A mixed analog-digital secondary channel FSK modem

IEEE International Solid-State Circuits Conference, 1989 ISSCC. Digest of Technical Papers Pub Date : 1989-02-15 DOI:10.1109/ISSCC.1989.48284

C. Chen, E. Huang, B. White

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Abstract

The authors describe a fully integrated circuit that performs the functions of a 75-b/s narrowband FSK (frequency-shift-keying) modem, along with the necessary filtering functions to provide greater than 30-dB channel separation between FSK and QAM (quadrature amplitude-modulation) signals. Switched-capacity circuits are used extensively to implement the QAM filters and the FSK transmitter, and a reduced-instruction-set digital signal processor is employed to realize the FSK receiver. An important aspect of the digital filters realized on the chip is that each multiplier coefficient is optimized to have fewer than three nonzero bits in the signed-digit representation. With layout precautions and separate bonding pads for voltage supplies, the crosstalk between QAM and FSK signals and the coupling of the signal processor switching noise into analog signals are minimized. Less than 0.5 dB performance degradation of signal-to-noise ratio with 10/sup -6/ bit-error rate is introduced for 19.2-kb/s modems. The chip is fabricated with a 3- mu m, double-polysilicon, single-metal, p-well CMOS process.<>

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混合模拟-数字副通道FSK调制解调器

作者描述了一个完全集成的电路，它执行75-b/s窄带FSK(频移键控)调制解调器的功能，以及必要的滤波功能，以提供FSK和QAM(正交调幅)信号之间大于30 db的信道间隔。QAM滤波器和FSK发射机广泛采用交换容量电路，FSK接收机采用精简指令集数字信号处理器。在芯片上实现的数字滤波器的一个重要方面是，每个乘法器系数被优化为在符号数字表示中具有少于三个非零位。通过布局注意事项和电压电源的单独键合垫，QAM和FSK信号之间的串扰以及信号处理器切换噪声到模拟信号的耦合被最小化。对于19.2 kb/s的调制解调器，在10/sup -6/误码率下，信噪比的性能下降小于0.5 dB。该芯片采用3 μ m、双多晶硅、单金属、p阱CMOS工艺制造。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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IEEE International Solid-State Circuits Conference, 1989 ISSCC. Digest of Technical Papers

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