High-Speed, Low-Power Sigma-Delta Modulators

caroline11

Recent efforts in the design of integrated circuits for RF communication transceivers have focussed on achieving higher levels of integration as well as adaptability to multiple RF communication standards. Direct conversion and wideband IF double-conversion receiver architectures increase integration because channel select filtering may be performed on chip at baseband. To achieve adaptability to multiple communication standards, programmable channel select filtering can be more easily performed in the digital domain. A sigma-delta modulator can achieve the wide dynamic range required to detect a desired channel in the presence of strong adjacent channel interferers.