A simple synchronous frequency multiplier. Scheme, description

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A simple synchronous frequency multiplier. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Radio amateur designer

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For radio amateurs who are fond of digital technology, dividing the frequency of pulse signals is not difficult. But if it is necessary to multiply the frequency of output signals that are synchronous with respect to the input, designers face serious difficulties. Usually, resonant circuits, harmonics of input signals are used for this purpose. Thus, the frequency multiplier described in [1] is relatively simple, but it provides only the selection of high-frequency output signals generated by an autonomous generator within the input pulse period.

A diagram of a simple frequency multiplier with a variable multiplication factor and tight synchronization of the output signals with respect to the input ones is shown in fig. 1. It consists of a pulse generator on three inverters DD1.1-DD1.3 and a synchronizing stage on the transistor VT1 and is close in circuit to the device described in [2].

Simple Synchronous Frequency Multiplier

When there are no input clock pulses, the multivibrator on DD1.1-DD1.3 operates normally. If a microcircuit with two protective diodes at the input is used in the generator, the recharge time of the capacitor C1 for any polarity is the same and the pulse period will be 1,4 R3∙C1, and the frequency f is 0,7 / (R3∙C1).

When positive pulses of frequency Fin arrive at the input VT1 (Fig. 2), the transistor opens at the moments t1, t3, which leads to the disruption of the process of periodic recharging. After closing it from the moment t2, t4, the generation process is resumed. The generator generates pulses that are synchronous with respect to the input ones with a frequency Fout = kFin, where k is a variable multiplication factor determined by the elements R3, C1, and Fin is the frequency of the input pulses.

Simple Synchronous Frequency Multiplier

As elements of DD1, you can use any inverters of microcircuits of the K176, K561, KR1561 series. In addition, elements DD1.1, DD1.2 can be without inversion (buffers) or with hysteresis (Schmitt triggers). It is permissible to replace the KT315 series transistor with another similar one.

This device, when applying to the input of the horizontal frequency pulses of the television scan, allows you to select strictly defined sections of the raster line for the formation or reading of information.

Literature

Frequency multiplier. "Abroad" - Radio, 1997, No. 9, p. 47.
Bannikov V. Digital frequency multiplier. - Radio, 1999, No. 1, p. 49.

Author: I.Zabelin, Moscow

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