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Apparatus Comprising a Sigma-Delta Modulator and Method of Generating a Quantized Signal-Delta Modulator
Apparatus Comprising a Sigma-Delta Modulator and Method of Generating a Quantized Signal-Delta Modulator
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机译:包括西格玛-德尔塔调制器的设备和生成量化信号-德耳塔调制器的方法
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摘要
A method of generating a quantized signal in a Sigma-Delta modulator (25) comprises the steps of feeding a modulator input signal to a quantizer (15) via at least one integrator (12, 13); generating in the quantizer (15) a quantized signal; feeding back the quantized signal to be subtracted from the modulator input signal; and generating a dither signal to be applied to a point in the Sigma-Delta modulator. The dither signal is applied to a selected one of a number of different points (11, 14) in the Sigma-Delta modulator (25) in dependence of a control signal. In this way a method of generating a quantized signal in a Sigma-Delta modulator is provided which provides optimal results for different modes of the application, such as phase modulation mode and frequency modulation mode in a Bluetooth receiver.
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