优化音频桥系杆负载放大器-Optimizing Audio
abstract: this audio bridge-tied load (btl) amplifier application note describes a unique architecture that minimizes the differential output distortion and noise (thd+n).
免费注册参加在线研讨会，学习如何分析、测量并最终解决音频系统的设计问题 (english only) 。
low-voltage systems driving loudspeakers often employ a bridged-amplifier configuration that effectively doubles the voltage swing at the transducer (speaker). in a typical bridge-amplifier circuit (figure 1), an ac-coupled inverting stage with gain drives one side of the speaker. it also drives a second unity-gain inverting amplifier, which drives the other side of the speaker.
figure 1. this conventional bridged amplifier features two amplifiers in tandem.
bridged amplifiers usually incorporate a matched pair of amplifiers, but the first amplifier dominates overall performance because its output noise and distortion are replicated in the second amplifier. you can eliminate this drawback by placing the two amplifiers in a non-cascaded configuration, in which one is inverting and the other in non-inverting (figure 2). both amplify the same input signal, so neither one reproduces noise, distortion, or clipping introduced by the other.
figure 2. this circuit optimizes the figure 1 configuration by apportioning gain between the two amplifiers.
as a key improvement in figure 2, dc bias for the non-inverting circuit is derived from the inverting amplifier's source resistor. (bias is required because the input is ac coupled). using the other amplifier's source resistor as a bias source lowers the component count and eliminates signal injection into the high-impedance bias source (vcc/2, applied to the top amplifier's non-inverting input).
another advantage in figure 2 is the elimination of dc gain in the non-inverting amplifier. for the circuit shown, c2 sets the -3db point at half the input cutoff frequency, and r1/c1 sets the input highpass cutoff frequency at 100hz.
a similar version of this article appeared in the november 19, 2001 issue of electronic design magazine.
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免费注册参加在线研讨会，学习如何分析、测量并最终解决音频系统的设计问题 (english only) 。
low-voltage systems driving loudspeakers often employ a bridged-amplifier configuration that effectively doubles the voltage swing at the transducer (speaker). in a typical bridge-amplifier circuit (figure 1), an ac-coupled inverting stage with gain drives one side of the speaker. it also drives a second unity-gain inverting amplifier, which drives the other side of the speaker.
figure 1. this conventional bridged amplifier features two amplifiers in tandem.
bridged amplifiers usually incorporate a matched pair of amplifiers, but the first amplifier dominates overall performance because its output noise and distortion are replicated in the second amplifier. you can eliminate this drawback by placing the two amplifiers in a non-cascaded configuration, in which one is inverting and the other in non-inverting (figure 2). both amplify the same input signal, so neither one reproduces noise, distortion, or clipping introduced by the other.
figure 2. this circuit optimizes the figure 1 configuration by apportioning gain between the two amplifiers.
as a key improvement in figure 2, dc bias for the non-inverting circuit is derived from the inverting amplifier's source resistor. (bias is required because the input is ac coupled). using the other amplifier's source resistor as a bias source lowers the component count and eliminates signal injection into the high-impedance bias source (vcc/2, applied to the top amplifier's non-inverting input).
another advantage in figure 2 is the elimination of dc gain in the non-inverting amplifier. for the circuit shown, c2 sets the -3db point at half the input cutoff frequency, and r1/c1 sets the input highpass cutoff frequency at 100hz.
a similar version of this article appeared in the november 19, 2001 issue of electronic design magazine.
如何利用Wi-Fi Halow技术构建智能、可持续的能源基础设施
4D毫米波雷达将在今年迎来爆发
压敏电阻器产品参数
LLC谐振网络电路原理图
“2019第二届传神者大会”在中国光谷隆重召开
优化音频桥系杆负载放大器-Optimizing Audio
为什么搜索引擎中有那么多无效链接？
三星S8太贵，小米6抢不到？一加5骁龙835运存8GB，才3000元不到？就选他了
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5g基站的工作原理 5g基站设备组成
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上海一家世界级半导体封测厂的突然关闭折射出什么？
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