Rainbow-electronics MAX2644 Uživatelský manuál stáhnout pdf (Strana 5)

MAX2644

2.4GHz SiGe, High IP3 Low-Noise Amplifier

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Applications Information

Input Matching

Input matching is required for optimum performance.

The MAX2644 requires a simple LC matching network,

as shown in the Typical Operating Circuit. To further

reduce cost and external component count, replace the

external inductor with a microstrip transmission line.

The Typical Operating Circuit shows the recommended

input matching network for the MAX2644 at 2450MHz.

These values are optimized for best simultaneous gain,

noise figure, and return loss performance.

Line Bypassing

Bypassing the V

line is necessary for optimum

gain/linearity performance. A transmission line and two

capacitors are required, as shown in the schematics in

Figures 1 and 2. The optimum dimensions and posi-

tions of the components are as follows: the output

transmission line dimension is 0.532in (length) ✕ 0.012in

(width); the distance from C2 to the IC is 0.352in; and

the distance from C3 to the IC is 0.041in. Please refer

to Figures 1 and 2 for component values.

MAX2644

SMA

RFIN

SMA

RFOUT

33pF

3.3nH

GND

15pF

Length = 400mils

33pF

GND

RFIN

GND

RFOUTBIAS

GAIN: 16dB

IIP3: +1dBm

3.9nH

1.2kΩ

Figure 2. High Linearity Design

MAX2644 MAX2644

BIAS BIAS

(a) (b)

Figure 3. Recommended MAX2644 Standby Configurations

1 2 3 4 5 6 7 8

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