1 MHz to 2.7 GHz

RF Gain Block

AD8354

Rev. C

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FEATURES

Fixed gain of 20 dB

Operational frequency of 1 MHz to 2.7 GHz

Linear output power up to 4 dBm

Input/output internally matched to 50 Ω

Temperature and power supply stable

Noise figure: 4.2 dB

Power supply: 3 V or 5 V

APPLICATIONS

VCO buffers

General Tx/Rx amplification

Power amplifier predrivers

Low power antenna drivers

FUNCTIONAL BLOCK DIAGRAM

AD8354

BIAS AND VREF

INPT

VPOS

VOUT

COM2

COM1

Figure 1.

GENERAL DESCRIPTION

The AD8354 is a broadband, fixed-gain, linear amplifier that

operates at frequencies from 1 MHz up to 2.7 GHz. It is

intended for use in a wide variety of wireless devices, including

cellular, broadband, CATV, and LMDS/MMDS applications.

By taking advantage of ADI’s high performance, complementary Si

bipolar process, these gain blocks provide excellent stability

over process, temperature, and power supply. This amplifier is

single-ended and internally matched to 50 Ω with a return loss

of greater than 10 dB over the full operating frequency range.

The AD8354 provides linear output power of nearly 4.3 dBm

with 20 dB of gain at 900 MHz when biased at 3 V and an

external RF choke is connected between the power supply and

the output pin. The dc supply current is 24 mA. At 900 MHz,

the output third-order intercept (OIP3) is greater than 18 dBm;

at 2.7 GHz, the OIP3 is 14 dBm.

The noise figure is 4.2 dB at 900 MHz. The reverse isolation

The AD8354 can also operate with a 5 V power supply; in

which case, no external inductor is required. Under these

conditions, the AD8354 delivers 4.88 dBm with 20 dB of gain

at 900 MHz. The dc supply current is 26 mA. At 900 MHz, the

OIP3 is greater than 19 dBm; at 2.7 GHz, the OIP3 is 15 dBm.

The noise figure is 4.4 dB at 900 MHz. The reverse isolation

The AD8354 is fabricated on ADI’s proprietary, high performance,

25 GHz, Si complementary, bipolar IC process. The AD8354 is

available in a chip scale package that uses an exposed paddle for

excellent thermal impedance and low impedance electrical

connection to ground. It operates over a −40°C to +85°C

temperature range, and an evaluation board is also available.