SU961118A2 - Digital double-phase shaper of sine signals - Google Patents

Description

(54) DIGITAL TWO-PHASE GENERATOR OF SINUSHINE

one

The invention relates to a pulse technique.

According to the main author. St. No. 599335 is known for a digital two-phase sinusoidal signal generator, which contains a master pulse generator, two pulse converters, whose inputs are connected to the low-pass filter inputs, respectively, a code comparison unit, the first input of which is connected to the input jg of the first pulse converting unit, the other input is connected to the output of the code comparison unit, the remaining inputs of the code comparison unit are connected respectively to the bit outputs of the second 6no-i5 recalculation unit and the outputs of the code setting unit, disk ode phase shifter and a switch, wherein discrete fazosdvigatep input connected to the output of the master pulse generator 20 outputs the discrete phase shifter from the first input pulse conversion unit via a switch, and the first output of the discrete phase shifters coupled to vhoSIGNALOV

the house of the second block recalculation of impuces directly S.

A disadvantage of the known device is the additional error in setting the phase shift between sinusoidal signals due to the conversion of the pulse signals of the scaling circuits to sinusoidal and inter-channel communication between the reference and measuring channels of the generator.

The purpose of the invention is to increase the accuracy of setting the phase shift between sinusoidal signals.

Claims (2)

The goal is achieved by the fact that the digital two-phase generator of sinusoidal signals is supplemented by the first and second switches, a phase detector and a digital computing device, the first output of which is connected to the control input of the switch, and the input-to output-phase detector, the reference and measurement inputs are connected to the outputs the first and second switches, the signal inputs of which are connected respectively to the outputs of the impedance and low-pass conversion blocks, and the control inputs to the second output of the Frova computing device, wherein the digital vychispi "Tel'nykh device comprises units for comparing, storing and subtracting codes. The drawing shows a structural electrical circuit of the generator. The sinusoidal signal generator contains a master pulse generator 1, a discrete phase shifting unit 2, a blog 3 and 4 impulse recalculation, a switch, a code comparison unit 6, a code setting unit 7, 8 and 9 low-pass filters, the first and second switches 1U and 11, phase detector 12, digital calculating unit 13, the output signals are taken from outputs 14 and 15. The output signals of the master oscillator 1 pulses are fed to the input of the discrete phase-shifting unit 2, which is, for example, an N-digit shift register with a cross bubbled bonds. The output signals of block 2 are 2N pulse signals of the square wave type with frequency. shifted relative to each other for the period of the input signal, .. frequency for Gyy giving generator 1 pulses. One of these pulse signals, conventionally taken as zero, is fed to the input of the pulse converting unit 3. One of the pulse signals of unit 2 is fed through a switch 5 to the input of the unit 4 of the pulse recalculation and the gate input of the unit 6 of the code comparison. Each of blocks 3 and 4 of recalculation has a capacity of 36 x 10, where K is determined by the required discrete phase. The signals of the output triggers (not shown) of blocks 3 and 4 of the recalculation, which are pulses of the type of a square-wave, arrive through the low and low frequency filters 8 and 9 on the outputs 14 and 15 of the device. The output signals of the triggers of the conversion unit 3 are fed to the polling inputs of the code comparison unit 6, the input inputs of which are connected to the code setting unit 7. At the moment of equality of codes on the falling edge of the pulse voltage supplied to the gate input of the comparison unit 6 - codes, a reset pulse is generated by the conversion unit 4. In other words, in block 4, Wudet’s recalculation is recorded zero when in block 3, the count will fix a number that matches the code of the specified phase shift coming from block 7, setting the code and, therefore, the output pulse signal of the last trigger of block 4 will be delayed relative to the corresponding reference canap signal by ib / i Tjr Dj where B is an integer from a natural number of numbers. From O to 36, corresponding to the Set Shift Code. Thus, the phase shifts (in degrees). set with greater sampling. , n Ti: 5 Moreover, since the conversion unit 4 is connected via switch 5 to one of the 2 N outputs of the discrete phase-shifting unit 2, the output pulse signal of the last trigger of the conversion unit 4 is delayed relative to the corresponding signal of the reference channel by the value of D-b, ; - TagU 1, where & (2N, 1) - integer - the number of the selected output of the discrete phase shift 2. Thus, the phase shifts (in degrees) are set at a low sampling rate. L IN s, b.1oi-g This obbtotestvo allows the correction of the phase error of the generator. To do this, in one cycle, the output signals of the conversion unit 3 and the filter 8 of the reference channel are connected to the phase detector 12 and the result of the measurement is recorded in the digital calculating unit 13 H 1 - Mop-% f, where Chop; of the phase of the output signals of the conversion unit and the filter of the reference channel, respectively. In the next measurement cycle, the output signals of the recalculation unit 4 and the filter 9 of the measuring channel are connected to the phase detector 12 and the measurement result is recorded, where the counters of the recalculation unit and the filter of the measuring channel, respectively. Comparing the results of measurements of the first and second measurement cycles, we have).) The first term in this expression characterizes the phase 596 shift between sinusoidal bars of the scaling circuits, and the second term corresponds to the phase shift between the output sinusoidal signals of the generator. If DF O / then this indicates the presence of the phase error of the generator and hedgehog is eliminated by applying a control signal from the digital numeral unit 13 to the switch 5, which changes the phase shift of the discrete phase-shifting unit 2 by the value of Alp .. Formula of the invention Digital two-phase sinusoidal generator on auth. St. No. 599335 characterized in that, with a chain of increasing the accuracy of setting the phase shift of the sinusoidal signals, it is additionally equipped with first and second switches, a phase detector and a digital computing device, the first exit of which is connected to the control input of the switch, and the input the output of the phase detector, the reference and measurement inputs of which are connected respectively to the outputs of the first and second switches, the signal inputs of which are connected respectively to the outputs of the pulses and Φ low-pass filters, and controllers to the second M11 INPUT of a digital computing device. Sources of information taken into account in the examination 1. USSR Author's Certificate No. 599335, cl. N OZ K 3 / 8O, 1976.