REXROTH电子放大器#REXROTH功率放大器#REXROTH比例放大器
德国REXROTH放大器能把输入讯号的电压或功率放大的装置,REXROTH放大器由电子管或晶体管、电源变压器和其他电器元件组成。REXROTH放大器用在通讯、广播、雷达、电视、自动控制等各种装置中。
REXROTH放大器的原理: 高频功率放大器用于发射机的末级,作用是将高频已调波信号进行功率放大,以满足发送功率的要求,然后经过天线将其辐射到空间,保证在一定区域内的接收机可以接收到满意的信号电平,并且不干扰相邻信道的通信。
REXROTH放大器高频功率放大器是通信系统中发送装置的重要组件。按其工作频带的宽窄划分为窄带高频功率放大器和宽带高频功率放大器两种,窄带高频功率放大器通常以具有选频滤波作用的选频电路作为输出回路,故又称为调谐功率放大器或谐振功率放大器;宽带高频功率放大器的输出电路则是传输线变压器或其他宽带匹配电路,因此又称为非调谐功率放大器。高频功率放大器是一种能量转换器件,它将电源供给的直流能量转换成为高频交流输出在
“低频电子线路"课程中已知,放大器可以按照电流导通角的不同,将其分为甲、乙、丙三类工作状态。甲类放大器电流的流通角为360o,适用于小信号低功率放大。乙类放大器电流的流通角约等于
180o;丙类放大器电流的流通角则小于180o。乙类和丙类都适用于大功率工作丙类工作状态的输出功率和效率是三种工作状态中zui高者。高频功率放大器大多工作于丙类。但丙类放大器的电流波形失真太大,因而不能用于低频功率放大,只能用于采用调谐回路作为负载的谐振功率放大。由于调谐回路具有滤波能力,回路电流与电压仍然极近于正弦波形,失真很小。
力士乐放大器所产生的直流误差使失调和失调漂移降到zui低。在-40℃~+125℃温度范围内,它具有10μVzui大输入失调电压和65
nV/℃zui大输入失调电压漂移。DIGIN是单线串行接口,通过它对放大器的增益和输出失调进行调整设置,增益调整范围是70~1280,二级放大器的增益可以分别单独进行设置和调整,调整到预定的增益值后,再利用DigiTrim多晶硅熔丝技术固定放大器的增益设置,实现增益*设定。*级增益调整通过调整Pl和P2的128步7bit编码进行,范围为4.00~6.40;第二级增益调整通过调整P3和P4的8步3
bit编码,范围为17.5~200。在*性固定放大器的增益设定值之前,为获得*校准精度,可暂时在路设置和反复调节调整值。*级增益与编码值的关系见公式(1);第二级增益与编码值的关系如表l所列,放大器总增益GAlN=CAIN1xGAIN2。放大器的输出电压VOUT可由公式(3)算出,其中GAIN为电路对于差分输入的默认内部初始增益,大小为70。当2个输入都接地时,因*项接近0
V或zui大10 mV(由于输入放大器误差),这时电路的输出电压VOUT等于VDAC。
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REXROTH电子放大器#REXROTH功率放大器#REXROTH比例放大器
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