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參數(shù)資料
| 型號： | TQ3M31 |
| 廠商： | TRIQUINT SEMICONDUCTOR INC |
| 元件分類： | 衰減器 |
| 英文描述： | Dual Band LNA: 2.8V, Cellular and PCS Band CDMA/AMPS LNA IC |
| 中文描述： | 832 MHz - 894 MHz RF/MICROWAVE NARROW BAND MEDIUM POWER AMPLIFIER |
| 封裝： | 3 X 3 MM, LEAD LESS, MLF-16 |
| 文件頁數(shù)： | 10/18頁 |
| 文件大?。?/td> | 381K |
| 代理商： | TQ3M31 |
TQ3M31
Data Sheet
10
For additional information and latest specifications, see our website:
www.triquint.com
Operation
MODE
Gain_Ctl
Mode Ctl
Cell Vdd
PCS Vdd
Typical
gain
13.5 (dB)
11.5 (dB)
-2 (dB)
13 (dB)
11 (dB)
-5 (dB)
PCS HG
PCS HGLL
PCS Bypass
Cell HG
Cell HGLL
Cell Bypass
0
0
1
0
0
1
0
1
1
0
1
1
0
0
0
Vdd
Vdd
Vdd
0
0
0
Vdd
Vdd
Vdd
Table 1 LNA States and Control Bits
LNA Input Network Design
Input network design for most LNA’s is a straightforward compromse between noise figure and gain. The TQ3M31 is no exception,
even though it has 3 different modes. The device was designed so that one only needs to optimze the input match in the high gain
mode. As long as the proper grounding and source inductance are used, the other two modes will performwell with the same match.
It is probably wise to synthesize the matching network component values for some intermediate range of Gamma values, and then by
experimentation, find the one which provides the best compromse between noise figure and gain. The quality of the chip ground will
have some effect on the match, which is why some experimentation will likely be needed. The input match will affect the output match
to some degree, so S22 should be monitored.
The values used on our evaluation board may be taken as a starting point. It has to be noted that another input match network was
tested (PCS: 7pF series cap & 2.2nH shunt ind; Cell: 5.6nH series ind & 5.6nH shunt ind) but it proved to degrade the NF and IIP3.
Noise Parameter Analysis
A noise parameter analysis is shown below for the high gain and HGLL modes. A “nomnal” device was mounted directly on a
standard evaluation board without matching network (through connected). The input reference plane was set at pin 1 & 4 and board
loss was included in the calculations. C7 was set to 39pf and C8 to 18pF.
Gamma Opt analysis for TQ3M31 High Gain Mode – PCS band
Freq.
(MHz)
Γ
opt
Γ
angle
F min
R noise
Point#
1800
0.38
81.2
1.19
17.4
1
1960
0.33
86.6
1.23
17.0
2
2040
0.33
91.4
1.28
15.9
3
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