设计了一款单片高线性度低噪声宽带解调器。采用共基极输入吉尔伯特单元混频器结构实现宽带和高线性度特性,内部集成螺旋线圈变压器,实现单端向双端转换。电路采用0.18μmSiGe BiCMOS工艺技术,在2~4 GHz频段内实现宽带匹配,反射系数小于-10 dB,单边带噪声系数小于14 dB,输入1 dB压缩点大于10 dBm,相位误差小于1.5°,幅度误差小于0.5 dB。 Designed a monolithic high linearity low noise broadband demodulator. The common base input Gilbert cell mixer structure to achieve broadband and high linearity characteristics, the internal integrated spiral coil transformer, to achieve single-ended to double-ended conversion. The circuit uses 0.18μm SiGe BiCMOS process technology to achieve broadband matching in the frequency band of 2 to 4 GHz with a reflection coefficient of less than -10 dB, a single sideband noise coefficient of less than 14 dB, an input 1 dB compression point of more than 10 dBm, a phase error of less than 1.5 °, Amplitude error is less than 0.5 dB.