SU452828A1 - Frequency subtractor - Google Patents

Description

The invention relates to the field of radio electronics and can be used in automation, digital, computing and measuring equipment. A device for subtracting frequencies is known, containing a 3-k trigger, the single and zero inputs of which are connected respectively to the first inputs of the first and second coincidence circuits, and the single and zero outputs to the second inputs of those coincidence circuits, the outputs of which are connected respectively to the first and second output devices. However, when the input signals coincide in time, the known schemes based on the O-k flip-flop work ambiguously. In order to eliminate this drawback in the proposed device, the first input of the device is connected to the input of the additional driver and through the delay circuit to a single input 3-k of the trigger. The first output of the additional shaper is connected to the first input of the additional matching circuit, the second input of which is connected to the second input of the device, and the output is connected to the zero input of the additional trigger, the single input of which through the first differentiating link is connected to the secondary driver and the single input the output is with the first input of the OR circuit, the second input of which is connected to the second input of the device, and the output, via the second differentiating link with zero input 3, of a trigger. FIG. 1 is a functional diagram of the device; FIG. 2 - time diagrams of his work. The single and zero inputs D of the flip-flop 1 are connected to the first inputs of the first and second matching circuits 2 and 3, the second inputs of which are connected to the outputs of the flip-flop 1. The outputs of the matching circuits 2 and 3 are connected to the outputs 4 and 5 of the device. The first input 6 of the device is connected to the input of the additional shaper 7 and through the delay circuit 8 to the single input of the trigger 1. The first output of the shaper 7 is connected to the first input of the additional matching circuit 9, the second input of which is connected to the second input 10

the device, and the output with a zero input dololitele 1X) trigger 11, The single input trigger 11 through the first differentiating element 12 is connected with the second output of the former 7, and the single output -1; the first input of the OR circuit 13, the second input of which is connected to the input 10 of the device, and the output through the second differentiating element 14 to the zero input of the trigger 1,

FIG. 2 denotes: a - signals at the input 6 of the device, c - Signals at the output of delay circuit 8, c - pulses at the first output of the driver 7, (- pulses at the output of the first differential link 12, e - signals at the input 1O of the device,

 - the output signal of the additional trigger 11, - the signal at the output of the second Yi1}) of the activating link 14.

The signals arriving at the input 6, npj- move t to a single input of the trigger 1 with some delay, determined by the operation of circuit 8 (Fig. 2 a, e).

If the signals arriving at the device input 10 do not coincide in time with the pulse at the first output of the imaging unit 7 (FIG. 2, c), the signal at the output of the circuit 13 OR does not differ in parameters from the input signal at input 10. At the output of the second differentiator 14, the signal is generated at the falling edge of the input signal, so that the signals 1W of the inputs of the trigger 1 do not coincide in time.

In case of coincidence of the signal on the output of the driver 7 with the signal on. input 10 (phi1. 2, c, e), the pulse from the output of the coincidence circuit 9 provides for switching trnp-er 11 to the state (Fig. 2,). The reverse switching of the trigger 11 is carried out by the signal cL, which coincides with the auxiliary pulse front at the output of the driver 7.

Since the signal at the zero input of TriGer 1, generated by the second differential link 14, coincides with the falling edge of the pulse at its input, in this (.: Beam it is formed with a delay relative to the signals on the output pa of the output of circuit 8,

The processing of signals at the input of the subtraction circuits does not necessarily ensure the stable operation of a tritg-er with arbitrary

time ratio of input signals. With a change in the phase of the signals at the input 10 with respect to the pulses at the input 6, the pulses at the output of the second differentiating link 14 are formed after the signals at the output of the circuit 8 all the time until the pulses at the input 1O begin to anticipate the signals on the input 6. At the time of the transition the next signal from the input 10 arrives with a delay (synchronously with the signal at the output of the first differentiating element 12), and the next one, which does not coincide with the pulse at the input of the driver 7, enters the input of trigger 1 without delay, earlier than the signal from the output of circuit 8. When the atom is between TKE time limited two consecutive pulses at input 6, the input of the trigger 1 comes on two ikshulsa entry 10. This provides formiroranne signals at the output 5 of the device at the time of phase transition through zero znacherie.

Subject invention

A device for subtracting a Partial, containing a 3-k trigger, the single and zero inputs of which are connected respectively with the first inputs of the first and second circuits, matches, and the single and zero outputs with the second inputs of those matching circuits, whose outputs are connected respectively with the first and second output. By the device, characterized by the fact that, in order to increase the accuracy of the device, the first input of the device is connected to the input of an additional form and through the delay circuit to the unit input J of the flip-flop; the first output of the additional formatting module is connected to the first input of the additional matching circuit, the second input of which is connected to the second input of the device, and the output to; the zero input of the additional 1) trigger, the single input of which is connected to the second output through the first (1) ferrous link; an additional driver, and a single output - with the first input of the circuit. Claim 1 OR, the second input of which is connected to the second input of the device, and the output - through the second Dl (} and || track link of the zero input J - “tripper.

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