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Signal processing system using delta-sigma modulation having an internal stabilizer path with direct output-to-integrator connection
Signal processing system using delta-sigma modulation having an internal stabilizer path with direct output-to-integrator connection
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机译:使用delta-sigma调制的信号处理系统,具有内部稳定器路径和直接的输出至积分器连接
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摘要
A signal processing system includes an analog-to-digital delta sigma modulator with a duty cycle modulator and a finite impulse response (FIR) filter in a main loop feedback path of the delta sigma modulator. The duty cycle modulator and FIR filter can provide high performance filtering in the main loop feedback path. To prevent instability in the main loop caused by the duty cycle modulator and FIR filter, the delta sigma modulator also includes a stabilizer loop. Transfer functions of the main loop and the stabilizer loop combine to achieve a target transfer function for the analog-to-digital delta sigma modulator that provides for stable operation of the analog-to-digital delta sigma modulator. In at least one embodiment, the stabilizer loop includes a stabilizer path that provides output data directly to an integrator of the main loop filter.
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