Distortion Reduction in Amplifiers
Abstract
In order to cause no interference to reception, the harmonic and intermodulation distortion produced in a receiver multicoupler must be below the noise level of the receivers. This means that the distortion must be below a level of about one microvolt, regardless of input-signal amplitude. Several methods of reducing distortion in broadband amplifiers have been investigated with the aim of obtaining the desired reduction in distortion. These include push-pull operation, operation at a point of minimum distortion, and the use of feedback. Push-pull operation can be used to reduce even-order distortion by 20 to 30 db or more if the circuit is carefully balanced, but it alone is not capable of producing the desired freedom from distortion. Operation at a point of minimum distortion can result in considerable reduction of a given distortion term, but the results are critical with respect to operating conditions. Feedback is effective in reducing all types of distortion. However, the use of large amounts of negative feedback in r-f amplifiers is difficult and will require further study.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1953
- Accession Number
- ADA457739
Entities
People
- S. R. Swanson
Organizations
- United States Naval Research Laboratory