NARROW BAND TO BROADBAND 90 AND 180 DEGREES TRANSLATION ARCHITECTURES
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2002-Aug-27
During the last several years the necessity for improved synthesizer performance has become increasingly acute. In order to improve perfor- mance, designers have investigated the use of adap- tive architectures to improve phase noise perfor- mance, settling time and spurious generation. In view of this, synthesizer architectures have evolved into muti-loop designs depending upon mixers for signal insertion and frequency control. In support of the foregoing, circuit techniques employing Single Side Band Generator (SSBG) have been adopted by synthesizer architectures to enhance spurious perfor- mance. The primary attribute for improving spuri- ous performance using this vehicle is the SSBG ability to select either upper or lower sidebands to circumvent in band spurious products. The prob- lems normally encountered regarding the aforemen- tioned are; complex circuit topologies, limited band- width and increased cost / circuit size.