SU1543543A1 - Device for automatic tuning of oscillatory circuits - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to improve the accuracy of tuning multi-extremal resonant systems with a discrete variable capacitor with an arbitrary law of change in reactivity. The device contains an oscillating circuit 1, a discrete capacitor 2 of variable capacitance, an amplitude detector 3, a generator of 4 clock pulses, a counter 5, registers 6.9 and 10, an ADC 7, a block 8 of code comparison, a block of controlled keys 11, a trigger 12 and a decoder 13 In setup mode, counter 5 receives pulses from generator 4, activated by trigger 12. Counter 5, controlled by switching the branches of capacitor 2, changes the tuning frequency of circuit 1. From the envelope of the RF signal taken from circuit 1, a signal is generated that counter 5 is written to One combination, as a result of which the capacitor 2 is abruptly set to the state corresponding to the fine tuning of the circuit 1 to the global extremum of the resonant x-ki. 1 il.

Description

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The invention relates to radio engineering and can be used in the radiation paths of various radio equipment.

The purpose of the invention is to increase the point-setting of multi-extremal resonant systems with a discrete variable-capacitor variable capacity with an absolute law of change

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j The drawing shows an electrical block diagram of a dA device for automatically tuning an oscillating circuit.

The device for automatic tuning of the oscillating circuit contains an oscillating circuit 1t discrete variable capacitor 2 (DKPE), amplitude detector 3, generator 4 clock pulses, counter 5, first register b, analog-to-digital converter (ADC) 7, block 8 comparison of codes, second and the third registers are 9 liters 10, a block of 11 controlled keys, a trigger 12 and a decoder 13.

The device for automatic adjustment of the oscillation circuit is as follows.

The reset pulse resets the third register 10 into the counter and sets trigger 12 to the single output state associated with the 4 clock pulse generator. The required frequency signal is applied to the input of the oscillating circuit 1.

In the setup mode, the counter 5 receives pulses from the 4-clock pulse generator, which is turned on by the trigger signal 12. Counter 5, controlled by the 4 switching branches of the DKPE 2, measures the tuning frequency of oscillatory circuit 1. The envelope of the high-frequency signal removed from oscillatory circuit 1 is highlighted amgog by the ore detector 3 and by means of ADC 7 Converts to a digital code. The clock pulses from the output of the generator 4 provide the signals for reading resolution in the ADC 7 and the recording resolution in the first and second registers 6 and 9. Since the second register 9 was initially zeroed out, a single signal is removed from the output of block 8 Code Comparison unit 11 controlled keys and allowing recording on the falling edge of a clock pulse into (third register 10. The digital code of the signal removed from the A / D converter 7 is recorded on the leading edge of the clock pulse into the first register by a delay per clock through the block 11 controlled keys in the second register 9. Using the code comparison block 8, the voltage taken from the output of the amplitude detector 3 and the digitized ADC 7 is compared at the subsequent (code A) and previous (code B) device operation cycles.

With a monotonous upward movement of the resonance characteristic, code A is always greater than code B and the signal from the output of code comparison unit 8 allows the state 5 of the counter defining the current tuning code to be recorded in registry 6.

Use in the oscillatory circuit 1 of a real DKPE 2 with an arbitrary law of change in reactivity, i.e. with an unpredictable number of holes of various sizes and at different points in time, as well as the multi-extremes of the resonant characteristics of the electoral circuit, lead to violations of the monotonicity of the training characteristics of the circuit. In the tuning characteristic of the contour, both false extremes, caused by the characteristics of DCE, and extremes, caused by the type of resonance characteristic, arise.

After passing an extremum of any kind and different from the global extremum, the code A recorded in the first register 6 becomes less than the B code corresponding to the extreme point and recorded in the second register 9. A zero signal from the output of the code comparison unit 8 closes the control key block 11 and prohibits writing in the third register 10, in which the setup code corresponding to the first extremum encountered is fixed.

