Specifications subject to change without notice

Filtronic Compound Semiconductors Ltd

Tel: +44 (0) 1325 301111

Fax: +44 (0) 1325 306177

Email: sales@filcs.com

2

Datasheet v3.0

FPD1500DFN

Notes:

Drain-Source Voltage

VDS

-3V < VGS < +0V

8V

Gate-Source Voltage

VGS

0V < VDS < +8V

-3V

Drain-Source Current

IDS

For VDS > 2V

IDss

Gate Current

IG

Forward or reverse current

15mA

RF Input Power

2

PIN

Under any acceptable bias state

350mW

Channel Operating Temperature

TCH

Under any acceptable bias state

175°C

Storage Temperature

TSTG

Non-Operating Storage

-55°C to 150°C

Total Power Dissipation

PTOT

See De-Rating Note below

2.2W

Gain Compression

Comp.

Under any bias conditions

5dB

Simultaneous Combination of Limits

3

2 or more Max. Limits

permanent damage to the device

Total Power Dissipation to be de-rated as follows above 22

°C:

(coefficient of de-rating formula is the Thermal Conductivity)

Example: For a 65

°C carrier temperature: P

recommended to provide for adequate thermal management. Ideally the bottom of the circuit board is affixed to a

heatsink or thermal radiator

•

Active bias circuits provide good performance stabilization over variations of operating

temperature, but require a larger number of components compared to self-bias or dual-biased.

Such circuits should include provisions to ensure that Gate bias is applied before Drain bias,

otherwise the pHEMT may be induced to self-oscillate

•

Dual-bias circuits are relatively simple to implement, but will require a regulated negative voltage

supply for depletion-mode devices.

•

For standard Class A operation, a 50% of IDSS bias point is recommended. A small amount of

RF gain expansion prior to the onset of compression is normal for this operating point. Note that

pHEMTs, since they are “quasi- E/D mode” devices, exhibit Class AB traits when operated at 50%

of IDSS. To achieve a larger separation between P1dB and IP3, an operating point in the 25% to

33% of IDSS range is suggested. Such Class AB operation will not degrade the IP3 performance.