SU840853A1 - Digital function generator - Google Patents

Description

The invention is an ognosigs for computing and can be used in the digital measuring equipment of infra-low frequencies, in automatic control systems. Digital function generators are known that use step approximation when reproducing functions and contain a reference clock, a code-frequency converter, a function period generator, a control unit, an irregular pulse sequence driver, a reversible counter, a reverse trigger, a counter read decoder, a quantizer functions, software atgenua-.tor reproducible functions of C. However, the known devices do not allow a parallel output of a sinusoidal and cosine wave signals. The closest in technical essence to the proposed is a digital function generator, which contains a reference clock frequency generator connected to the input of the code-to-frequency converter, the period function generator, the control unit, the outputs of which are connected to the corresponding inputs of the reference clock generator, code-to-frequency converter, function period generator 2. O Nako known generator is not allows to obtain as output sine and cosine waveforms at the same time, except that it does not allow to obtain the instantaneous values of the cosine functions.-f minus. The purpose of the invention is to expand the functionality of the generator, which consists in the possibility of the simultaneous form of the sine and cosine functions, but of the instantaneous values of these functions. This goal is achieved by the fact that the digital functional is the 1st generator, which contains the reference clock frequency generator, a code converter in a loop.

a period generator, an output unit, the output of the reference clock generator is connected to the frequency input of the code to frequency converter, the code input of which is connected to the first output of the control code of the control unit, the first startup output of which is connected to the control input of the reference clock generator, the code input of the rammer period is connected to the second output of the control code of the control block, it contains a single pulse generator, an OR element, a distributor, a

memory, octant register, switch and two digital-to-analog converters, jj

the outputs of the code-to-frequency converter and the single pulse generator are connected to the inputs of the OR element, the output of which is connected to the frequency inputs of the period generator and the distributor, the output of the period generator is connected to the installation inputs of the distributor and the octant register, the outputs of the octant registrar terminal are connected to the control ports switch and digital-analog inputs;, 25 converters, distributor output

connected to the input of the memory unit whose output is connected to the inputs to ushutag1. The lateral distributor output is connected to the first bit input of the octant register, the commutator outputs are connected to the digital inputs of the transducer language, the single pulse generator input is connected to the second start output of the control unit .55

The drawing shows a diagram of a digital function generator.

Digital f; l-1-kionial generator contains 1 clock frequency reference generator, 2 codes to frequency converter,,: Q unit 3 wiravpegt, 4 single shlpuls generator, element OR 5, period (function) generator 6, distributor 7, memory block 8 , register of 9 octants, switch of 1O codes, digital-analogue converters 45 It and 12.

The output of the reference clock generator I is connected to the input of the converter 2 codes to the frequency. The outputs of the control unit 3 are connected to the corresponding gg by the following inputs of the reference oscillator I clock frequency, the converter 2, the function generator 6, the distributor 7, the generator 4 single pulses. The output of the transducer 2 code-frequency 55 ta and the output of the generator 4 single pulses are connected through the element OR 5 to the counting inputs of the imaging unit 6 of the function period and the distributor 7.

The output of the imaging unit 6 is connected to the installation inputs of the distributor 7 and register 9 octants. The inputs of each of the converters II and 12 are connected via serially connected memory block 8 and switch U of codes with one of the outputs of the distributor 7, the other output of which is connected to the input of the register 9 octants. The outputs of the register of octants are connected to the corresponding inputs of the switch U of codes and converters II and 12.

The digital generator works as follows.

Claims (1)

