INTERFERENCE REDUCTION TECHNIQUES FOR RECEIVERS.
Abstract
This report on Interference Reduction Techniques for Receivers, outlines the basic achievements during the first two-year period of this contract. During this period, equations were derived which can accurately predict the amount of cross- and intermodulation products in a receiver mixer or amplifier. These equations are valid for any interfering or signal levels. In addition, it was proven that a square-law device, when placed in an operating circuit, will not have a true square-law characteristic and, hence, will contain cross- and intermodulation products. Furthermore, devices such as an exponential mixer will, for a given signal and local oscillator level, have the same intermodulation distortion (within 1 db) as a near square-law device such as a mixer or parametric converter. It has also been shown theoretically and proven experimentally that intermodulation distortion is directly proportionate to signal levels. A 1-db decrease in signal level will decrease intermodulation distortion by 2 db, and cross-modulation distortion by 1 db. At the same time, it was shown that an increase in the local oscillator power of typical mixers, including resistive, point-contact, hot-carrier, varactor, and tunnel-diode, will increase the dynamic range by the same amount. The report contains a Highlights Section and also a systems evaluation of receiver performance. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 31, 1965
- Accession Number
- AD0475968
Entities
People
- B. Bossard
- B. Perlman
- L. Becker
- P. Torrione
- S. C. Yuan