SU790102A1 - Device for precision shaping of recurrent frequency-modulated signals - Google Patents

Description

the adder's house, and the second and third outputs of the synchronizer are connected to the control key of the key and the second meter input, an analog-to-digital converter, two combinational adders, a memory of the addressing unit, a register, two correction blocks, a digital-to-analog converter and a smoothing filter are inserted, and the output the meter is connected to the third and fourth inputs of the adder, both directly and through successively connected analog-to-digital converter, first combinational adder, memory block, register, first block correction, the second combinational adder, digital-to-analog converter and a smoothing filter, respectively, in addition, the outputs of the analog-digital converter through the second correction block are connected to other inputs of the second combinational adder, the register outputs are connected to the second group of inputs of the first combinational: adder, and clocking inputs and inputs The settings of the initial states of the register and of both correction blocks are connected to the red and fifth outputs of the synchro-synchronizer, the sixth output of which is connected kzhe through the address block with the address inputs of the memory block.

Fig, 1 shows the structural diagram of the proposed device; in fig. 2 time diagrams: a - the nature of the frequency change at the output of the controlled oscillator; b - type of error signal in analog e (t) and conditionally in digital% (t) form; в - digital signal eu (fc) at the register output; d is a digital signal e (b) at the output of the first Raman adder; d, e, g - digital signals in the k -th cell of the memory block. ti, y 1, 2. 3.

The device contains a reference generator 1, a phase detector 2, the first input of which is connected to the first output of the reference generator 1, and the output; via key 3 and filter 4 - with the first input of the adder 5, the output of which is connected through a controlled oscillator 6 to the second input of the phase detector 2 and the first vkods meter 7, synchronizer S, the input of which is connected to the second output of the reference generator 1, the first output the synchronizer 8 is connected via a modulator 9 to the second input of the adder 5, and the atorob and the third outputs of the synchronizer 8 are connected to the control stick of the key 3 and the second input of the meter 7. The analog-digital converter 10 is inserted into it,

Two combinational adders 11, 12, memory block 13, addressing block 14, register 15, two correction blocks 16, 17, a digital-to-analog converter id and a smoothing filter 19, with the output of meter 7 connected to the inputs of adder 5 both directly and sequentially included analog-digital converter 10, first combinational adder 11, memory block 13, register 15, first correction block 16, second combinational adder 12, digital-to-analog converter 18 and smoothing filter 19, besides analog-to-digital converters l 10 through the second correction unit 17 connected to the other inputs of the second adder combination 12, the outputs of register 15 are connected to a second group of inputs of the adder 11 of the first combination, and timing. The inputs and inputs for setting the initial states of the register 15 and both correction blocks 16, 17 are connected to the outputs of the synchronizer 8, which is also connected via the address block 14 to the address inputs of the memory block 13.

The device works as follows.

Claims (2)

In the intervals between the formation of frequency-modulated signals, the system of phase-controlled initial frequency, consisting of a reference oscillator 1, a phase detector 2, a key 3, a filter 4, an adder 5, a controlled oscillator 6, reduces to zero the error signal at the output of the meter 7. At times tst Cj-i) where TY, is the modulation period; jj is the period number counted from the moment the device is turned on, key 3, at the command of synchronizer 8, opens the initial frequency auto-tuning ring, and modulator 9 starts adjusting the frequency of the controlled oscillator 6 through the adder 5. During the generation of the frequency-modulated signal, the frequency variation deviation . f (i,) from the given (t) (Fig. 2a) results in the appearance at the output of the meter 7 of the error signal e (t) (Fig. 2 b). This error signal through the adder 5, as well as after conversion to the digital view e) and passing through the second correction block 17, the second combinational adder 12, the digital-to-analog converter 18, the smoothing filter 19 and the adder S, has a direct adjusting effect on frequency of controlled oscillator 6. In addition to directly affecting the frequency of controlled oscillator 6, CV: nap. errors in the digital b (t) form are used to form a compensating voltage applied to the input of the controlled oscillator 6 in subsequent modulation periods. The possibility of applying such a compensating voltage is based on the fact that the errors in frequency-modulated oscillators — on average, from one period to another, are almost constant. The main unit involved in the formation of a compensating voltage is memory block 13, each cell of which replaces one of the integrators present in a known device. The cells of the memory block 13 at the moment of switching on the device can either be reset to zero or contain a priori information about the nature of the compensating voltage, obtained from the results of preliminary measurement of the nonlinearity of the modulation characteristic of the controlled oscillator 6 or on the basis of the previous switching on of the device. Consider the process of forming a compensating voltage in the -th after the device is turned on during the modulation period. In time intervals. ., gdet, / T; - 1.2. 3 ... is the cell number of the memory block 13, the numerical information k ,, k from the V -th cell of the memory block 13 is rewritten into the register 15 (Fig. 2 a), in which it is stored for a time T determined by the period sampling error signal. A record of new numbers (Fig. 2 d), representing the sum of% (Fig. 2 g) numbers e and § 1 from the outputs of the analog digital converter 10 (Fig. 26) of the d-register 15 (Fig. 2 c) in | d -) the cell of the memory unit 13 is carried out in time intervals. Ito (i-rgn, t (knVr-T4d-i) Tn, shown in Fig. 2 with dc slanting dash. Formed on the basis of measurements of the error signal in previous periods of modulation and contained in the register 15-voltage. Where I - 1,2,3 ... -1, after passing the first correction block 16, the second combiner adder 12, the digital-analog converter 18, the smoothing filter 19 n adder 5 compensates for the inherent control generator 6 and modulator 9 errors, repeated from one modulation period to another. The correction blocks 16 and 17 entering into the device are both generate the required dynamic characteristics. The use of these digital blocks allows you to realize the desired gain for voltages in and 6p with a high degree of accuracy. The invention. A device for precise generation of repetitive frequency-modulated signals containing a reference oscillator, phase detector, the first input of which is connected to the first output reference generator, and the output through a switch and filter with the first input of the adder, the output of which is connected via a controlled generator to the second input phase detector and the first input of the meter, the synchronizer, the input of which is connected to the second output of the reference generator, the first output of the synchronizer is connected via a modulator to the second input of the adder, and the second and third outputs of the synchronizer are connected to the control input of the key and the second input of the meter, different that, in order to demonstrate the accuracy of the Inadequacy, an analog-to-digital converter, two combinational adders, a memory block, an addressing block, a register, two correction blocks, a digital-analogue signal were entered into it generator and smoothing filter, with the meter output connected to the third and fourth inputs of the adder, both directly and through series-connected analog-digital converter, first combiner adder, memory block, register, first correction block, second combiner, digital analog converter and a smoothing filter, respectively, besides the rOj outputs of the analog-digital converter through the second correction block are connected to the other inputs of the second icOM-combinational adder, output The register dyes are connected to the other inputs of the first combinational adder, and the clock inputs and the installation inputs are the head of the register states in the correction blocks. connected to the fourth and fifth outputs of the sync compressor, the sixth output of ko.77901028 This is connected via address block c1. USSR author's certificate the address inputs of the memory block ty. No. 526997; cl. H 03 B 3/04, 1976. Information sources, 2. US patent No. 3.899.448, taken into account during examination. 252-551, 1972. Pi / e.f. t her