LOW NOISE TUNNEL DIODE MIXERS AND CONVERTERS.
Abstract
The theoretical analysis of the tunnel diode converter has been extended, giving special attention to stability and non-sinusoidal local oscillator voltage wave shape. A criterion for stability has been defined utilizing the concept of sensitivity of gain. The sensitivity function is then applied to the input (RF) and the output (IF) circuits of the converter to analyze the effects of mismatched source and load on the performance of the converter. The effect of non-sinusoidal local oscillator is considered. Two analytical methods for calculating the modified conductance coefficients of the con verter for the non-sinusoidal case are outlined in detail. Experimental models of the UHF tun nel diode converter built in microstrip are dis cussed and a number of measured results are pre sented. The experimental effort on the X-Band tunnel diode converter has begun. A new circuit utilizing coaxial components is being designed. Design principles of special tunnel diodes for the X-Band converter are outlined. Refinements in fabrication techniques have led to improved gallium antimonide units, featuring extremely low (0.1nH) lead inductances and high (>25Gc) cutoff frequencies. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1963
- Accession Number
- AD0417703
Entities
People
- Raoul Pettai
- Stuart Becker