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參數(shù)資料
| 型號： | TQ5132 |
| 廠商： | TRIQUINT SEMICONDUCTOR INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | 3V Cellular Band CDMA/AMPS RFA/Mixer IC |
| 中文描述： | TELECOM, CELLULAR, RF FRONT END CIRCUIT, PDSO8 |
| 封裝： | PLASTIC, SOT-23, 8 PIN |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 101K |
| 代理商： | TQ5132 |
TQ5132
Data Sheet
For additional information and latest specifications, see our website:
www.triquint.com
7
TQ5132 Product Description
The TQ5132 is a mniature low noise mxer (downconverter) in a
small SOT-23-8 package (2.9X2.8X1.14 mm with operation at
2.8v. The TQ5132 specs are designed to be compatible with IS-
98 InterimStandard for Dual-Mode CDMA cellular systems. The
low noise mxer features an AMPS control pin for
G
ain,
I
ntercept
and
C
urrent (
GIC
pin) and it has excellent intermodulation
characteristics with high intercept point in all modes. For
optimumperformance the TQ5132 RF frequency of operation
should be from869 to 894 MHz. The IF range is from85 to 130
MHz and its injection mode for the local oscillator is high side.
Operation
The TQ5132 is a single-ended mxer with switching capabilities
for the various signal levels found in CDMA applications. The
TQ5132 combines a RF amplifier, a LO driver amplifier, and
separate digitally controlled IF amplifiers for CDMA and AMPS
outputs.
2
1
4
5
6
8
3
7
RF /
C2
Mx Vdd
GND
GIC
CDMA
IF
Output
IFA GS /
C3
LO /
C1
AMPS
IF
Output
TQ5132
Figure 1. TQ5132 Block Diagram
Circuit Description
RF Amplifier
The TQ5132 has an integrated pre-amplifier stage in a cascode
configuration. The output is internally matched to 50 ohms at
881MHz. Pin 1 requires an external match that is set to deliver a
2:1 VSWR in both the low and high gain modes (i.e. RFA is on
or off). Figure 2 shows an approximated impedance at pin 1
(RFA input) to implement any desired match. Remember to
apply the LO signal when tuning the RF match.
2.0
1.0
0.5
-0.5
-1.0
-2.0
1.0
2.0
0.5
A
0.76 @ -65.5
z = 0.44 - j 1.46
y = 0.19 + j 0.63
A
Input
Impedance
Freq=881MHz
TQ5132
Figure 2. TQ5132 RF Amplifier Input Impedance
LO Buffer Amplifier
The LO buffer amplifier is a grounded gate FET with a
broadband match to 50
. It has on-chip DC block and on-chip
LO tuning circuit to shape the frequency response and drive it to
a level suitable for the gate of the mxer FET. Thus the optimum
LO frequency range is fixed and centered around 990mhz. The
LO is limted to high-side injection mode and it operates from
950MHz to 1030MHz. The input to the LO buffer is through pin 7
which also feeds the control line (C1) that selects the mxer
mode of operation, either CDMA or AMPS. Due to this logic
control, the only external component required at the LO port is a
series capacitor to prevent DC fromtraveling to other parts of
the system The LO drive level of operation should be between -
7 and 0 dBm Best performance is obtained between –6 and –
2 dBm
LO/filter/Mxer interaction
The physical position of the image reject filter is likely to have an
effect on the performance of the mxer especially in the Low
Gain mode where the RF amplifier is switched out. This is
primarily due to self-mxing of the LO energy bouncing fromthe
filter back into the mxer either out-of-phase or in-phase creating
an offset in magnitude. To mnimze this effect, TriQuint
recommends placing the image-reject filter as close to the IC as
possible. In TriQuint’s demo board its position is 42 mls from
the pad of the matching inductor and 126 mls fromthe IC pad.
This location for the image-reject filter works well.
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