A 2.4 GHz CMOS sub-sampling mixer with integrated filtering
A 2.4 GHz CMOS sub-sampling mixer with integrated filtering
复制标题
具有集成滤波功能的 2.4 GHz CMOS 子采样混频器
DOI：
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发表时间：
2005
影响因子：
5.4
通讯作者：
J. Haslett
中科院分区：
文献类型：
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作者：
H. Pekau;J. Haslett
提出了一种子采样混频器，它将采样开关和保持电容器合并到 LNA 的并联谐振 LC 负载中。所提出的子采样混频器的噪声系数低于标准采样电路的噪声系数，因为所提出的混频器具有窄带增益和输入噪声滤波特性。提出了一种新颖的电平移位时钟缓冲器，具有快速上升和下降时间来驱动混频器采样开关。该混频器采用 0.18 /spl mu/m CMOS 工艺制造，测量结果为 2.42 GHz 的射频输入频率和 100 MHz 的采样频率。所提出的电路的测量噪声系数为 21.8 dB，与其他已发布的子采样混频器相比，性能有所提高。
A sub-sampling mixer that incorporates sampling switches and hold capacitors into the parallel resonant LC load of an LNA is proposed. The noise figure of the proposed sub-sampling mixer is lower than that of a standard sampling circuit because the proposed mixer has narrow-band gain and input noise filtering properties. A novel level-shifting clock buffer with fast rise and fall times to drive the mixer sampling switches is presented. The mixer was fabricated in a 0.18 /spl mu/m CMOS process and measured results are presented for an RF input frequency of 2.42 GHz and a sampling frequency of 100 MHz. With a measured noise figure of 21.8 dB, the proposed circuit shows improved performance compared to other published sub-sampling mixers.