发明授权
US5917369A Pulse width modulator with automatic gain control over-voltage modulator
and limiter
失效
具有自动增益控制过压调制器和限幅器的脉宽调制器
- 专利标题： Pulse width modulator with automatic gain control over-voltage modulator and limiter
- 专利标题（中）： 具有自动增益控制过压调制器和限幅器的脉宽调制器
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申请号： US30626申请日： 1998-02-25
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公开(公告)号： US5917369A公开(公告)日： 1999-06-29
- 发明人: Huey Nguyen
- 申请人： Huey Nguyen
- 申请人地址： CA Santa Clara
- 专利权人： National Semiconductor Corporation
- 当前专利权人： National Semiconductor Corporation
- 当前专利权人地址： CA Santa Clara
- 主分类号： H03F3/217
- IPC分类号： H03F3/217 ; H03F3/38
摘要：
A pulse-width modulation (PWM) circuit in a Class D audio amplifier includes output-limiting logic and an automatic gain control (AGC) circuit. When an out-of-range, or overmodulated, input signal is received by the PWM, mono-stable multivibrator circuits provide discharge pulses that ensure that the PWM output will not spend excessive time in a single state. By using discrete mono-stable multivibrators, uniform and repeatable pulses can be generated at precise intervals. In addition, when an out-of-range input signal is detected, the AGC circuit lowers the gain on the input signal until it falls within the acceptable range of the PWM, enabling more faithful reproduction of the original signal.
公开/授权文献
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