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1. 发明授权

US06208280B1 Converting a pulse-width modulation signal to an analog voltage 有权
标题翻译：将脉冲宽度调制信号转换为模拟电压
公开(公告)号：US06208280B1
公开(公告)日：2001-03-27
申请号：US09326172
申请日：1999-06-04
申请人： John M. Baker , Edward N. Jeffrey , Robert Whyte, Jr.
发明人： John M. Baker , Edward N. Jeffrey , Robert Whyte, Jr.
IPC分类号： H03M166
CPC分类号： H03M1/822
摘要： An apparatus and method for converting a pulse-width modulation (PWM) signal to an analog voltage signal. A current source is provided to supply electrical charge at a controllable rate to a ramp capacitor which, during successively occurring cycles of the PWM signal, alternatively receives electrical charge from the current source and discharges previously received electrical charge. A first sampling capacitor receives electrical charge from the ramp capacitor to output a feedback voltage to a feedback circuit to adjust the rate of electrical charge supplied by the current source, with the charge transferred to the first sampling capacitor determined in relation to the charge stored on the ramp capacitor over an entire PWM cycle. A second sampling capacitor receives electrical charge from the ramp capacitor to output the analog voltage, with the charge transferred to the second sampling capacitor determined in relation to the duty cycle of the PWM signal.
摘要翻译：一种用于将脉冲宽度调制（PWM）信号转换为模拟电压信号的装置和方法。提供电流源以向可变速率电容器提供电荷，斜坡电容器在连续发生的PWM信号周期期间可替代地从电流源接收电荷并放电先前接收到的电荷。第一采样电容器从斜坡电容器接收电荷以将反馈电压输出到反馈电路以调整由电流源提供的电荷的速率，其中转移到相对于存储的电荷确定的第一采样电容器的电荷整个PWM周期内的斜坡电容。第二采样电容器从斜坡电容器接收电荷以输出模拟电压，其中电荷转移到相对于PWM信号的占空比确定的第二采样电容器。

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