A fully integrated BiCMOS continuous-time filter for video signal processing applications is presented. It incorporates an input clamping circuit, a third-order equalizer, a fifth-order elliptic filter with sinx/x correction, and a 75-/spl Omega/ driver. The architectures of the input and output amplifiers as well as the filter and the equalizer are chosen based on the extensive study of circuit structures and Monte Carlo simulation to meet the linearity requirement for the broadcast-quality video system. The complete chip achieves a low-pass filter response with a 5.5-MHz cutoff frequency (f/sub cc/), 0.3-dB passband ripple, 20-ns group delay variation up to 0.9 f/sub c/, and 43-dB attenuation at 1.45 f/sub c/. With a nominal 2-Vpp signal at the output, measured results show 0.2% differential gain, 0.38/spl deg/ differential phase, and 1.7-mV rms noise demonstrating 10-bit linearity in a 1.5-/spl mu/m 4-GHz BiCMOS process technology. The filter active area is 8 mm/sup 2/ and it dissipates 350 mW in a single 5-V power supply.
展开▼
机译：提出了一种用于视频信号处理应用的完全集成的BiCMOS连续时间滤波器。它包含一个输入钳位电路，一个三阶均衡器，一个具有sinx / x校正的五阶椭圆滤波器和一个75- / spl Omega /驱动器。基于对电路结构和蒙特卡洛模拟的广泛研究，选择了输入和输出放大器以及滤波器和均衡器的体系结构，以满足广播质量视频系统的线性要求。完整的芯片可实现低通滤波器响应，具有5.5 MHz的截止频率（f / sub cc /），0.3 dB的通带纹波，20 ns的群延迟变化（最高0.9 f / sub c /）和43 dB衰减为1.45 f / sub c /。在输出具有标称2Vpp信号的情况下，测量结果显示0.2％的差分增益，0.38 / spl度/差分相位和1.7mV rms噪声，表明在1.5- / spl mu / m 4-GHz时具有10位线性度BiCMOS工艺技术。滤波器的有效面积为8 mm / sup 2 /，并且在单个5V电源中耗散350 mW。
展开▼
