CONTROL SIGNAL GENERATOR OF A NEW GENERATION

Abstract

Control signal generators (SCS) allow for the rapid assessment of the condition of radio receiving
equipment during its operation, therefore, much attention is paid to their research and
development. Very often, noise generators or generators on Gann diodes with low frequency stability
are used as control signal generators. Due to the appearance of available frequency synthesizer
chips with a built-in voltage-controlled generator, an attempt has been made to use a frequency
synthesizer as a master generator in a control signal generator. The use of a frequency
synthesizer chip with sequential loading of control codes led to the need to use a microcontroller.
An experimental study of a two-frequency control signal generator has been carried out. The functional
scheme of the GCS is presented. A brief description of the element base is given. A twofrequency
synthesizer Si4133GT was used as a master generator. As the results of the study are
presented: – output signal spectrum; – waveforms of the output signal; – dependence of the output power on the frequency for three instances of the cell; – dependence of the output power on the
attenuator control code. The following results have been achieved: – operating frequencies 450
and 1200 MHz; – the output power of each channel is at least 100 MW; – relative instability of
the carrier frequency 10-5; – the attenuation range of the step attenuator is not less than 20 dB;
– pulse modulation depth of at least 30 dB; – duration range of modulating pulses from 10 to
100 microseconds; – the range of variation of the repetition period from 300 to 1000 microseconds;
– it is possible to enter an external control signal. By most parameters, the developed GCS
exceeds the parameters of the GCS previously developed at the enterprise. GCS is supposed to be
used as part of a multi-channel receiver.