Figure 8. Series Equivalent Input and Output Impedance

f

MHz

Zin

Ohms

ZOL*

Ohms

500

400

290

2.09 – j2.77

2.63 – j7.58

0.93 – j3.80

4.87 – j2.63

3.09 – j5.24

7.35 – j8.67

ZOL* =Conjugate of the optimum load impedance into

which the device output operates at a given output

power, voltage and frequency.

VDD = 28 V, IDQ = 25 mA, Pout = 20 Watts

f = 290 MHz

Zo = 10 Ω

Zin

ZOL*

400 MHz

500 MHz

500 MHz

400 MHz

f = 290 MHz

Figure 9. MRF166C Test Fixture

5

REV 10