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參數(shù)資料
| 型號： | TQ5121 |
| 廠商： | TRIQUINT SEMICONDUCTOR INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | 3V Cellular TDMA/AMPS LNA/mixer Receiver IC |
| 中文描述： | TELECOM, CELLULAR, RF FRONT END CIRCUIT, PDSO16 |
| 封裝： | POWER, PLASTIC, QSOP-16 |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 153K |
| 代理商： | TQ5121 |
TQ5121
Data Sheet
For additional information and latest specifications, see our website:
www.triquint.com
5
TQ5121 Product Description
The TQ5121 3V RFIC Downconverter is designed specifically
for cellular band TDMA applications. The TQ5121 contains a
LNA+Mxer circuit to handle the 800 MHz cellular band. The IF
frequency range covers 70 to 140 MHz with most of the ports
internally matched to 50
simplifying the design and keeping
the number of external components to a mnimum
Operation
Please refer to the test circuit above.
Low Noise Amplifier (LNA)
The LNA section of the TQ5121 consists of a cascaded
common source FETs (see Fig 1). The LNA is designed to
operate on supply voltages from3V to 5V. The source termnal
has to be grounded very close to the pin, this will avoid a
significant gain reduction due to degeneration. The LNA
requires a matching circuit on the input to provide superior
noise, gain and return loss performance. The output is close to
50
for direct connection to a 50
image stripping filter.
LNA Input Match
To obtain the best possible combination of performance and
flexibility, the LNA was designed to be used with off-chip
impedance matching on the input. Based on the system
requirements, the designer can make several performance
trade-offs and select the best impedance match for the
particular application.
The input matching network primarily determnes the noise and
gain performance. Fig 2 shows a suggested input match using
a series 1.2pF capacitor and a shunt 10nH inductor.
The LNA gain, noise figure and input return loss are a function
of the source impedance (Z
s
), or reflection coefficient (
Γ
s
),
presented to the input pin. Highest gain and lowest return loss
occur when
Γ
s
is equal to the complex conjugate of the LNA
input impedance. A different source reflection coefficient,
Γ
opt
,
which is experimentally determned, will provide the lowest
possible noise figure, F
mn
.
The noise resistance, R
n
, provides an indication of the sensitivity
of the noise performance to changes in
Γ
s
as seen by the LNA
input.
(
)
F
F
R
Z
s
LNA
MIN
N
opt
S
opt
=
+
+
4
1
1
0
2
2
2
Γ
Γ
Γ
Γ
Components such as filters and mxers placed after the LNA
degrade the overall systemnoise figure according to the
following equation:
F
F
F
G
SYSTEM
LNA
LNA
=
+
2
1
F
LNA
and
G
LNA
represent the linear noise factor and gain of the
LNA and
F
2
is the noise factor of the next stage. Thus, the
systemnoise figure depends on the highest gain and mnimum
noise figure of the LNA.
Designing the input matching network involves a compromse
between optimumnoise performance and best input return loss.
For example, when the TQ5121 LNA is matched for optimum
noise figure (1.35dB @ 880 MHz), the input return loss is
approximately 4dB. On the other hand, when the LNA is
matched for best return loss, the LNA noise figure is
approximately 1.95dB @ 881 MHz. See Table 1 for noise
parameters.
LNA
out
LNA
in
Fig 1. TQ5121
Simplified
Schematic of
LNA Section
Vdd
BIAS
BIAS
LOAD
Fig 2. Suggested LNA Input Match
Note: These values assume ideal components and neglect board parasitic.
The discrepancy between these values and those of the typical application
circuit are the board and component parasitic
RF
IN
10nH
1.2pF
Pin 7
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TQ5122 | 制造商:TRIQUINT 制造商全稱:TriQuint Semiconductor 功能描述:3V Cellular TDMA/AMPS Receiver IC With Power- Down |
| TQ5131 | 制造商:TRIQUINT 制造商全稱:TriQuint Semiconductor 功能描述:3V Cellular Band CDMA/AMPS RFA/Mixer IC |
| TQ5132 | 功能描述:射頻放大器 CDMA Low Band Mixer RoHS:否 制造商:Skyworks Solutions, Inc. 類型:Low Noise Amplifier 工作頻率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 輸出截獲點(diǎn):37.5 dBm 功率增益類型:32 dB 噪聲系數(shù):0.85 dB 工作電源電壓:5 V 電源電流:125 mA 測試頻率:2.6 GHz 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 封裝:Reel |
| TQ5135 | 制造商:TRIQUINT 制造商全稱:TriQuint Semiconductor 功能描述:3V Cellular CDMA/AMPS LNA/Mixer Receiver IC |
| TQ5139 | 制造商:TRIQUINT 制造商全稱:TriQuint Semiconductor 功能描述:2.8V SiGe Dual-Mode CDMA Rx Receiver |
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