基于低电源电压混频器的设计

The Design of Mixer Based on Low Voltage Supply Circuit

提出了一种适用于低电源电压应用的混频器,其核心部分采用开关跨导形式,使得开关器件导通时的有限开态电阻引起的电压降减小到零,并在输出端采用折叠级联输出,降低了负载电阻引起的直流电压降,达到了在低电源电压下应用的目的.在1.3 V的电源电压下,电路仿真结果显示:转换增益为-11.5 dB,噪声系数为20.648 dBm,1 dB压缩点为-5.764 dBm,三阶交调失真点为4.807 dBm.

We designed a kind of mixer for the low voltage supply circuit. The core of this mixer was a version of switched transconductor. By doing this, the reduction of the voltage induced by finite on-resistance of the switch devices was reduced to almost zero. In the output-terminal, we took a version of folded-output, reducing the fall of the direct voltage caused by the load resistance, and finally achieved the purpose for the low volt-age supply circuit. Simulation results of this circuit on the condition of 1.3 V voltage supply showed that the conversion gain was - 11.5 dB, the noise figure was 20. 648 dBm, the 1 dB gain compression input power level was -5.764 dBm, and the IIP3 was 4.807 dBm.