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With further rearrangement, the amplitude of the signal on the oscillating circuit 1 at some point in time again reaches a value equal to the amplitude of the first extremum. At the output of the code comparison unit 8, a single signal appears again, opening the control key unit 11 and allowing writing to the third register 10, and the process of analyzing the tuning characteristic of the loop continues.

The operation of the device nodes when approaching the second and subsequent extremes, exceeding the previous amplitudes, is similar to that described. Thus, after passing such extremes, the code of the counter 5, which determines the state of the DKPE branches at the extremum point, is fixed in the third register 10.

If in the process of further restructuring an extremum is encountered that is smaller than the last extremum recorded in the second register 9, then the signal at the output of block 8 of code 8 comparison does not change, since code A is less than code Bi. Consequently, the information in the third register 10 is not entered and the control key block 11 is still closed.

Thus, the code of the third register 10 is changed only upwards. From the moment of passing the extremum to the moment of receiving the sig

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Almost all units of the proposed device are standard digital units.

Control key block 11 is implemented on K155LAZ microcircuits, counter 5 - on K155IE7 microcircuits (the size is equal to the number of DKPE 2 branches), the first, second and third registers 6, 9 and 10 - on K155IR1 microcircuits, block 8 of code comparison 8 - on a microcircuit - I K134SP1, the decoder 13 - on the chip K155ID6, trigger 12 - on the chip K155LAZ (RS-flip-flop), ADC 7 - on the chip K1107PV2.

The 4-clock pulse generator is built on K155LAZ microcircuits.

Amplitude detector 3 is made according to the scheme of a simple diode detector.

Thus, in the proposed device, an accurate adjustment of the oscillatory circuit with a multiextremal resonance characteristic to the global extremum of the law from

The voltage from the oscillating circuit 1, the reactivity of the control elelevish on voltage, the extremum passed, the code of the third register 10 does not change.

After passing through the entire tuning range in the second register 9, the recorded information is about the amplitude of the global extremum, and in the lost register 10 with the corresponding tuning code. At the moment of filling the entire capacity of the counter 5, which indicates that the right limit of the range is reached, the signal of the decoder 13 overturns the trigger 12, including the generator 4, and providing the enable signal of parallel writing to the counter 5. The counter B rewrites the third register code 10, corresponding to the global extremum point.

Thus, the Code Combination is recorded in the counter 5, on the basis of which the DKPE 2 is abruptly set to the state corresponding to the fine tuning of the oscillatory circuit 1 to the global extremum of the resonance characteristic. This completes the setup process.

To bring the device into action, it is necessary to re-apply a reset pulse to it, and to the input of the tunable oscillatory circuit 1 - a signal of the desired frequency.

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Claims (1)

Invention Formula A device for automatically tuning an oscillating circuit, containing a series-connected clock generator, a counter, a discrete variable capacitor, an oscillating circuit, 5, the input and output of which form, respectively, the input and output of the device for automatic tuning of the oscillating circuit, and an amplitude detector, a decoder, characterized in that, in order to improve the tuning accuracy of multi-extremal resonant systems with a discrete variable capacitor with an arbitrary law of change of activity pe , the serially connected analog-digital converter, the first register, the controllable keys block, the second register and the code comparison block, the third register, and the trigger are entered At the same time, the output of the code comparison unit is connected to the control input of the third register and the control input of the controllable key block, the input of the analog-digital converter is connected to the output of the amplitude detector, the output of the clock generator is connected to the control inputs of the first, second, third registers and the control input analog digital 7 15435438 the converter, the first control trigger control input, the first trigger copy output is the control input connected to the control input of the device for the automatic on-clock generator, and the oscillating circuit secondary and the swarm output to the second control input - United with the first control input of the counter, the inputs of the third register counter and the second control input of the controller are connected to the corresponding output of the second register, the inputs of the counter decoder rotora of the counter, and the outputs are connected to the corresponding output Damis respective mounting vho- MF etchika and output - with a second counter vhodomdami.