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參數(shù)資料
| 型號(hào)： | TQ5M31 |
| 廠商： | TRIQUINT SEMICONDUCTOR INC |
| 元件分類(lèi)： | 衰減器 |
| 英文描述： | 3V Downconverter Mixer IC |
| 中文描述： | RF/MICROWAVE DOWN CONVERTER |
| 封裝： | ROHS COMPLIANT, PLASTIC, SOT-23, 6 PIN |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大小： | 229K |
| 代理商： | TQ5M31 |
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TQ5M31
Data Sheet
12
For additional information and latest specifications, see our website:
www.triquint.com
General Description
TQ5M31 is a general purpose RFIC mxer downconverter
designed for multiple applications. The mxer is implemented
with a single common-source GaAs MESFET and is designed
to operate with supply voltages from1.8 to 5 Volts. To use the
TQ5M31, tuning components must be selected for the LO
buffer amplifier and the mxer IF port. An external shunt
inductor on the output of the LO Buffer is needed to resonate
with on-chip capacitance to shape the frequency response
and roll off unwanted noise which mght otherwise be injected
into the mxer. The "
open-drain
" IF output allows for flexibility
in matching to various IF frequencies and filter impedances.
Access to the GIC pin allows flexibility in Gain, Third Order
Intercept, and Power Supply Current. By configuring the GIC
pin with one or two external resistors and a capacitor, the part
can be used in a wide variety of wireless receiver systems.
The TQ5M31 is in a mniature, low cost, 6 lead package
(SOT-23-6). Total dimensions are 2.9 by 2.8 mmwith a height
of 1.14 mm
The LO and RF ports have internal DC blocking capacitors
and are internally matched to 50
. This simplifies the design
and keeps the number of external components to a mnimum
Applications
Please refer to the above applications circuit.
LO Buffer Tune (Pin 1)
The broadband input match of the LO buffer amplifier, may
cause thermal and induced noise at other frequencies to be
amplified and injected directly into the LO port of the mxer.
Noise at the IF frequency, and at (LO +/- IF) frequency will be
downconverted and emerge at the IF port, degrading the
downconverter noise figure.
The output node of the L0 buffer amplifier is brought out to Pin
1 and connected to a shunt inductor to ground. This inductor
is selected to resonate with internal capacitance at the L0
frequency in order to roll off out-of-band gain and improve
noise performance. This approach allows selectivity in the L0
buffer amplifier along with the ability to use the TQ5M31 with
multiple applications.
Calculation of Nominal L Value for LO pin
The proper inductor value must be determned during the
design phase. The internal capacitance at Pin 1 is
approximately 1 pF. Stray capacitance on the board
surrounding Pin 1 will add to the internal capacitance, so the
nomnal value of inductance can be calculated, but must be
confirmed with measurements on a board approximating the
final layout.
T
1
2
3
Ground
Ground Placement
is adjusted between
standard inductor values
Figure 3. LO Tuning
The inductor is selected to resonate with the total capacitance
at the LO frequency using the following equation:
(
)
L
C
f
where C
pF
=
=
1
Π
2
1.0
2
,
Verification of Proper LO Buffer Amp Tuning
Using a Network Analyzer
Procedure:
Connect port 1 of the network analyzer to the L0 input (Pin 3)
of the TQ5M31 with the source power set to -4 dBm Connect
a coaxial probe to Port 2 of the network analyzer and attach
the probe approximately 0.1 inch away fromeither Pin 1 or the
inductor. The magnitude of S21 represents the LO buffer
frequency response (figure 4).
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| TQ5M31A | 功能描述:射頻混合器 500-2500MHz 3Volts RoHS:否 制造商:NXP Semiconductors 頻率范圍: 轉(zhuǎn)換損失——最大: 工作電源電壓:6 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| TQ5M31J | 制造商:TRIQUINT 制造商全稱(chēng):TriQuint Semiconductor 功能描述:TQ5M31J |
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