CN201210375535
CN102904590A
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摘要:中频双路径前馈型带通调制器,属于中频数字通信领域,本发明为解决现有中频前馈型sigma-delta带通调制器时钟频率高、功耗大,难以满足系统低功耗要求的问题。本发明调制器由两级双路径谐振器单元、求和电路单元、比较器单元、选择器单元、正、反一位DAC反馈单元组成,系统输入信号和反馈信号的差值经过两级谐振器滤波,与系统输入信号、第一级双路径谐振器单元输出信号求和,求和电路输出经过比较器进行量化,量化的结果反馈到正、反一位DAC反馈单元,由正、反一位DAC反馈单元和时钟信号决定反馈给第一级双路径谐振器单元的反馈电压,实现输出信号位流跟踪系统输入信号变化。适合于中频数字接收机中的高性能带通调制器电路。
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Abstract: The invention relates to a medium-frequency, double-path and feed-forward type band-pass modulator, which belongs to the field of the medium-frequency digital communication. The band-pass modulator solves the problem that the existing medium-frequency and feed-forward type sigma-delta band-pass modulator is high in clock frequency and large in power consumption so as not to meet the low power consumption requirement of the system. The modulator consists of a two-stage double-path resonator unit, a summing circuit unit, a comparator unit, a selector unit, a positive one-bit DAC (digital-to-analog converter) feedback unit and a negative one-bit DAC (digital-to-analog converter) feedback unit, wherein the difference of an input signal and a feedback signal of the system is filtered by the two stages of resonators; and then the difference is summed with the input signal of the system and the output signal of the first-stage double-path resonator unit; the output of the summing circuit is quantized by the comparator; the quantized result is fed back to the positive one-bit DAC feedback unit and the negative one-bit DAC feedback unit; the feedback voltage fed back to the first-stage double-path resonator unit is determined by the positive one-bit DAC feedback unit, the negative one-bit DAC feedback unit and the clock signal so as to realize the input signal variation of the output signal bit stream tracking system. The modulator is suitable for the high-performance band-pass modulator circuit in a medium-frequency digital receiver.
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申请人: 哈尔滨工业大学
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Applicant: HARBIN INST OF TECHNOLOGY
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地址: 150000 黑龙江省哈尔滨市南********(隐藏)
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发明(设计)人: 刘晓为 徐宏林 尹亮 吕炳均 付强 高志强 张蕊
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Inventor: LIU XIAOWEI; XU HONGLIN; YIN LIANG; LV BINGJUN; FU QIANG; GAO ZHIQIANG; ZHANG RUI
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主分类号: H04B1/16(2006.01)I
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分类号: H04B1/16(2006.01)I H04B1/00(2006.01)I
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