Design of a Low-power Consumption VCO with Low Phase Noise and High Tuning Gain

In order to improve the performance of wireless communication systems and meet the growing demand for high transmission rates and large capacity, a low-power consumption voltage-controlled oscillator with low phase noise and high tuning gain based on the principle of negative resistance was designed and implemented. The VCO mainly consists of three parts: tuning network, transistor network and load network, including core devices such as silicon-based low-noise transistors and varactor. According to actual measurement, under the condition of supplying a 3 V power supply voltage and an adjustable voltage of 0 V~2.5 V, the frequency tuning range of the VCO is 3 348 MHz~3 523 MHz, the tuning gain is 70 MHz/V, the power consumption is 54 mW and the second harmonic suppression is approximately -35 dBc. When the output frequency is 3 416 MHz, the phase noise at the 10 kHz frequency offset is -83.85 dBc/Hz.