A class-C power amplifier works at the critical point state. Assuming that Ec = 24 V, current conduction angle = 60 , 0(60 ) = 0.218, 1(60 ) = 0.391, collector current pulse maximum value Icmax = 2.2 A, collector voltage utilization factor = 0.9.

1) Please find out output power Po, power of power supply PS, collector efficiency c and collector equivalent load resistance Rc. (12)

2) If the load Rc suddenly becomes a short (Rc = 0), what will be the working status of the PA? How do Uc1m, Ic1m and Po change accordingly? (8)

2. (20") A class-C power amplifier works at the critical point state. Assuming that E. = 24 V, current conduction angle 6 = 609 20(609 = 0.218, :(609 = 0.391, collector current pulse maximum value Icmax = 2.2 A, collector voltage utilization factor $=0.9. 1) Please find out output power Po power of power supply Ps, collector efficiency nc and collector equivalent load resistance Re (12) 2) If the load Re suddenly becomes a short (Re = 0). what will be the working status of the PA? How do Uclm. Icim and P. change accordingly? (8) 2. (20") A class-C power amplifier works at the critical point state. Assuming that E. = 24 V, current conduction angle 6 = 609 20(609 = 0.218, :(609 = 0.391, collector current pulse maximum value Icmax = 2.2 A, collector voltage utilization factor $=0.9. 1) Please find out output power Po power of power supply Ps, collector efficiency nc and collector equivalent load resistance Re (12) 2) If the load Re suddenly becomes a short (Re = 0). what will be the working status of the PA? How do Uclm. Icim and P. change accordingly? (8)