On the Direct Conversion Receiver
CX74017
On the Direct Conversion Receiver
Abstract
Increased pressure for low power, small form factor, low cost, and re...
Description
CX74017
On the Direct Conversion Receiver
Abstract
Increased pressure for low power, small form factor, low cost, and reduced bill of materials in such radio applications as mobile communications has driven academia and industry to resurrect the Direct Conversion Receiver (DCR). Long abandoned in favor of the mature superheterodyne receiver, direct conversion has emerged over the last decade or so thanks to improved semiconductor process technologies and astute design techniques. This paper describes the characteristics of the DCR and the issues it raises. brief description of alternative and well-established receiver architectures, this paper presents the direct conversion reception technique and highlights some of the system-level issues associated with DCR.
Traditional Reception Techniques
The Superheterodyne The superheterodyne, or more generally heterodyne1, receiver is the most widely used reception technique. This technique finds numerous applications from personal communication devices to radio and TV tuners, and has been tried inside out and is therefore well understood. It comes in a variety of combinations [7-9], but essentially relies on the same idea: the RF signal is first amplified in a frequency selective low-noise stage, then translated to a lower intermediate frequency (IF), with significant amplification and additional filtering, and finally downconverted to baseband either with a phase discriminatory or straight mixer, depending on the modulation format. ...
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