PMB2362 Datasheet, PDF (11/24 Pages) Infineon Technologies AG – Wireless Components Dual LNA

Confidential
PMB 2362
preliminary
Functional Description
3.4 Circuit Description
1. General Description
The PMB2362 is a dual band LNA circuit designed for dual band wireless fron-
tends with excellent performance.
2. LNA1
The LNA1 is designed for input frequencies between 0.9 and 1.0GHz. Entering
the IC at the base input pin AI1 the RF input signal is amplified in the LNA1
stage. The gain of this LNA stage is controlled by the DC level at pin GC and
can be adjusted in a 20 dB step. The LNA output is internal matched and at pin
AO1 the amplified and matched signal is available for further use.
3. LNA2
The LNA2 is designed for input frequencies between 1.8 and 1.9GHz. Entering
the IC at the base input pin AI2 the RF input signal is amplified in the LNA2
stage. The gain of this LNA stage is also controlled by the DC level at pin GC
and can be adjusted in a fixed gain step. The open collector LNA output at pin
AO2 has to be connected to VCC and external matching elements.
4. COMMON
VCC is the supply voltage for both LNAs. The grounding is done with the heat
sink at the bottom side of the package. An internal bias driver generates supply
voltage and temperature compensated reference voltages. The PD pin allows
the circuit to be switched in a low power consuming (sleeping) mode. All pins
with the exception of GND are ESD protected.
Wireless Components
3-4
Specification, January 2000