SU1053263A1 - Ssb signal former - Google Patents

Abstract

A single-band SFSRMIRS signal containing two single-band modulators connected in series, the first input of the first single-band modulator being the input of the modulator of the single signal of the former, and the second input connected to a source of modular signals, which also has a single waveform, and the same input signal is connected to a single waveform modulator. increasing the suppression of the parasitic spectral components; the source of the modulating signals is connected via the input phase shifter to the second input of the second single-band modulator. с € (Л с: fig. / S6b.g (t)

Description

The invention relates to radio engineering and can be used to generate a single band signal, for example, in various microwave measurement settings. A single-sided shaper is known, which contains a single-phase ferrite phase shifter with a modulating coil, a linearly periodic sawn-current generator with a modulating coil. However, in this single-sided shaper, the modulating spectral components are slow and the modulation frequency is low which is limited by the speed of the modulated spectral component inertial properties of the ferrite resonator. The closest to the proposed is a single-band signal generator containing two consecutive single-sided modulators, the first input of the first single-sided modulator being the input of the other signal of the single-sided signal generator and the other input being connected to the source of the modulating signals, 1 The second single-sided modulator is the input of the second modulating signal, and each single-sided modulator contains a balanced modulator and a band-pass filter 2 .. One The parasitic spectral components in the well-known single-band signal are also relatively large due to the difficulty in filtering them as the shift frequency increases, especially at high conversion frequencies. The purpose of the invention is to increase the suppression of the parasitic spectral components. To do this, in a single-band signal driver that contains two successively connected anopole Modulators, the first input of the first single-band modulator is a modulated signal input of the shaper. The single-band signal is twisted, and the second input is connected to the source of modulating signals, the source of modulating signals through the input phase-shifter is connected to the second input of the second one single band modulator. FIG. t presents a structural electrical circuit of the attached single-band single-band signal; in fig. 2 - the laws of change of the modulus to the phase of the transmission coefficient of the first and second single-band modulators; on fig.Z. - suppression of the largest parasitic spectral component in the output signal spectrum with respect to the useful first hryonyka depending on the phase deviation. The single-sided signal shaper contains the first and second single-sided moduli 1 and 2, the source of the modulating signal 3 and the phase reflector 4, the single-sided signal shaper works as follows. In the case of each single-sided modulator 1 and 2, for example, in the form of a single-sided modulator on a single-ferrite monofistal with a modulating coil tunable linearly-periodically by a source of modulating signals 3, the microwave signal is fed to the input of the modulated signal of the first single-sided modulator 1, a the modulating signal is from the source of modulating signals 3 directly to the second input of the first single-band modulator 1 and. via phase shifter 4 to the second input of the single-sided modulator 2. In FIG. Figure 2 shows the laws of modulus and Φ | amp of the transfer coefficient in time separately for the first single-sided modulator 1 (curve a), the second single-sided modulator 2 (curve 6), and the whole of the single-sided signal (curve b). When they are connected in series in the absence of mutual coupling between them, the phase angles of the transfer coefficients are summed and the modules are multiplied. With a phase back delay of 4 modulating signals for half the period, the resulting transfer coefficient of the serial connection of the first and second single-sided modulators 1 and 2 will have a repetition frequency twice as large as the repetition frequency of the sawtooth signal, have a small modulus imbalance and a greater linearity of phase change. Due to this, the frequency-shift of the signal is doubled compared with the frequency of the saw-tooth signal, and the period of change of the resulting gain is twice the period of the modulating signal (Fig. 2). The dependences of suppression of the largest pa (1-posit spectral component in the output spectrum with respect to the useful first harmonic for one single-band modulator are shown in Fig. 3, at the output of the whole single-side signal generator, in Fig. 3 9 From the dependences it follows that in the proposed / G / ) / 10532 634 driver achieves a significant increase in the suppression of retransmitted spectral components (more than 30 dB) with respect to the useful first harmonics with increasing shift frequency.

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Claims (1)

A SINGLE-BAND SIGNAL FORMER, comprising two serially connected single-band modulators, the first input of the first single-band modulator being an input of a modulated signal of a single-band signal shaper, and the second input connected to a modulating signal source, characterized in that, in order to increase the suppression of spurious spectral components, the source of modulating signals through the introduced phase shifter is connected to the second input of the second single-band modulator. _with * SS ω CZ of FIG. 7> FIG. 2 - the laws of change in the modulus and phase of the transmission coefficient of the first and second single-band modulators; on fig.Z. - suppression of the largest spurious spectral component in the spectrum of the output signal relative to the useful first harmonic depending on the phase deviation. Shaper single-band signal contains the first and second single-band modulators 1 and 2, the source of modulating signals 3 and phase shifter 4, Shaper single-band signal operates as follows. In the case of the execution of each single-band modulator 1 and 2, for example, in the form of a single-band modulator on a ferrite single crystal with a modulating coil, tunable according to the linear-periodic law by a source of modulating signals 3, the microwave signal is fed to the input of the modulated signal of the first single-band modulator 1, and the modulating the signal is from the source of modulating signals 3 directly to the second input of the first single-band modulator 1 and. through a phase refresher 4 to the second input of the second single-band modulator 2. In FIG. 2 shows the laws of change. module and phase of the transmission coefficient in time separately for the first single-band modulator 1 (curve a), the second single-band modulator 2 (curve S) and the entire single-band signal shaper (curve b). With their sequential connections in the absence of mutual relationship between them, the phase angles. transmission factors are summarized, and mo40 1 1053263