SU1016838A1 - Frequency converter - Google Patents

Abstract

1. A FREQUENCY CONVERTER containing a sequentially connected phase shifter, a balanced mixer and a low-pass filter, the second input of a balanced mixer connected to a source of the converted signal, characterized in that, in order to increase the conversion ratio, between the source of the converted signal and the input of the phase shifter are connected in series frequency divider and linear voltage generator. 2. The converter according to claim 1, differing in that the phase shifter contains serially connected pulse generator, frequency divider, time modulator, constant-duration pulse generator and bandpass filter, (L and the control input of the phase shifter is the control input of the time module torus, and the input of the pulse generator is connected to the source of the signal to be converted.

Description

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WITH

00 The invention relates to radio engineering and can be used in radio receiving, radio measuring and other devices. : A stroboscopic frequency converter is known, based on the asynchronous effect of a signal being converted with a frequency f. u and nanosecond sequences. strobe pulses with a clock frequency fu - 4 to the signal and, respectively, control inputs of the key, at the output of which the charge capacitor dp is stored to store the signal level tl. The conversion factor of such a frequency converter .. ft W TiTs Tn V-G, - G (tTRG (TH-TC) TC n -t v is the period of the R n X transform in terms of the frequency of the signal, which cannot be large, since It is required that the read step T Tc-TC be significantly less than Tf, i.e., Tj and T are comparable, but when comparable in magnitude. Their mutual instability due to the absence of a hard link between the signal frequency and the frequency; pulses is the cause of the instability of the frequency conversion coefficient. The frequency based on the phase shifter in the continuous rotation mode as a frequency-shifting device, the balanced mixer on which one input receives sig ("ay with frequency w, and on the second" turn the output voltage of the capacitive phase-shifter, which is applied to the voltage an electric motor with an angular speed52 C2J. The conversion ratio in this case is determined by the ratio h | - K, where the frequency of the input signal and D is the angular velocity of the motor driving the rotary phase switch, th output voltage. Dp Liver constancy -TUK must be maintained with high SI accuracy even at a fixed input signal frequency iA Instability (and even with stabilization 51 also leads to a change in K, which limits the possibility of obtaining large K values. The well-known converter also has a common disadvantage - the impossibility of obtaining large values of the conversion ratio of K in - due to the absence of a hard link between the values of and and Q even if the frequency of the converted signal is fixed; w The purpose of the invention is to increase The goal is achieved by the fact that a frequency converter containing serially connected phase shifter, balanced mixer and low-pass filter, the second balanced input of the mixer connected to the source of the converted signal, connected in series between the source of the converted signal and the input of the phase shifter divider frequency and linear voltage generator. On the one hand, the phase shifter contains a series-connected pulse shaper, a frequency divider, a time modulator, a constant-duration pulse generator, and a bandpass phi / 1TTP, and the equalizer input of the phase shifter is a control input of the time modulator, and the input terminal pulses connected to the source of the converted signal. FIG. 1 shows the functional electrical circuit of the convertible converter; in fig. 2 is a diagram of his work. Preo {N, the applicator contains a pulse shaper 1, a divider 2 frequencies, a time modulator 3, a generator of 4 pulses of constant duration, a band-pass filter 5, a divider of frequency 6, a generator of linearly varying voltage, a balanced mixer 8 and a low-pass filter 9, The Converter operates as follows. The input transducer 1 pulses and the input of the frequency divider 6 receives the input transform signal of a sine-wave forlly Ug Vi {Fig. 2a) i The pulse sequence from the output of the pulse generator 1 (Fig. 2b) is fed to the input of frequency divider 2, from which the sequence of rectangular pulses of the divided frequency uj -h is fed to the triggering input of the time modulator 3 (FIG. 2c). The pulse sequence from the output of the divider b of the frequency Q -f (Fig. 2d) is fed to the input of the generator 7 Linearly varying voltage, from whose step the sequence of sawtooth-shaped pulses with the repetition frequency fit w Nin is fed to the control input of the temporary modulator 3 (Fig 2d from the output of the time modulator 3, a sequence of rectangular pulses w of frequency W -jjL with a duration varying from period to period according to a linear law (Fig. 2e) is fed to the input of the generator 4 of pulses of constant duration, which starts The rear edges of these pulses are produced.The sequence of rectangular, constant pulse IT pulses, whose delay time inside peri2 М ° TtT varies linearly (Fig. 2g), enters the input of a bandpass filter 5, from which the harmonic oscillation of constant amplitude from A frequency of 52 (Fig.. 2z) is fed to the second input of the balanced mixer 8, the first input of which is fed to the converted signal. From the output of the low-pass filter 9, the voltage of the converted frequency and -O sinSZt are removed. Thus, i translates the frequency of the signal UBX) into a low frequency ft. The instability of the conversion coefficient due to the independence of the UI changes is peculiar to the analogs considered above and is absent in this case, and therefore the conversion coefficient can be made sufficiently large by changing m and N. If N is chosen, 10–20 and m 100–500 (which is easily done) 10 -10 with HIGH stability. Thus, the use of a spectral-pulse phase shifter as a frequency-shifting device allows frequency conversion with a high value of the conversion factor and its high stability, which is important for solving phase metering tasks (transferring the measurement of phase shifts from high frequencies to low frequencies by frequency conversion).

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Claims (2)

1. A FREQUENCY CONVERTER containing a phase shifter connected in series, a balanced mixer and a low-pass filter, wherein: the second input of the balanced mixer is connected to the source of the converted signal, characterized in that, in order to increase the conversion ratio, between the source of the converted signal and the phase shifter control input are included a series-connected frequency divider and a ramp generator. 2. The converter according to π. 1, about that. The phase shifter contains a serially connected pulse shaper, a frequency divider, a time modulator- _β torr, a pulse generator of constant duration and a band-pass filter, with the control input of the phase shifter being the control input of a temporary modulator, and the input of the pulse shaper is connected to the source of the converted signal. g ns Fig. 1 σ> 00 w 00