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为了实现数字移动通信方式,需要研制适于用电池工作的小型化数字传输调制解调器本文介绍了一种采用数字信号处理(DSP)方式的高精度正交型GMSK调制器,由于在调制器上存在着因量化而产生的噪声叠加在调制频谱上,提出了一种可抑制该噪声的设计方法。另外,调制器用的双平衡混频器是采用G aA sFET构成的集成化结构。文中讨论和分析了由混频器等所产生的寄生特性。实现了在1千兆赫内,噪声和寄生抑制到很小的GMSK调制器。还采用了分频同步方式和CMOS IC方式,实现由数字电路构成的低功耗同步检波解调器,在实用上可得到非常优良的误码率特性。
In order to realize the digital mobile communication mode, it is necessary to develop a miniaturized digital transmission modem suitable for battery operation. In this paper, a high-precision quadrature GMSK modulator based on digital signal processing (DSP) is introduced. Because of the existence of The noise generated by quantization is superimposed on the modulation spectrum, and a design method for suppressing the noise is proposed. In addition, the dual-balanced mixer for modulators is an integrated structure using G aA sFETs. This paper discusses and analyzes the parasitic characteristics generated by mixer and so on. Achieving GMSK modulator with very little noise and parasitics within 1 gigahertz. Also adopted the frequency synchronization method and CMOS IC way to achieve by the digital circuit composed of low-power synchronous demodulation demodulator, in practice, can get very good bit error rate characteristics.