首页>
外国专利>
METHOD AND APPARATUS FOR PERFORMANCE IMPROVEMENT BY QUALIFYING PULSES IN AN OVERSAMPLED, NOISE-SHAPING SIGNAL PROCESSOR
METHOD AND APPARATUS FOR PERFORMANCE IMPROVEMENT BY QUALIFYING PULSES IN AN OVERSAMPLED, NOISE-SHAPING SIGNAL PROCESSOR
展开▼
机译:通过量化脉冲噪声信号处理器中的脉冲来改善性能的方法和装置
展开▼
页面导航
摘要
著录项
相似文献
摘要
The transition time of power switching devices ultimately limits the rate at which such devices can be switched. Because the occurrence of unacceptably narrow pulses is relatively rare in an oversampled, noise-shaping signal processor, the elimination of such narrow pulses is introduced through the use of circuitry in the modulator loop which constrains the time between transitions to be greater than or equal to some minimum time period which, in turn provides for a smooth interface to power switching devices. However, because of the delay introduced by this pulse qualification circuitry, the modulator loop sampling frequency is increased to deal with any resulting instability. Thus, an oversampled, noise shaping signal processor is described having at least one integrator stage in a feedback loop. A sampling stage in the feedback loop is coupled to the at least one integrator stage. The sampling stage samples an analog signal at a sample frequency. Qualification logic coupled to the sampling stage receives a pulse waveform therefrom, and ensures that signal transitions in the pulse waveform occur more than a first time period apart and that the waveform can therefore be handled by, for example, a power switching device. A switching stage in the feedback loop is coupled to the qualification logic. The signal processor has a feedback path from the output of the switching stage to the input of the at least one integrator stage thereby closing the feedback loop.
展开▼