THE BIASED IDEAL RECTIFIER 



155 



The minimum value of D is then found to occur at tq = R/2 and is zero 

 db. We note from the curves that the minimum loss is 1.2 db when Ra = 

 10 and 0.4 when Ra = 100. 



This example is intended mainly as illustrative rather than as a complete 

 tabulation of possible detector solutions. The methods employed are 

 sufficiently general to solve a wide variety of problems, and the specific 

 evaluation 'process included should be sufficiently indicative of the proce- 

 dures required. Cases in which various other selective networks are asso- 

 ciated with the detector have been treated by Wheeler^. 



Fig. 11. — Conversion loss of 3/2 — power-law rectifier as envelope detector with impedance 

 of signal generator low except in signal band. 



m 14 

 o 



Z 12 



to 10 

 <n 



3 8 



Fig. 12. — Conversion loss of 3/2 — power-law rectifier as envelope detector with impedance 

 of signal generator low except in signal band. 



3. Two-Frequency Inputs 



The general formula for the coefficients in the two-frequency case depends 

 on a double integral as indicated by (1.10). In many cases one integration 

 may be performed immediately, thereby reducing the problem to a single 

 definite integral which may readily be evaluated by numerical or mechanical 



' H. A. \Mieeler, Design Formulas for Diode Detectors, Proc. I. R. E., Vol. 26, pp. 

 745-780, June 1938. 



