发明名称 |
Pulsewidth-modulated amplifier having analog mode |
摘要 |
An audio amplifier (100) switches between a pulsewidth-modulated (PWM) mode to an analog mode when required in order to reduce unwanted EMI when the signals being reproduced fall within a predetermined threshold range such as when reproducing low amplitude signals. Amplifier (100) includes both a pulsewidth-modulator (114) and a low-level analog amplifier (126) coupled to a speaker bridge circuit. When controller (106) determines that the input signal (102) is at a predetermined level, controller (106) selectively applies to the load (164) an analog signal instead of the PWM signal, this provides for improved dynamic range and reduced amplifier produced EMI.
|
申请公布号 |
US5382915(A) |
申请公布日期 |
1995.01.17 |
申请号 |
US19930085900 |
申请日期 |
1993.07.06 |
申请人 |
MOTOROLA, INC. |
发明人 |
MURI, DAVID L.;STENGEL, ROBERT E. |
分类号 |
H03F3/217;(IPC1-7):H03K11/00;H03C7/00;H03K7/00 |
主分类号 |
H03F3/217 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|