A reconfigurable low IF-zero IF receiver architecture for multi-standard wide area wireless networks

Systematic top-down design of reconfigurable ΣΔ modulators for multi-standard transceivers

“…This receiver architecture is commonly used in multi-standard applications because it eliminates the need for both IF and image-reject filtering and requires only a single oscillator and mixer [28]. In order to cope with the requirements of the different standards, separate (switchable) RF hardware paths (normally one per standard) are used whereas a single, digitally programmed baseband section (from the mixer to the ADC) is implemented [29].…”

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“…It is preferable to use Zero-IF architecture when dealing with systems that have wide channel bandwidth like UMTS-2100, because removing DC offset by using DC notch filter or AC coupling will not cause a significant damage [1]. The narrow channel bandwidth in GSM-1800 makes this architecture unattractive due to the removal of significant part of the signal when removing DC offset.…”

“…Our work, the design of a reconfigurable RF-FE receiver, has been the subject of many papers and dissertations around the world ( [1], [6], [8], [9] and [10]). In this section our motivation to do this work is expressed, and its novelty is highlighted when compared to other work.…”

“…The narrow channel bandwidth in GSM-1800 makes this architecture unattractive due to the removal of significant part of the signal when removing DC offset. Thus, using Zero-IF architecture is suitable for UMTS-2100 while using Low-IF architecture will be more suitable for GSM-1800 [1]. In order to reduce size and cost, a common RF-FE receiver that can be configured to operate as Zero-IF for UMTS-2100 and Low-IF for GSM-1800 was designed.…”

“…The simultaneous need for global roaming and all-in-one wireless phones has resulted in a demand for handsets which can receive multiple standards and meet the modern requirements of the wireless devices such as low cost, high integration and high performance [1].…”