Multiple-frequency-band low-phase-noise voltage-controlled oscillator and signal generating device

Abstract

The invention discloses a double-frequency-band low-phase-noise voltage-controlled oscillator and a signal generation device, and belongs to the technical field of circuit design, a coupling resonant cavity network comprises a first coupling resonator and a second coupling resonator, and the first coupling resonator and the second coupling resonator generate different resonant frequency signals under the control of tuning voltage; the emitter of the transistor is respectively connected to the output ends of the first coupled resonator and the second coupled resonator, and the transistor is used for amplifying the resonant frequency signal; and the broadband negative resistance network is connected with the base electrode of the transistor and is used for generating uniform or constant negative resistance on a tuning frequency band. The coupling resonant cavity network provides needed oscillation frequency, the negative resistance network is coupled with the base electrode of the transistor, the negative resistance value which uniformly changes in the whole transmission band is provided, and therefore it is guaranteed that the VCO can maintain stable oscillation in the whole S wave band, and meanwhile the good noise performance is kept.

Description

technical field [0001] The invention relates to the technical field of circuit design, in particular to a voltage-controlled oscillator and a signal generating device with an octave frequency band and low phase noise. Background technique [0002] Voltage Controlled Oscillator (VCO) refers to an oscillator circuit whose output frequency corresponds to the input control voltage. The size of the output signal depends on the design of the VCO circuit, and the operating frequency is determined by the resonator that provides the input signal; clock generation and clock Recovery circuits typically generate clocks using the VCO within a phase-locked loop (PLL) as an external reference, so the VCO is critical to the performance of the phase-locked loop. Phase-locked loops are especially important in wireless networks because they enable communication devices to quickly lock onto the carrier frequency on which communications are transmitted. [0003] The dynamic operating range and ...

AI Technical Summary

Problems solved by technology

[0005]1. From the perspective of tuning bandwidth, the existing LC resonator-based VCO has not yet had a tuning range that covers the entire S-band, while the YIG resonator-based VCO although It can achieve a wide tuning range, but the cost is high and the volume is large, which has certain disadvantages for today's miniaturization needs;

[0006]2. From the perspective of phase noise, the phase noise level of VCOs with wide bandwidth is generally around -80dBc / Hz@10kHz when they are working near the S-band. Noise level still needs to be improved

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