系统工程与电子技术
繫統工程與電子技術
계통공정여전자기술
SYSTEMS ENGINEERING AND ELECTRONICS
2014年
4期
630-636
,共7页
樊养余%于泽琦%袁永金%吕国云
樊養餘%于澤琦%袁永金%呂國雲
번양여%우택기%원영금%려국운
D类功放%控制器%预校正%均匀脉冲宽度调制%现场可编程门阵列
D類功放%控製器%預校正%均勻脈遲寬度調製%現場可編程門陣列
D류공방%공제기%예교정%균균맥충관도조제%현장가편정문진렬
class D power amplifier%controller%pre-correction%uniform pulse width modulation (UP-WM)%field programmable gate array (FPGA)
针对高性能音频 D 类功放系统,基于现场可编程门阵列(field programmable gate array,FPGA)设计,实现了一个双声道均匀脉冲宽度调制(uniform pulse width modulation,UPWM)型 D 类功放控制器。该控制器使用由相同子滤波器抽头级联构成的半带滤波器并时分复用乘法器,以降低可配置插值滤波器的硬件资源消耗,利用 sigma-delta 调制器的高开环增益,通过构造一个基于查找表的误差校正模块,以较小的硬件代价来预校正控制器使用 UPWM 技术在信号带宽内所带来的非线性失真。测试结果表明该控制器输出信噪比可达114 dB,互调失真仅为-97 dB。
針對高性能音頻 D 類功放繫統,基于現場可編程門陣列(field programmable gate array,FPGA)設計,實現瞭一箇雙聲道均勻脈遲寬度調製(uniform pulse width modulation,UPWM)型 D 類功放控製器。該控製器使用由相同子濾波器抽頭級聯構成的半帶濾波器併時分複用乘法器,以降低可配置插值濾波器的硬件資源消耗,利用 sigma-delta 調製器的高開環增益,通過構造一箇基于查找錶的誤差校正模塊,以較小的硬件代價來預校正控製器使用 UPWM 技術在信號帶寬內所帶來的非線性失真。測試結果錶明該控製器輸齣信譟比可達114 dB,互調失真僅為-97 dB。
침대고성능음빈 D 류공방계통,기우현장가편정문진렬(field programmable gate array,FPGA)설계,실현료일개쌍성도균균맥충관도조제(uniform pulse width modulation,UPWM)형 D 류공방공제기。해공제기사용유상동자려파기추두급련구성적반대려파기병시분복용승법기,이강저가배치삽치려파기적경건자원소모,이용 sigma-delta 조제기적고개배증익,통과구조일개기우사조표적오차교정모괴,이교소적경건대개래예교정공제기사용 UPWM 기술재신호대관내소대래적비선성실진。측시결과표명해공제기수출신조비가체114 dB,호조실진부위-97 dB。
Based on the field programmable gate array (FPGA),a 2-channel uniform pulse width modula-tion (UPWM)controller for high performance class D audio power amplifier systems is designed and implemen-ted.To reduce the consumption of hardware resources,half-band filters,designed as a tapped cascaded inter-connection of identical sub-filters,and time division multiplexing for multiplier are employed in the configurable interpolation filter.A look-up table error correction module with low hardware requirements,taking advan-tage of the high open loop gain of the sigma-delta modulator,is implemented to pre-correct the UPWM non-linear distortion in baseband.The test results indicate that the controller achieves 114 dB signal-to-noise ratio and -97 dB inter-modulation distortion.