THE LIMITED SPACE-CHARGE ACCUMULATION MODE IN BULK GALLIUM ARSENIDE.
Abstract
The limited space-charge accumulation (LSA) mode provides a source of microwave power at the circuit frequency by inhibiting the formation of high field domains. LSA operation is possible when the GaAs device is placed in a high Q anti-resonant circuit, and the ratio of carrier density to circuit frequency (n/f) is between 10,000 and 200,000 sec/cc. The optimum n/f ratio for space-charge control was determined experimentally at S-band for several different bias fields. The n/f ratio for highest efficiency was found to increase with the applied field. The variation of efficiency with the microwave resistance at the device terminals was also investigated. For a device biased at three times the threshold field for traveling domains, the peak efficiency was obtained when the circuit resistance was 12-13 times the low field resistance of the sample. The results agree very well with computer simulations of the LSA mode based on Butcher and Fawcett's velocity-field characteristic. Peak powers of 88 watts at S-band for 0.4 microsec pulses were obtained with a device operated at eight times the domain threshold.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1967
- Accession Number
- AD0823689
Entities
People
- Richard J. Gilbert
Organizations
- Cornell University College of Engineering