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基于SMIC 0.18μm 1P6M CMOS工艺,设计实现了一种工作在0.6 V超低电源电压下的混频器.该混频器跨导级采用自偏置的互补跨导结构,并与开关级构成折叠结构,大大降低了电源电压;电路中所有的MOS管衬底均加有固定偏置电压,减小了MOS管的阈值电压,实现了超低电压超低功耗的设计;并采用电流复用技术,改善了电路的噪声性能,并提高了其转换增益和线性度.该混频器核心电路尺寸为460μm×400μm,当射频信号、本振信号和中频信号分别为1575 MHz,1400 MHz和175 MHz时,仿真表明,该混频器转换增益(Gc)为6.1 dB,双边带噪声系数为14 dB,输入1 dB压缩点为-16.67 dBm,在0.6 V的电源电压条件下,功耗仅为0.76 mW,可用于航空航天领域的电子系统中.
Based on the SMIC 0.18μm 1P6M CMOS process, a mixer designed to operate at an ultra-low supply voltage of 0.6 V is proposed, which uses a self-biased complementary transconductance structure at the transconductance stage and is folded with the switching stage Structure, greatly reducing the power supply voltage; all the MOS tube substrate in the circuit are added a fixed bias voltage, reducing the threshold voltage MOS tube to achieve ultra-low voltage ultra-low power design; and the use of current multiplexing Technology to improve the noise performance of the circuit and improve its conversion gain and linearity.The mixer core circuit size of 460μm × 400μm, when the RF signal, the local oscillator signal and the IF signal were 1575MHz, 1400MHz and 175 MHz, the simulations show that the mixer has a conversion gain (Gc) of 6.1 dB, a double-sideband noise figure of 14 dB and an input 1 dB compression point of -16.67 dBm. At a supply voltage of 0.6 V, the power dissipation is only 0.76 mW, can be used in the field of aerospace electronic systems.