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參數(shù)資料
| 型號(hào)： | HFA3600IB96 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Low-Noise Amplifier/Mixer |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PDSO14 |
| 封裝： | PLASTIC, MS-012-AB, SO-14 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 430K |
| 代理商： | HFA3600IB96 |
13
optimum performance and tight distribution among production
lots. The open collector output permits direct interface to
moderate impedance IF filters as well as 50W input filters after
a simple “L” impedance matching network. A collector resistor
of 1K has been used throughout the characterization together
with an impedance matching network for 50W load
measurements.Withalow-3dBmLOlevel,atypicalSSBnoise
figure of 12.1dB, conversion gain of 7.0dB and a third order
output intercept point of +3.2dBm are the main features. The
LO input return loss is typically of 26dBm and the RF input
return loss has a typical value of 11dB.
Bias Network and Power Down
The Bias Network is responsible for the accurate setting of
both LNA and MIXER operating currents. The LNA operating
current is accurately set to 5mA while the MIXER is set to
4mA. Laser trimming procedures and a temperature
independent performance of the bias cell, assure the worst
case operating current variation of the LNA and MIXER of
1% over the operating temperature range.
The Bias network is powered by the Mixer V
CC
pin and has
a built in feature of disabling both the LNA and the MIXER
stages. The cell can be powered up and down within 10ms.
Power down total current consumption is in the order of
250mA. The simplified schematic of the power down input
circuit is shown below.
Low Voltage Operation
Low voltage operation is possible with the HFA3600. The
HFA3600 has been characterized with V
CC
of 4V and only
moderate degradations have been observed compared to
the AC performance at a V
CC
of 5V. The LNA gain shows a
0.8dB decrease and a 1.5dB degradation in the output
intercept point with no measurable impact on noise figure.
The MIXER behavior at 4V can be summarized with a
degradation of conversion gain and output intercept point of
0.8dB and a slight improvement in noise figure of 0.6dB.
Other relevant 4V performance characteristics include:
Total ICC: typical drop of 2.2mA
LNA Input Return Loss: degraded by 0.6dB
LNA Reverse Isolation: degraded by 1dB
LNA Output Return Loss: degraded by 1dB
RF to IF Isolation: no change
LOin to LNAin Isolation: improvement by 2dB
LNAOUT to Mixer RFIN Isolation: improvement by
0.2dB
Mixer LO to RF Isolation: no change
Mixer LO to IF Isolation: degrades by 0.5dB
Mixer RF input Return Loss: degrades by 1dB
Mixer LO Input Return Loss: degrades by 0.3dB at
800MHz and 1dB at 700MHz
Layout Considerations
The HFA3600 evaluation board layout has been carefully
designed for an accurate RF characterization of the device.
50
microstrip lines have been provided to permit the
connection of the LNA and MIXER independently and
facilitate the user interface for testing. Top ground planes
were used to assure adequate isolation between critical
traces.
The HA3600 package pinout has been laid out for best
isolation and overall device performance which also permits
the placement and connection of ground planes at pins 2, 4,
5, 10 and 12. Pin 4 and Pin 5 assure a low impedance
ground return for the LNA and also helps the isolation
between the LNA input and the LO input. The LNA output pin
is isolated from the RF input port with a good ground
connection between the top and back ground planes
terminated at pin 10. A series of plated through holes
resembling a stitch pattern are sufficient and important for
the LNA
-OUT
and RF
-IN
ports isolation, so the designer can
rely on the full characteristics of rejection of the image filter.
Similar isolation pattern is drawn and terminated in pin 12 to
isolate the RF
-IN
from the IF
-OUT
port.
A ground pad has been laid down beneath the package with a
series of plated through holes to minimize the inductance to
the ground plane and improve the device gain characteristics.
All device grounds must be connected as close to the
package as possible and the same applies to both V
CC
inputs and all V
CC
bypass capacitors. A small 4.7
μ
F
tantalum capacitor at the V
CC
line will prevent supply
coupling to the bias network if the device is subjected to
strong low frequency interference signals.
A protection diode has been added to the demonstration
board for extra protection and is not needed in an actual
application.
MIXER V
CC
10K
100K
PD
15K
FIGURE 35. ENABLE PIN INPUT CIRCUIT
HFA3600
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