Wide Band Image Recovery Mixer.

Abstract

The program was aimed at achieving broadband low noise superheterodyne receiver front ends, without the expense and complexity of using low noise preamplifiers at the signal frequency. The approach was based on recovery of mixer generated image power to obtain reduced mixer conversion loss. A mathematical model for analyzing the image recovery mixer was derived, using scattering parameters and signal flow graph techniques. Based on the analysis, experimental model X-band mixers with I.F. preamplifiers were constructed in both strip line and microstrip circuitry. A noise figure ranging between 4.1 and 4.8 db was achieved over nearly 1 GHz of band width. This represents a one to two db improvement over X-band tunnel diode amplifiers. In addition to offering improved sensitivity, the image recovery mixer-preamplifier provides improved dynamic range and lower cost as compared to a tunnel diode amplifier.

Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1974
Accession Number
ADA003337

Entities

People

  • Alexander J. Kelly
  • Herman C. Okean

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Amplifiers
  • Broadband
  • Diodes
  • Dynamic Range
  • Frequency
  • Low Noise
  • Mathematical Models
  • Models
  • Noise
  • Preamplifiers
  • Recovery
  • Strip Transmission Lines
  • Superheterodyne Receivers
  • Tunnel Diodes
  • X Band

Fields of Study

  • Physics

Readers

  • Electronics Engineering
  • Image Processing and Computer Vision.

Technology Areas

  • Microelectronics