Frequency doubler that does not require adjustment. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Frequency doubler that does not require adjustment. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering /Nodes of amateur radio equipment

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The disadvantage of frequency doublers, often used in digital systems, is the need to tune for each specific frequency. The proposed circuit, designed for use in dividers by N, does not require adjustment in the range from 0 to several megahertz.

As the signal passes through the circuit, each inverter, in addition to inverting the pulse, introduces a small delay (typically 20 ns). So, for example, the signal at point D is inverted 60 ns after the input signal is inverted at point L, therefore, high potentials are maintained at both inputs of gate 6 for 60 ns after switching the input signal at point A from low to high. In this case, the output voltage of valve 6 (point F) decreases 60 ns after the arrival of a positive drop at the input of the circuit. An almost analogous process takes place in valve 5; the only difference is that a low potential is formed at its output for 60 ns after the arrival of a negative input edge. In the circuit shown in the figure, inverters 1, 2, and 3 perform a dual function in generating negative 60 ns pulses at points F and G. This circuit design allows you to reduce the number of gates.

Frequency doubler that does not require adjustment

The output pulses of valves 5 and 6 are fed to the inputs of valve 7', which generates a positive pulse of 60 ns when the potential at any of its inputs decreases. The decrease in potential at one input coincides with the rising edge of each input pulse at point A, and the decrease in potential at the other input coincides with the trailing edge, so the frequency of the output pulses at point H doubles with respect to the input at point A.

Author: N. McGahee; Publication: N. Bolshakov, rf.atnn.ru

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