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參數(shù)資料
| 型號(hào)： | TQ5122 |
| 廠商： | TRIQUINT SEMICONDUCTOR INC |
| 元件分類： | 無(wú)繩電話/電話 |
| 英文描述： | 3V Cellular TDMA/AMPS Receiver IC With Power- Down |
| 中文描述： | TELECOM, CELLULAR, RF FRONT END CIRCUIT, PDSO16 |
| 封裝： | PLASTIC, QSOP-16 |
| 文件頁(yè)數(shù)： | 5/9頁(yè) |
| 文件大?。?/td> | 84K |
| 代理商： | TQ5122 |
TQ5122
Data Sheet
For additional information and latest specifications, see our website:
www.triquint.com
5
TQ5122 Product Description
The TQ5122 3V RFIC Downconverter is designed specifically
for cellular band TDMA/AMPS applications. The TQ5122
contains LNA, Mxer and LO buffer circuits matched to the 800
MHz cellular frequency band. The IF frequency may be selected
between 85 and 150 MHz. Most RF ports are internally
matched to 50
simplifying the design and mnimzing the
number of external components. The TQ5122 also includes a
power
–
down mode switch which allows current saving during
standby and the non-operating portion of the TDMA pulse.
Operation
Please refer to the test circuit above.
Low Noise Amplifier (LNA)
The LNA section of the TQ5122 are cascaded common source
FET
’
s, see Figure 1. It is designed to operate on DC supply
voltages from2.7V to 5V. The source termnal must be
grounded as close as possible to Pin 8 to avoid significant gain
reduction due to degeneration. The LNA requires an input
matching circuit to obtain best noise figure, gain and return loss.
The LNA output is close to 50
for direct connection to a 50
image reject filter.
LNA
out
LNA
in
Vdd
BIAS
BIAS
LOAD
Figure 1. Simplified Schematic of LNA Section
LNA Input Match
The designer can make some Noise Figure and Gain trade off
by varying the off chip LNA input matching circuit values and
topology. This allows the TQ5122 to be optimzed for specific
systemrequirements.
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 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. The system
noise figure is a compromse between the highest gain and
mnimumnoise figure of the LNA. See Table 1 for noise
parameters.
Table 1. TQ5122 Noise Parameters
|Gopt|
/ Gopt
Freq.
MHz
830
880
930
Fmn
Rn
0.88
0.83
0.82
34.5
37.8
40.0
0.75
0.89
0.97
51.2
50.4
50.0
LNA Output Match
The output impedance of the LNA was designed for 50
. The
internal 50
match elimnates the need for external
components at this port. It also improves IP3 performance and
power gain.
The output of the LNA is intended to be connected directly to an
image reject filter. Depending on the filter, additional
components may be needed to better match to the LNA output.
Some image reject filters may require a series inductor to
smooth the frequency response and improve overall
performance.
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