Figure 7. Series Equivalent Input/Output Impedance

VDD = 28 Vdc, IDQ = 100 mA, Pout = 40 W

ZOL* = Conjugate of the optimum load impedance into which the device

output operates at a given output power, voltage and frequency.

NOTE: Input and output impedance values given are measured from gate to

gate and drain to drain respectively.

400

ZOL*

Zin

Zo = 50 Ω

500

f = 500 MHz

f = 175 MHz

400

175

f

MHz

Zin

Ohms

ZOL*

Ohms

175

3.7 – j 22.4

15.2 – j 16.6

400

3.6 – j 10.99

10.3 – j 7.99

500

2.88 – j 7.96

6.12 – j 9.43

Table 1. Input and Output Impedances

5

REV 3