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Title: Quadrature Mixer LO Leakage Suppression Through Quadrature DC Bias

A new concept has been developed which allows direct-to-RF conversion of digitally synthesized waveforms. The concept named Quadrature Error Corrected Digital Waveform Synthesis (QECDWS) employs quadrature amplitude and phase predistortion to the complex waveform to reduce the undesirable quadrature image. Another undesirable product of QECDWS-based RF conversion is the Local Oscillator (LO) leakage through the quadrature upconverter (mixer). A common technique for reducing this LO leakage is to apply a quadrature bias to the mixer I and Q inputs. This report analyzes this technique through theory, lab measurement, and data analysis for a candidate quadrature mixer for Synthetic Aperture Radar (SAR) applications.
Authors:
;
Publication Date:
OSTI Identifier:
800958
Report Number(s):
SAND2002-1316
TRN: US200224%%147
DOE Contract Number:
AC04-94AL85000
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 May 2002
Research Org:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org:
US Department of Energy (US)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; AMPLITUDES; DATA ANALYSIS; MIXERS; OSCILLATORS; QUADRATURES; RADAR; SYNTHESIS; WAVE FORMS