SU517152A1 - Periodic Pulse Frequency Multiplier - Google Patents

Description

The invention relates to automation and computing, S digital frequency synthesizers, frequency meters, pulse sequence makers and other devices can be used to multiply the frequency of a periodic pulse OT,

A periodic pulse frequency multiplier is installed, containing a pulse counter, the counting input of which is connected — the output of the controlled oscillator, and the inhibiting input — to the terminal of the reference frequency source.

Le, r; b invention - increase the reliability of the device.

In the proposed frequency multiplier, the input is the adder, the code difference calculator, and a differentiating chain, with one input of the code difference calculator connected to the bit of the code of the multiplication factor, other inputs to the bit outputs of the impulse counter, the setting of which has zero through the differentiating chain connected to reference frequency terminal, readout calculator

codes are located to the source terminal of the reference part, and the outputs through the adder to the digital inputs of the control of the alternator.

The drawing shows the structure

device schema.

Frequency multiplier frequency multiplier contains a controlled oscillator 1 with a Y-digit digital input, a pulse counter 2, a calculator of a difference of codes 3, a differentiating chain 4, an adder 5, and a code bit of the multiplication factor 6.

The multiplier works as follows. The pulse counter 2 is reset to the zero state by the falling edge of the reference frequency pulse through the differentiating chain 4, after which the counting of the output pulses of the generator 1 is immediately resumed. Therefore, by the time of arrival, the next reference pulse in the counter and the pulses appear

Claims (1)

recorded number of MF control generator; The TQ-period of the reference frequency pulses), which does not change, since the reference frequency pulse prohibited the generator 1 pulses to pass to the next reset of the counter to the zero state. The calculator difference codes 3 generates at the output the difference 0 N ,, .- {т4-). o is the multiplication factor; N y „1 is the maximum number with I in all bits of the adder 5; .-. N ,, l is the binary number stored and with in the adder; {Q - reference frequency; L fvrrtiaK / Nf ' -frequency charging of the controlled oscillator 1, which is impulsed by a reference frequency pulse to the adder 5, where it is added with the number NU g and the new sum goes to the digital inputs of the generator 1. At the time of the next impulse the reference frequency changes the generator hour and the number of the counter 2, and the numerator of the difference 3 records the difference - cM-Tj;: K- (bf) -NHc. in the general case, when changing the code of the multiplication factor N .. (- () NX - () - NMCO, where N, .- „is the number recorded in the sum of zero (first after changing the code N) pulse of the reference frequency, T - sequence number of the pulse frequency after changing the code. Taking into account, 4ToAf / f ,, N «1, we take (f. M) () about 1 t / i.e. with each pulse of the reference frequency, the mismatch resulting from the multiplication factor reduction decreases by one order the instability of the generator 1. At a certain value of K, it is practically iipa K 2-3) Nx-Ncu .-- N, -fy, .. At the same time counter 2, with the occurrence of the next reference pulse, is equal to N. the frequency of the controlled oscillator corresponds to, the error of the frequency of the output pulses is determined by the stability of the reference frequency f. and the discreteness of the multiplication factor. Claims The multiplier of the periodic pulses, containing a pulse counter, the counting input of which is connected to the output of the controlled oscillator, and the inhibiting input - to the terminal of the reference frequency source, which, in order to improve the reliability, is added to the adder, difference calculator codes and a differentiating chain, with one input of the calculator of the difference of codes connected to the bus of the bits of the code of the multiplication factor, the other inputs to the discharge outputs of the pulse counter, the input of the zero setting of which is black of a differentiating circuit connected to the terminal reference frequency source input difference calculator ch read codes to the terminal reference frequency source, and through the adder vylody - digital inputs controlled oscillator.