Figure 7. Impedance or Admittance Coordinates

Zin

ZOL*

f = 400 MHz

100

Zo = 10 Ω

f

(MHz)

100

150

200

400

2.0 – j11.5

2.05 – j9.45

2.1 – j7.5

2.35 + j0.4

3.5 – j6

3.35 – j5.34

3.3 – j4.4

3.2 – j1.38

Zin

Ohms

ZOL*

Ohms

ZOL*: Conjugate of optimum load impedance

into which the device operates at a

given output power, voltage, current

and frequency.

200

150

f = 400 MHz

200

150

100

VDD = 28 V IDQ = 200 mA Pout = 100 W

NOTE: Input and Output Impedance values given are measured

gate–to–gate and drain–to–drain respectively.

4

REV 9