Circuit behavior and impedance characteristics of broad-band TRAPATT-mode amplifiers
Abstract
A brief review of high-efficiency oscillators is presented. It is argued that an oscillator and a broad-band amplifier do not represent fundamentally different modes of operation, and that their circuit behavior and impedance characteristics can be similar. Measured and calculated impedance characteristics of amplifiers employing coaxial-line and coupled-microstrip circuits are presented. These and previously published impedance data are discussed in terms of amplifier performance. It is shown that an amplifier employing a package with large lead inductance can have wide bandwidths for the harmonic impedances. However, arguments are presented indicating that the high harmonic impedances characteristic of these circuits are not optimum but result in relatively low efficiency.
- Publication:
-
IEEE Transactions on Microwave Theory Techniques
- Pub Date:
- January 1979
- DOI:
- 10.1109/TMTT.1979.1129553
- Bibcode:
- 1979ITMTT..27...23Q
- Keywords:
-
- Avalanche Diodes;
- Broadband Amplifiers;
- Electrical Impedance;
- Network Analysis;
- Performance Prediction;
- Trapatt Devices;
- Coaxial Cables;
- Equivalent Circuits;
- Impedance Measurement;
- Microstrip Transmission Lines;
- Microwave Oscillators;
- Power Efficiency;
- Electronics and Electrical Engineering