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1. 发明授权

US5617058A Digital signal processing for linearization of small input signals to a tri-state power switch 失效
标题翻译：数字信号处理，用于将小输入信号线性化到三态电源开关
公开(公告)号：US5617058A
公开(公告)日：1997-04-01
申请号：US556615
申请日：1995-11-13
申请人： Andrew A. Adrian , Michael S. Danielson , David B. Meyers , Leo Spiegel
发明人： Andrew A. Adrian , Michael S. Danielson , David B. Meyers , Leo Spiegel
IPC分类号： H03F1/32 , H03F3/217 , H03F3/38
CPC分类号： H03F1/3264 , H03F3/217 , H03F2200/331
摘要： An all digital switching amplifier wherein linearization of the power switch is accomplished solely by using three states. A small, fixed width, bi-state compensating carrier waveform is added to the leading or training edges of an oversampled main input pulse producing a compensated composite waveform. This compensating carrier linearizes output from a power switch by effecting common mode cancellation of switch time errors. Output pulse width combinations for the compensating carrier are obtained from a look-up table stored in memory. A correction mechanism is implemented to correct for harmonic distortion that is dependent on the modulation level or index and results from the compensating carrier modulation. The correction mechanism applies the inverse of the modulation induced distortion to the oversampled compensated composite input signal to null distortion products resulting from the modulation scheme used to apply the small carrier to linearize the performance of the tri-state power switch. Digital timing control of the power switch's deadband ensures accuracy of the timing and sequence in which individual switches within the power switch H-bridge are turned off and turned on, so as to preclude a short circuit across the power supply. A high speed clock used in linearizing the power switch provides a timing reference to generate the necessary deadband timing delays and pulse width increments. The output bridge uses enhancement mode MOSFETs.
摘要翻译：一种全数字开关放大器，其中功率开关的线性化仅通过使用三种状态完成。将小的，固定宽度的双态补偿载波波形添加到过采样主输入脉冲的前沿或训练边缘，产生补偿复合波形。该补偿载波通过实现共模消除开关时间误差来线性化电力开关的输出。用于补偿载体的输出脉冲宽度组合从存储在存储器中的查找表获得。执行校正机制来校正取决于调制电平或指标的谐波失真以及来自补偿载波调制的结果。校正机制将调制诱发失真的逆向应用于过采样补偿复合输入信号，由用于应用小载波的调制方案产生的零失真产物使三态功率开关的性能线性化。电源开关死区的数字定时控制可确保电源开关H桥内的各个开关关断和接通的时序和顺序的精度，以防止电源短路。用于线性化功率开关的高速时钟提供定时参考，以产生必要的死区定时延迟和脉冲宽度增量。输出桥使用增强型MOSFET。

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