公开(公告)号：WO1995033305A1

公开(公告)日：1995-12-07

申请号：PCT/US1995005691

申请日：1995-05-05

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  STENGEL, Robert, S. ,  MURI, David, L. ,  FERRER, Enrique

IPC: H03F03/38

CPC classification number: H03F3/2173

Abstract: An amplifier (1) used with a pulse width modulated signal which improves the efficiency of a low level input signal comprises two or more switching devices (7, 9) with common source/drain or emitter/collector connections. The gates or the bases of the devices are independently driven to optimize the efficiency of the various Rds (on) resistance values of the transistors (61, 63, 65, 89, 91, 93) used in the devices. The amplifier is operated so that during the highest output levels, select switching devices (61, 63, 65) are utilized to reduce in series resistance with the load (13). As output power decreases, devices (89, 91, 93) with higher Rds (on) resistance values are activated by a control signal which greatly improves DC to DC conversion efficiency with improved output voltage resolution, dynamic range and reduced electromagnetic interference potential.

Abstract translation: 与提高低电平输入信号的效率的脉冲宽度调制信号一起使用的放大器（1）包括具有公共源极/漏极或发射极/集电极连接的两个或多个开关器件（7,9）。 独立地驱动器件的栅极或基极，以优化器件中使用的晶体管（61,63,65,89,91,93）的各种Rds（导通）电阻值的效率。 放大器的工作原理是，在最高的输出电平下，选择开关器件（61,63,65）来减少负载（13）的串联电阻。 随着输出功率的降低，具有较高Rds（on）电阻值的器件（89,91,93）由控制信号激活，通过改进的输出电压分辨率，动态范围和降低的电磁干扰电位，极大地提高了DC至DC转换效率。