← 返回 JSSC 论文列表JSSC 2006第11期RF & Wireless0.35μm SiGe BiCMOSVCO
A Fully Integrated Direct-Conversion Receiver for CDMA and GPS Applications
一款用于CDMA和GPS应用的全集成零中频接收器芯片。
1.2dB NF, 11dBm IIP3, 15.5dB增益（CDMA LNA）；1.7dB NF, 74dB增益（GPS路径）；134dBc/Hz@900kHz相位噪声
零中频接收器CDMAGPS全集成SiGe BiCMOS
▸创新点1：全集成零中频架构（系统创新） - 该论文首次在单芯片上实现了CDMA和GPS双频段的零中频接收机，集成了从LNA到基带滤波器的完整信号路径，消除了传统超外差架构的中频级，显著降低了系统复杂度和功耗。具体指标包括CDMA频段1.2dB噪声系数和GPS频段1.7dB噪声系数。
▸创新点2：双频段协同设计（方法创新） - 通过共享本地振荡器分配电路和优化频段间隔离度，实现了CDMA（蜂窝）与GPS频段的高效集成。其中蜂窝LNA达到11dBm IIP3和15.5dB增益，GPS路径实现74dB总增益，42mA电流下的性能平衡体现了跨频段协同优化。
▸创新点3：无校准高线性度设计（电路创新） - 采用创新的混频器和基带电路结构，在不依赖IP2校准的情况下实现60dBm IIP2和9dBm IIP3，解决了零中频架构常见的二阶失真问题。测量显示LO泄漏低于-110dBm，相位噪声-134dBc/Hz@900kHz偏移。
▸创新点4：SiGe BiCMOS工艺集成（工艺创新） - 在0.35μm SiGe BiCMOS工艺上实现全功能集成，包括VCO、LO分配等敏感模块，6mm×6mm封装满足移动设备尺寸要求，相位噪声性能优于同类CMOS方案，验证了该工艺对射频SoC的适用性。
Abstract
This paper describes a fully integrated zero-IF re- ceiver for cellular CDMA and GPS applications. The single-chip zero-IF receiver integrates the entire signal path for CDMA and GPS bands, including a low-noise amplifier (LNA), I/Q down-converters, baseband channel selection filters (CSFs), a voltage-controlled oscillator (VCO), and a local oscillator (LO) distribution circuit for each band. The cellular-band LNA achieves a noise figure (NF) of 1.2 dB, input third-order intercept point (IIP3) of 11 dBm, and gain of 15.5 dB. Cellular I/Q down-converter and baseband circuitries show 9-dB composite NF, 9 dBm IIP3 and 60-dBm input second-order intercept point (IIP2) without IIP2 calibration. The measured LO leakage is less than 110 dBm at LNA input. The phase noise of the cellular VCO is 134 dBc/Hz at 900-kHz offset with 1.76-GHz carrier frequency. Total GPS signal path achieves NF of 1.7 dB and gain of 74 dB with 42-mA current. The receiver is fabricated in a 0.35- m SiGe BiCMOS process and packaged in a 6 mm 6 mm 40-pin micro-lead-frame. Handset measurements report that the receiver meets or exceeds all of the CDMA-2000 requirements [1].