LX5541

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 1

Co-Package 2.3 – 2.5 GHz HBT Power Amp +

pHEMT Low Noise Amplifier + SPDT Switch

TM

®

Copyright  2006

Rev. 1.3, 2008-02-11

D E S C R I P T I O N

D E S C R I P T I O N

D E S C R I P T I O N

D E S C R I P T I O N

LX5541 is a co-package RFIC

consisting

of

an

InGaP/GaAs

Heterojunction

Bipolar

Transistor

(HBT) power amplifier, an InGaAs

pseudomorphic HEMT (pHEMT) low

noise amplifier, and a SPDT switch.

All three RF devices are optimized for

WLAN applications in the 2.3 to 2.5

GHz frequency range.

The PA is implemented as a two-

stage monolithic microwave integrated

circuit (MMIC) with active bias and

output pre-matching. The LNA is fully

matched internally, and the LNA is

connected to the RX port of SPDT

switch directly inside the MLPQ

package.

Both PA and LNA operate with

single low voltage supply of 3.3V.

The PA (including SPDT switch loss)

offers 27 dB power gain between 2.3-

2.5GHz, at a low quiescent current of

90mA.

For 19dBm OFDM output power

(64QAM, 54Mbps) at the antenna port,

the PA including SPDT switch provides

a low EVM (Error-Vector Magnitude)

of about 3%, and consumes 145 mA

total DC current.

The LNA (including SPDT switch

loss) offers 13 dB gain, 2 dB noise

figure (switch contribution included)

and a high input IP3 of +5 dBm at 10

mA DC current.

LX5541 is available in a low profile

16-pin 3mmx3mm micro-lead package

(MLPQ-16L).

LX5541 with a PA,

LNA and SPDT integrated in a small,

low profile, and low thermal resistance

package offers an ideal compact front

end solution for IEEE 802.11b/g/n

applications.

K E Y F E A T U R E S

K E Y F E A T U R E S

K E Y F E A T U R E S

K E Y F E A T U R E S

Small Footprint: 3x3mm

2

Low Profile: 0.45mm

2.3-2.5GHz Operation

Single-Polarity 3.3V

Supply

On-Chip Active Bias Circuit

for both PA and LNA

TX Features:

Input matched PA

Quiescent Current ~ 90mA

Power Gain ~ 27 dB *

Total Current ~ 145mA for

Pout=19 dBm OFDM *

EVM~3 % at 19dBm (2%

at 17dBm) 54Mbps/64QAM

RX Features:

LNA Gain ~ 13 dB *

LNA Noise Figure ~ 2 dB *

LNA Input IP3 ~ +5dBm *

LNA On-Chip Input/Output

Match

* Including SPDT switch loss

A P P L I C A T I O N S

A P P L I C A T I O N S

A P P L I C A T I O N S

A P P L I C A T I O N S

IEEE 802.11b/g/n

B L O C K D I A

B L O C K D I A

B L O C K D I A

B L O C K D I A G R A M

G R A M

G R A M

G R A M

Ctl1

Ctl2

Ant

SwTxI

PAOut

DetI

DetO

PAIn

Vb1/Vb2

Vcc

LNAO

Vdd

Ext.

Match

Ctl1

Ant

Vdd

RxOut

Vcc

Vref

TxIn

Det

Ctl2