參數(shù)資料
型號: MBC13900T1
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 小信號晶體管
英文描述: L BAND, Si, NPN, RF SMALL SIGNAL TRANSISTOR
封裝: ULTRA SMALL, PLASTIC, CASE 318M-01, SC-70, 4 PIN
文件頁數(shù): 3/24頁
文件大小: 691K
代理商: MBC13900T1
Applications Information
MBC13900 Technical Data, Rev. 1.1
Freescale Semiconductor
11
5.2
1900 MHz LNA
Figure 20 shows the schematic and Figure 21 shows the component placement for a 1900 MHz LNA. The
design goals for the circuit are:
NF < 1.35 dB
Gain > 14 dB
Return Loss > 10 dB, input and output
Unconditional stability from 100 MHz to 6 GHz.
Typical performance that can be expected from this circuit at 3.0 V VCC and 5.0 mA is listed in Table 6.
The component values can be changed to enhance the performance of a particular parameter but usually
at the expense of another. Gain can be improved by sacrificing stability (R3 and R5). Input return loss can
be sacrificed to improve noise figure. Input return loss can be improved at the expense of noise figure (C3,
C7, L4). IIP3 can be improved by increasing emitter degeneration (L3) and bias current (R2). Unused
traces are available on the PCB to add emitter degeneration at leads 1 and 3 of the device.
Figure 20. 1900 MHz LNA Schematic
C3
L1
R4
R3
C2
C4
V
CC
C1
R1
R2
RF In
RF Out
R5
L2
L4
C7
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