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VG025 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - High Linearity Variable Gain Amplifier - WJ Communication

भाग संख्या VG025
समारोह High Linearity Variable Gain Amplifier
मैन्युफैक्चरर्स WJ Communication 
लोगो WJ Communication लोगो 
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VG025 pdf
VG025
High Linearity Variable Gain Amplifier
The Communications Edge TM
Product Information
Application Circuit Configurations
Circuit Board Material: .014” FR-4, 4 layers, .062” total thickness
The WJ VG025 variable gain amplifier can operate over a very
broad range of frequencies (50 - 2200MHz), but needs specific
matching circuits for specific bands of interest. At the maximum
gain state, reasonable matching is only available for about ±10% of
the reference frequency. The amplifier operates with a typical
current of 150 mA at +5 V while the attenuator current can be varied
from 0 to 30 mA, while maintaining constant OIP3 and P1dB. The
RF matching of the VG025 for the entire frequency range can be
accomplished with the systematic adjustment of only a few parts.
The RF matching is not influenced by different attenuator drive
methods provided there is adequate decoupling of the attenuator bias.
This reference application circuit uses voltage applied between 0
and 4.5V onto the Vctrl as shown on the schematic above. The R2 is
a current limiting resistor to help linearize the drive of the attenuator
and give better attenuator current control.
To properly design the VG025 for an application, pick the frequency
of interest. Choose blocking capacitor values which give RF
impedance of less than 3 ohms. Choose the RF chokes for the
largest inductance while still having resonant frequency about 30%
greater than the Reference frequency (this allows for good isolation
and inductor variation). Next choose L3 and C9 for interstage
matching. C9 is only needed for lower frequencies and determines
the low frequency roll off of the gain. L3 will have dominant
control over the input and output return losses at maximum gain
state (0 mA gain control pin current). C2 is needed to resonate the
package parasitics to achieve the maximum attenuation values with
attenuator current. With attenuator control pin current of 26 mA, C2
can be chosen to provide maximum attenuation. See the chart below
for suggested component values and predicted performance at
various reference frequencies. Component values can be
interpolated for reference frequencies not listed.
For lower frequencies the lumped element values can be used and
the layout with unplaced component pads does not greatly affect the
RF performance of the circuit. For frequencies greater than 500
MHz, component size and trace length have more influence on
circuit performance. Smaller components and shorter trace lengths
reduce the affects of the external component parasitics and
interaction with the multichip module parasitics.
Reference Frequency
C1, C5
C2
C3, C4
C6
C9
L1, L2
L3
L4
R1
R2
Attenuation Range
Maximum Gain
Input Return Loss
Output Return Loss
Output P1dB
Output IP3
Noise Figure
MHz 240
800 1850 1960 2140
pF 1000 56 56 56 56
pF 0 27 3.6 3.6 3.6
μF .01 .01 .01 .01 .01
pF DNP DNP DNP DNP DNP
pF 1.2 DNP DNP DNP DNP
nH 220
22
12
12
12
nH 47 8.2 DNP DNP DNP
nH DNP
82
33
33
33
DNP DNP DNP DNP DNP
120 120 120 120 120
dB 20 21 12 14 13
dB 15.4
15
8.6
8.4
8.4
dB 11 6.3 11 12 11
dB 11 7.6 7.7 6.5 5.6
dBm 21.8
21.3
22
22
22
dBm 42 39 40 40 40
dB 4.5 5.3 7.9 8.1 8.2
DNP = Do Not Place (Component is not used in the design)
Specifications and information are subject to change without notice
WJ Communications, Inc Phone 1-800-WJ1-4401 FAX: 408-577-6621 e-mail: sales@wj.com Web site: www.wj.com
Page 2 of 7 January 2006

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अनुशंसा डेटापत्रक

भाग संख्याविवरणविनिर्माण
VG025High Linearity Variable Gain AmplifierWJ Communication
WJ Communication


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