Hybrid frequency synthesizer with improved spectral characteristics

摘要

A useful model refers to radio engineering, in particular to frequency synthesizers. ; The hybrid frequency synthesizer contains a frequency reference generator with two outputs, a frequency-phase detector with two inputs and an output connected through a low-pass loop filter to a voltage-controlled generator whose output is the output of the entire device and through a directional coupler is connected to one of the inputs of the mixer, One of the outputs of the reference oscillator is connected via a frequency multiplier to a digital computational synthesizer, whose output through the bandpass filter is connected to the second input of the mixer, The output of which is connected through a frequency divider to one of the inputs of the frequency-phase detector. Also includes an additional digital computational synthesizer having a clock input that is connected to the second output of the reference oscillator and an output connected to the second input of the frequency-phase detector.; The technical result is an extension of the range of frequency tuning of the output signal of the device, a decrease in the level of spurious components of the spectrum of the output signal of the device. 1 yl.