低增益变化宽线性范围低噪声压控振荡器设计

Design of Low Phase Noise Voltage Controlled Oscillator with Low Tuning-gain Change and Wide Linear Range

摘要: 应用 TSMC 0.18 μm CMOS工艺设计了一款低调谐增益变化，恒定调谐曲线间隔，恒定输出摆幅的低功耗低噪声宽带压控振荡器（Voltage Controlled Oscillator，VCO）.本振荡器的振荡频率覆盖1.153~1.911 GHz（49.5%）范围，相邻调谐曲线的覆盖范围大于50%，调谐增益变化范围为45.5~52.7 MHz/V（13.7%），相邻调谐曲线间距变化范围为43.2~45.9 MHz（5.9%），VCO输出波形的峰峰值为694~715 mV（3%），调谐曲线的线性范围为0.2~1.6 V（1.4 V）.在1.8 V的电源电压下，VCO在中心频率1.53 GHz处耗电电流为3.2 mA，相位噪声在1 MHz频偏处为-130.5 dBc/Hz，FOM值为-186.5 dBc/Hz.

Abstract: Based on 0.18 μm CMOS process, a low power low phase noise broadband VCO with low tuning-gain change constant tuning curve interval and constant output swing was presented. Switched capacitor array,varactor array with bias voltage and the tail current array was included in this VCO. The tuning range of VCO is 1.153~1.911 GHz(49.5%). The coverage of adjacent tuning curve is more than 50%. The tuning-gain of VCO is 45.5~52.7 MHz/V (13.7%). The space of adjacent tuning curve is 43.2~45.9 MHz(5.9%).The output swing of VCO is 694~715 mV(3%).The linear range of tuning curve is 0.2~1.6 V(1.4 V). At a 1.8 V supply and the center frequency 1.53 GHz, the VCO measures a phase noise of -130.5 dBc/Hz@1 MHz offset while dissipating 3.2 mA current. The FOM of the VCO is -186.5 dBc/Hz.