DEMO-MGA-231T6 Datasheet, PDF (5/15 Pages) Broadcom Corporation. – High-Gain GPS LNA with Variable Current and Shutdown Function

Vd
Vsd
R1
L1
(R1 and L1 optional,
see notes [3] below)
C3
C1
(C3 and R2 are optional,
see notes [3, 4] below)
C2
R2 (Rbias)
1
L3
RFin
2
MGA-231T6
Bias/control
L2
6
5
RFout
L4
3
NU
4 _NU [1]
Notes:
1. Pin 4 must be left unconnected
2. L3 and L4 form the input matching network. C2 and L2 form a matching network at the output of the LNA.
3. L1 and R1 isolates the demoboard from external disturbances during measurement. It is not needed in actual application. Likewise, C1 and C3
mitigate the effect of external noise pickup on the Vdd and SD lines respectively. These components are not required in actual operation.
4. Bias control is achieved by either varying the SD voltage with/without R2, or fixing the SD voltage to Vdd and adjusting R2 for the desired current.
R2 = 8.2 kOhm will result in 4mA when Vdd = 2.85V, Vsd = 1.8V or Vdd = 1.8V, Vsd = 2.6V. R2 = 5.6 kOhm will result in 6mA when Vdd = Vsd = 2.7V.
Figure 2. Demo board and application schematic diagram
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