ΣΔ Modulator Flexibility
In this chapter it will be investigated if a ΣΔ modulator can be made scalable to fit into a multi-standard radio. Goal is to come to a scaling method with which a ΣΔ modulator IP block can be designed, which can cope with any standard currently known. Once such an IP block is available, it can serve multiple receiver applications. The same ΣΔ modulator can be used for different receivers with different combinations of modes, e.g. a GSM, Bluetooth and GPS receiver, or a UMTS and WLAN receiver. Such a multi-mode ΣΔ modulator not only enables multi-mode receiver architectures but also leads to faster market introduction of receiver systems, as exactly the same ADC can be re-used in different products. The scalability of the loop filter, DAC and quantizer is reviewed.
KeywordsPhase Noise Clock Generator Clock Frequency Local Oscil High Sample Frequency
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