SU1385232A1 - Oscillating frequency digital generator - Google Patents

Abstract

The invention relates to radio engineering and communications. The purpose of the invention is to provide control of frequency deviation. H. contains the specifying Mr. 1, the trigger (T) 2, - counters (C) 5 and 6, reversible C 7, counting T 8, shaper 9 control pulses, DAL 10. E-3 and 4 are entered , tunable Mr. 11. Before starting work, T 2, C 5 and 6, C7, T8 are reset to their initial state. The reset signal forms the shaper 9. Input information. The signal contains information: the binary code of the period, the magnitude and average frequency of the deviation, as well as the reset and the strobe of the recording of this information in C5, 6ivC7. After the Start command, T 2 is set to one state, the sequence of pulses goes through e-t 4 to the counting input C 5, which forms the period of deviation. From the output of C 5, the pulses arrive at C 6, to-ry determines the magnitude of the deviation, and on C 7, to-ry determines the average frequency. The impulses from C 6 arrive at T 8, to-ry switches C 7. to addition and subtraction. At the output of the D / A converter 10, in addition, a step-increasing voltage is obtained, and in the case of subtraction, a step-down voltage is obtained. This voltage is applied to r-11, to-ry and produces a frequency deviation in accordance with the input binary code. 1 il. ё (L

Description

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:

Khodnapin; Shornatsi

from 00 ate

HS

with y

The invention relates to radio engineering and communications and can be used in measuring the frequency characteristics of radio engineering devices and their elements.

The purpose of the invention is to provide control of frequency deviation.

The drawing shows a structural electrical circuit of a digital oscillator of oscillating frequency (GCN).

Digital GKCH contains master oscillator 1, trigger 2, second element IZ, first element AND A, first and second counters 5 and 6, reversible counter (PC) 7, counting trigger 8, driver 9 for control pulses, digital-to-analog converter (CLP) 10 , tunable generator 11. Digital GCU works as follows.

The master oscillator 1 generates a periodic sequence of pulses, which is fed to the first input of the first element AND 4. Before starting work, the trigger 2, the first and second counters 5 and 6, the reversing counter 7, and the counting trigger 8 are reset to their original state. formed by shaper 9. Then the external information is recorded through the second element And into the first and second counters 5 and 6 and the reversible counter (PC) 7. The recording gating signal is formed by the shaper 9. The input information signal with holds the information: the binary code of the period, the magnitude and average frequency of the deviation, as well as the reset and strobe of recording this information in the first and second counters 5 and 6 and in PC 7. After the Start command entering trigger input 2, trigger 2 is set to the unit state is .the sequence of pulses arrives through the first element I 4 to the counting input of the first counter 5, which forms the period of deviation. After each overflow of the first counter 5, its output impulse goes to the former 9, which generates a pulse of regeneration of the input code, everything happens in the second counter 6 and PC 7 similarly. From the output of the first counter 5, the pulses go to the counter input of the second counter 6, which is summing and determines the magnitude of the deviation, and

PC counting input, which determines the center frequency. The pulses from the second counter 6 are fed to the counting trigger 8, which switches the PC 7 to addition or subtraction. The outputs of the bits of the PC 7 are fed to the DAC 10, the output of which, when added, produces a stepwise voltage, and when it is subtracted, a step-down voltage. This voltage is applied to tunable oscillator 11, which produces a frequency deviation according to the input binary code. Thus, a digital GKCH provides control of frequency deviation.

Claims (1)

Invention Formula Digital oscillator oscillator. frequencies containing a master oscillator, a serially connected first counter, a second counter, a counting trigger, a series-connected reversing counter and a digital-analog converter, a driver of control pulses, and a trigger characterized in that, in order to control the frequency deviation, between the output of the master The first generator And the other input of which is connected to the trigger output, as well as the second element And whose output is connected to the information inputs of the first and second counters and the reversible counter, the tunable generator, the input of which is connected to output digital-to-analog converter, with the installation inputs of the first and second counters and the reversible counter, the counting trigger and the trigger are combined, the first, second and third inputs of the driver control imp pulses are connected to the outputs of the first counter, second counter, and reversible counter, the output of the counting trigger is connected to the control input of the reverse counter, the counting input of which is connected to the output of the first counter, the information input of the control pulse shaping unit is combined with the first input of the second element And, and is the information input of a digital oscillator of the oscillating frequency, the second input of the second element And, per31385232 the reversing input's left installation input, the inverse output of the counting trigger, the inputs of the preload are connected to its additional reversible counter, per-set input, second input The first and second counters are connected to the jogger, which is the control input of the corresponding control output signal of the digital generator to the driver of the pulse control frequency generator.