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A 184 mW Fully Integrated DVB-H Tuner With a Linearized Variable Gain LNA and Quadrature Mixers Using Cross-Coupled Transconductor
采用0.5μm SiGe BiCMOS工艺实现的全集成DVB-H调谐器，具有线性化VG-LNA和混频器技术。
0.5μm SiGe BiCMOS, 184mW功耗, VG-LNA增益范围>50dB, NF<2.6dB(200-1000MHz), IIP3>10dBm@2.1mA, 混频器OIP3>25dBm@5mA
DVB-H调谐器全集成线性化技术SiGe BiCMOS低功耗
▸创新点1：线性化可变增益低噪声放大器(VG-LNA)采用新颖的线性化技术，在0.5-μm SiGe BiCMOS工艺下实现超过50 dB的可变增益范围，噪声系数低于2.6 dB（200-1000 MHz频段），IIP3超过10 dBm，功耗仅2.1 mA。该设计通过创新的反馈结构解决了增益变化与线性度的矛盾，属于电路级创新。
▸创新点2：线性化正交混频器通过独特的线性化技术，在5 mA电流消耗下实现OIP3超过25 dBm的高线性度表现。该设计优化了混频器的跨导级和开关级结构，显著提升了直接转换架构的线性性能，属于方法创新与电路创新的结合。
▸创新点3：新型基带偏移消除反馈技术通过创新的反馈环路设计，使高通截止频率独立于基带可变增益放大器(VGA)的增益变化，解决了传统DCR架构中增益依赖性问题。该技术属于系统级创新，直接提升了接收机的稳定性和抗干扰能力。
▸创新点4：整体系统集成创新，在184 mW总功耗下实现完全集成的DVB-H调谐器，满足所有DVB-H标准要求。通过协同优化LNA、混频器和基带模块，证明了低功耗与高线性度在单芯片上的可行性，属于系统级架构创新。
Abstract
A fully integrated direct conversion DVB-H tuner is realized in a 0.5- m SiGe BiCMOS technology. To meet the strin- gent linearity requirement while keeping low power consumption, novel linearization techniques for a variable-gain low-noise ampli- fier (VG-LNA) and a mixer are proposed. The proposed linearized VG-LNA has a variable gain range of over 50 dB, noise figure of less than 2.6 dB over the frequency range from 200 to 1000 MHz, and IIP3 of more than 10 dBm at a current consumption of 2.1 mA. The quadrature mixer with the proposed linearization technique achieves OIP3 of more than 25 dBm at a current consumption of 5 mA. In addition, a new offset-cancel feedback is introduced for the baseband block of a direct conversion receiver, which keeps the high-pass cutoff frequency independent of the baseband VGA gain. The fabricated tuner IC satisfies all the DVB-H requirements at a power consumption of 184 mW.