SU964965A1 - Frequency spectrum shaping device - Google Patents

Description

one

The invention relates to radio engineering, as well as to measurement technology and can be used in transceiver devices as a frequency synthesizer.

A device for generating a frequency grid comprising a series-connected reference oscillator, a control unit, a first memory register, a first one is known. a multi-frequency generator, a first key and a load, as well as a second memory register connected in series, a second multi-frequency generator and a second key, whose output is connected to another load input, while the control inputs of the first and second switches are connected to the forward and inverse outputs of the selector respectively and the bit inputs of the second memory register are connected to the corresponding bit outputs of the control unit 1.

However, this device does not provide high spectral purity of the output oscillations.

The aim of the image is to increase the spectral purity of the output oscillations.

The goal is achieved in that the device includes first and second pulse edge selection blocks, a countable trigger, the direct output of which is directly connected to the recording control input of the first memory register and through the newly introduced first delay line to the first input of the selector; I, and inverse output. counting trip-er connected to the control input of the recording of the second memory register and through the newly entered

10 a second delay line with a second input of the selector, the direct and inverse outputs of which are respectively connected also to the input of the first and second pulse edge selection blocks, while the outputs of the first 5 and second pulse edge selecting blocks are connected to the reset inputs of the first and second memory registers, respectively ti.

The drawing shows the principal

20 is an electrical circuit of the proposed device.

The frequency grid generation device includes a reference generator t, a control unit 2, a first memory register 3, a first speed treating generator 4, a first key 5, an agrueco 6, a second memory register 7, a second multi-frequency generator 8, a second key 9, a selector 10, the first and a second pulse edge selection unit 11 and 12, a counting trigger 13, a first delay line 14, a second delay line 15. The device operates as follows. With the arrival of the first impulse from. the reference generator 1, the logic zero signal at the output of the counting trigger 13 is changed to a logical unit, which is fed to the recording control input of the first register 3, in which the combination received from the control unit 2 is recorded, after which the transient rise in the first multi-frequency oscillator starts 4. The first key 5 is closed at this moment, since the selector (trigger) 10 is in the initial zero state, which changes only when the pulse from the direct output of the counting trigger 13 through the output signal There is a delay line 14, the delay time of which is equal to the rise time of oscillations in the first multi-frequency generator 4. After the transient process in the first multi-frequency generator 4 is completed, the first key 5 opens and the oscillation from the first multi-frequency generator 4 is separated by the arrival of the next the pulse from the reference generator: 1, the counting trigger 13 and the control unit 2 change their state, but the transient process in the second multi-frequency generator 8, the second key 9, lasts for a while. is closed, and the first multi-frequency oscillator 4 oscillates at the output of the device, since the prohibition signal acts at the recording control input of the first memory register 3. After the end of the transient process in the second multi-frequency generator 8, the selector 10 changes its state, the second key 9 is closed, the first key 5 is closed, and through the first allocation unit Fr jra of the pulses 11 is set to the zero state the first memory register 3, those. the oscillations are disrupted in the first multi-frequency generator 4-With the following clock pulse, the described process repeats, only the change of the zero state of the selector 10 and the collapse of the loops in the second multi-frequency generator 8 occurs after the pulse from the inverse output of the counting trigger 13 through the second line {delay 15 and the second memory register 7 is set to the zero state through the second pulse edge selection unit 12. Thus, the application of the invention allows to achieve a spectrum in stationary mode. cial purity output oscillation inherent kazhdomu- individually multifrequency generator (synthesizer). In this case, the level of side components with respect to the carrier can be minus 80 dB and lower, which is not enough in prototype. Invention Formula A frequency grid shaping device comprising successively connected reference oscillator, control unit, first memory register, first multifrequency oscillator, first key and load, as well as serially connected second memory register, second multifrequency oscillator and second key, the output of which is connected to another load input, while the control inputs of the first and second keys are connected respectively to the forward and inverse outputs of the selector, and the bit inputs of the second memory register are dyne with the corresponding output outputs of the control unit, which is due to the fact that, in order to increase the spectral purity of the output oscillations, the first and second blocks of the pulse front were introduced, the counting trigger, the direct output of which is directly connected to the recording control input of the first memory register and through the newly introduced first delay line to the first selector input, and the known output of the counting trigger is connected to the write control input of the second memory register and through the newly entered second line LCDs with the second WMO; The house of the selector, the direct and inverse outputs of which are respectively also connected to the input of the first and second pulse edge selection units, with the outputs of the first and second selection blocks. the pulse fronts are connected to the reset inputs of the first and second registers g amti, respectively. Sources of information taken into account during the examination 1. Dixon R. K. Broadband systems. M., Sw., 1979, p. 106 (prototype).

Claims (1)

Claim A frequency grid forming device comprising a reference generator, a control unit, first connected in series. a memory register, a first multi-frequency generator, a first key and a load, as well as a second memory register connected in series, a second multi-frequency generator and a second key, the output of which is connected to another load input, while the ₂₃ control inputs of the first and second keys are connected respectively to direct and inverse selector outputs, and the bit-wise inputs of the second memory register are connected to the corresponding bit-wise outputs of the control unit, characterized in that, in order to increase the spectral purity of the output fucking, the first and second pulses of the front of the pulses are introduced, a counting trigger, the direct output of which is directly connected to the 35th recording control input of the first memory register and through the newly introduced first delay line with the first selector input, and the known counting trigger output is connected to the second recording control input40 cerned memory register and the newly introduced through a second delay line with a second WMOs _t selector house, direct and inverse The yields rows respectively which are also connected to the input of the first and second blocks vy45 de eniya edge pulses', the outputs of the first and second pulse edge allocation units are connected to the reset inputs of the first and second memory registers.