There are two modes of operation; self-oscillating and single-shot mode. In the case of the self-oscillating mode, from the control unit 3, a switching potential is applied to the generator I of the tech frequency, from the output of which a uniform sequence of quartz-colored tp pulses is fed to the input of the converter 2. At the output of converter 2, there is a uniform pulse sequence with a frequency proportional to the control code installed in control block 3, which through the OR 5 element enters the counting inputs of the former Φ; / nk1yy and distributor 7 bridges. Former 6 is a digital controllable the frequency divider, the division factor of which is proportional to the 5PG1 code and equal to the number of quanta per period of the reproduced function. When posting in a formacrogel 6 a number of pulses equal to the number of quanta per function period and, consequently, equal to l of the frequency division factor 6, a pulse will be generated at the output of the latter, which will determine the initial setting of the distributor 7 and register 9 octants. The distributor 7 is a controllable reversible shift register. The pitch of the shift depends on the quantization step step of the punching argument and the set; code from control block 3. The counting input of the distributor 7 receives a uniform pulse sequence. The pulses representing the 0-1 transitions of the bits of the distributor 7 are fed to the address buses of the memory block 8. Pulses, the duration of which is one octant, from the output of the ring register of 9 octants are combined by disjunction schemes, the signals from which are operated by the switch 10 codes and converters II and 12. Memory block 8 is a permanent memory device. the output of which forms binary parallel sine codes within one octant, on the other output binary binary cosine codes. The sine and cosine codes of the angles are formed simultaneously and their value is determined by the number of pulses received at the counting input of the distributor 7 after the arrival of the initial setting pulse. In one cycle (shift to the right and to the left) of the controlled reversing shift register occurs. Formation of codes within the quadrant, From the outputs of memory block 8, binary codes of access to the switch | 10 codes. The ratios slti (45 -Q) cos (45 ° +.9) cbs (45 ° -0) 9m (45 + b) make it possible to form the SINus and cosine codes, commuting the original segments. So switching codes when; the formation within angles from 0 ° to 9 ° is carried out at the transition through the uthel 45 °. At the same moment there is a reverse distributor. The switch 10 codes is controlled by signals from a register of 9 octants. One signal commutates when JLU-i PV L are formed. Lll Jbl fJl-riJ. J .-. -f .-- - NII KODOV within the first, fourth, eighth, octants, the second within the second, third, sixth, seventh, nt, v, n of the ICO OKrtiHlXJti Thus, on one switch output 10 codes are formed parallel Binary codes corresponding to the absolute values of the sine function, and at the other output - codes corresponding to the absolute values of the cosine function. Transducers 11 and 12 convert parallel binary codes corresponding to the absolute values of the sine and cosine functions to sine and cosine voltages. In order to obtain a bipolar voltage 1, the formers And and 12 are controlled by the function sign signals from the register of 9 octants. Analog signals of sine and cosine functions are removed from the output of converters II and 12. In the case of a digital generator operating in a single-shot mode, control unit 3 is supplied with a switching potential on the generator 4 single pulses and a potential crossing the pulse transmission from the reference generator of the I clock frequency. From the output of the generator 4 pulses through the element OR 5 arrive at the counting inputs of the distributor 7 and the imaging unit 6 period functions. Further operation of the digital sine-oscillatory generator also occurs as in auto-oscillation mode. The MG values of the functions (on the I –th group) and the output of the generator are determined by the formula Ui (8) 3 (); Ui (9) UH, - cos (Nfl0) peu is the amplitude of the voltage function; N is the number of single launches (the number of impulses) received at the counting input of the distributor 7 after the initial setup pulse; Do - angle value corresponding to one discrete function; bifid is the current angle value. Thus, the proposed digital generator makes it possible to obtain simultaneously sinusoidal and cosine stress, as well as voltages corresponding to instantaneous values of FOUNDATION. The formed functions are connected in phase, which is very significant. The ball generator also makes it possible to obtain harmonic oscillations of various frequencies and various quantization steps. The use of the invention in measuring equipment allows to significantly increase the accuracy of measuring the parameters of the signals of the object of study. In addition, the digital generator allows parallel with analogue signals of the MMI signal to be removed from the outputs of the switch 1O codes parallel binary codes of orthogonal functions, as well as signals of the sign of functions from the register of 9 octants. All of the listed advantages significantly expand the functionality and scope of the digital sine-cosine generator. The invention of the digital functional generator. containing a reference clock generator, code-to-frequency converter, period generator, control unit, the output of the reference clock generator is connected to the frequency input of the code-to-frequency converter, whose code input is connected to the first control code output of the control unit, first start output which is connected to the control input of the sampled clock frequency generator, the code input of the period generator is connected to the second output of the control code of the control unit, which is that, in order to expand the func- tional capabilities of the generator, thereby enabling the simultaneous formation of sine and cosine functions and obtaining instantaneous values of these functions, it contains a single pulse generator, an OR switch, a memory block, a register of approx. tantas, switch and two digital-to-analog converters, with the outputs of the code-to-frequency converter and the generator of single pulses connecting to the inputs of the OR OR, the output of which is connected to the frequency inputs (form with in: TSL1n period and distributor, output format / ea 8 3 The period is connected to the installation inputs of the distributor and the register of octants, the outputs of the register of octants are connected to the control inputs of the switch and digital-to-analog converters, the output of the distributor is connected to the input of the memory block, the outputs of which are are connected to the switch inputs, the last distributor output is connected to perb01X input) octant register bits, the 4out-ator outputs are connected to the digital input terminals of the transmitters, the single-pulse generator input connects to the second output of the control unit start-up from the left-handed power supply source, 5x5 mts 5, 0. Enhancement of expertise for experts 1. V. Smelikov. Digital measurement of the equipment of infra-low parts,. Best regards, 1976, p. 312, U A. USSR certificate № 5O6S4S, cl. fight F 1/02, 1972 Sprotogin}. 1-f No