一种超低压超低耗NMOS衬底偏置混频器

使用两对NMOS管和衬底偏置技术,采用SMIC 0.18μm CMOS工艺,为卫星导航双系统兼容接收机的射频集成电路芯片设计了一种超低压、超低耗NMOS衬底偏置混频器(NBBM,NMOS Bulk-Biased Mixer).以其中的GPS系统为例:射频信号、本振信号和中频信号分别为1575.42MHz,1570MHz和5.42MHz.测试表明:在1V电源电压下,驱动差分负载阻抗1000Ω时,混频器消耗电流约为1.37mA,变频增益( G_C )超过2.11dB,输入1dB压缩点( P _in-1dB)约为-13dBm;若加入运放驱动,变频增益可超过14dB,但会带来线性度的降低、功耗以及面积的增加.

Ultra-low voltage ultra-low power NMOS bulk-biased mixer

By using two pairs of NMOSs and the bulk-biased technology, an ultra-low voltage ultra-low power NMOS bulk-biased mixer ( NBBM ) , applied to some satellite navigation dual-system compatible receiv-er, was implemented in SMIC 0. 18 μm CMOS process. The GPS system was included; the frequency of the radio frequency ( RF) signal, local oscillator ( LO) signal and the intermediate frequency ( IF) signal is 1 575. 42 MHz, 1 570 MHz and 5. 42 MHz, respectively. Measurement results show that the circuit with the re-sistive 1 000 Ω, termination consumes approximate 1. 37 mA under the supply voltage of 1 V, the conversion gain ( G_c) is higher than 2. 11 dB, and the input 1 dB compression point (P_(in-1 dB)) is about - 13dBm. For the mixer including operational amplifiers G_c can rise to more than 14dB, which comes along with the worse line-arity , more power consumption and larger area.