes, or Schottky diodes in systems forming triggering pulses.

There are also bistable multivibrators that do not require the formation of triggering pulses, but due to the large number of elements that make up such systems and the associated occurrence of parasite frequencies, the upper operating frequency of systems made in the version on discrete elements is limited to 300 MHz. Synchronized astable multivibrators are also used for frequency division.

Such solutions include the system described in the American journal "Elektronics" (March 4, 1968 pp 87, 88) in the article by D. E. Sanders entitled "Adding to Transformer Halves UHF Freauencies".

The system employs a broadband phase inverting transformer.

The aim of the invention is to build a binary frequency divider based on an astable multivibrator constructed on discrete elements, ensuring correct operation of the divider at frequencies up to 1 GHz, with an effective suppression of the input synchronizing signal.

In a binary frequency divider built on the basis of a synchronized symmetrical astable multivibrator, according to the invention, the source of the signal with a given frequency is connected to the multivibrator collector resistors and, through inductance, to the power source pole, making the emitters of the multivibrator's reference point connected to the divider through a parallel RC connection and with the inputs of a differential amplifier whose output is the output of the frequency divider.

The circuit according to the invention provides a frequency division in the range of up to 1 GHz without introducing its own perasite frequency modulation, and a strong second harmonic suppression, tantamount to the elimination of the input synchronization signal from the output signal.

The subject of the invention is shown in the example of the embodiment in the drawing showing the schematic diagram of the divider.

The binary frequency divider is built on the basis of a synchronized symmetrical astable multi-vibrator. The multivibrator, operating on two transistors T1 and T2 of the same type of conductivity, has a positive base-collector feedback realized by voltage level shifting elements, which are Zener diodes Dl and D2 and base resistors R5 and R6 111120x ¦ ' ? .¦: ** ¦: ¦ 111120 3 linked to the divisor datum. The supply voltage + U is fed through the supply resistor R7 and the inductance L to the collector resistors R1 and R2 of the multivibrator. The emitters of the transistors T1 and T2 of the multivibrator are connected to the divider reference point through the parallel RC unit R3, Cl and R4, C2 and with the inputs of the differential amplifier W.> The astable multivibrator is controlled by a signal from a source with a frequency f from sides of the common point of the collector resistors Rl and R2 and inductance L. The emitters of the transistors Tl and T2 receive a signal with a frequency of 1/2 and then shifted to the output of the differential amplifier W. The differential amplifier W is used to improve the characteristics spectral divider, especially for attenuation of the second harmonic of the output signal. Parallel KC R3, Cl and R4, C2 determine the natural frequency of the multivibrator.

Patcnto warning Binary frequency divider, especially for circuits of a very large part of the volatility, built on the basis of a synchronized symmetrical astable multi-vibrator having two transistors of the same type of conductivity, in which the base of each and of the transistor is it is connected via a voltage level shifting element to the second collector, and the transistor, characterized in that the source of the signal with a given frequency (f) is connected to the collector resistors (R1) and (R2) of the multivibrator and through the inductance (L) to the pole of the power source (+ U), the emitters tr. i: zy.; lo:;, v / (Tl) and (T2) niulliwib * atora connected. \ a with the divisor reference point through the parallel \\ C mi of the differential amplifier (W), whose outputs RSW Zakl. Graph. w-wa, Srebrna 16. ¦ /. 117-Bl / O - 130 •! ¦ 20 cg.

Price 45 PLN