Broadband fine-step frequency synthesis circuit and method
A frequency synthesis circuit and fine-stepping technology, applied in the direction of electrical components, automatic power control, etc., can solve problems such as difficulty in upgrading, and achieve the effect of reducing frequency steps, expanding working bandwidth, and increasing output frequency.
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Embodiment 1
[0054] Embodiment 1: as figure 1 As shown, a broadband fine-step frequency synthesis circuit includes a reference unit, an intermediate frequency unit, a local oscillator unit, and a spread spectrum unit. The reference unit generates a low-noise reference signal and then inputs it to the intermediate frequency unit and the local oscillator unit. The intermediate frequency unit generates a broadband intermediate frequency The signal is realized in the local oscillator unit to output the low phase noise local oscillator signal, and the input end of the spread spectrum unit is connected to the output of the local oscillator unit and the output of the intermediate frequency unit.
[0055] This embodiment adopts comb line cascading and direct combination to realize low phase noise local oscillator; uses DDS+ phase-locked loop to realize fine-step broadband intermediate frequency; efficiently expands working bandwidth by means of frequency mixing, interpolation filling, frequency ban...
Embodiment 2
[0056] Embodiment 2: On the basis of Embodiment 1, the reference unit includes a first comb generator, a power divider, and a filter ,filter ; The low phase noise reference signal provided by the first comb generator input crystal oscillator , yielding a step of The low additional noise broadband comb spectrum signal, the comb spectrum signal is divided into two and passed through the filter respectively ,filter , to extract the first low-noise reference signal , the second low noise reference signal .
Embodiment 3
[0057] Embodiment 3: On the basis of Embodiment 1, the intermediate frequency unit includes a DDS, a phase detector, a loop filter, a voltage-controlled oscillator, and a directional coupler; the first low-noise reference signal Input DDS, select DDS low spurious performance section as the input of phase detector; phase detector, loop filter, voltage controlled oscillator and directional coupler constitute a phase locked loop, and the output signal generated by voltage controlled oscillator Prescaled in the phase detector, and the very fine step signal generated by DDS Real-time phase comparison to control the output frequency of the voltage-controlled oscillator; cooperate with the adjustment of DDS and PLL settings to generate low-spurious, fine-step broadband IF signals, and the IF coverage frequency band is .
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