Title :
DC offsets in direct-conversion receivers: characterization and implications
Author :
Svitek, R. ; Raman, S.
Author_Institution :
Wireless Microsystems Lab., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
Abstract :
Since DC-offsets can have a large, negative impact on the performance of direct-conversion receivers, it is important to determine the offset performance of a given design. This article discusses one technique that can be used to characterize and measure dc-offsets in DCR circuit applications. DC-offsets are a primary concern in the design of DCRs and must be characterized in determining the performance of a particular receiver design. By measuring the dc level at the output of a DCR front-end in separate steps, the source of the offsets - device mismatches, LO self-mixing, and second order nonlinearities - can be resolved.
Keywords :
demodulation; frequency convertors; frequency modulation; microwave integrated circuits; microwave receivers; radio receivers; DC offsets; DCR circuit applications; demodulation; direct conversion receivers; frequency convertors; frequency modulation; microwave integrated circuits; microwave receivers; radio receivers; Application specific integrated circuits; Bandwidth; Baseband; Circuit topology; Filtering; Low pass filters; Low-noise amplifiers; Matched filters; RF signals; Radio frequency;
Journal_Title :
Microwave Magazine, IEEE
DOI :
10.1109/MMW.2005.1511916
