| 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.
|
