STUDY OF RECEIVER MIXER CHARACTERISTICS.
Quarterly rept. no. 2, 1 Sep-1 Dec 65,
GEORGIA INST OF TECH ATLANTA ENGINEERING EXPERIMENT STATION
Pagination or Media Count:
The response generating properties of diode mixers are investigated for a wide range of signal and local oscillator input levels. Experimental results are shown which verify that for large signal input levels, the diode approximates a switching device rather than a nonlinear mixing device. Prediction methods for diodes operated in a switching state are presented, and the complexity of prediction and analysis problems for diodes operated over varying ranges of signal levels is discussed. A pentode mixer with separate grid injection was studied in an effort to determine the effects of the tube operating parameters on spurious product formations. Response levels were recorded as a function of signal input level, control grid bias, and suppressor grid bias. The results show that pentode mixer response generation as a function of its operating parameters is extremely complex, and critically dependent upon incremental or programmed parameter changes. The data implies that realistic prediction methods will be difficult to achieve, and that future prediction efforts may of necessity be confined to maximum-upper-bound techniques. Author
- Electrical and Electronic Equipment