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UPC8130TA Datasheet(PDF) 10 Page - NEC

Part No. UPC8130TA
Description  VARIABLE GAIN AMPLIFIER SILICON MMIC FOR TRANSMITTER AGC OF DIGITAL CELLULAR TELEPHONE
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Maker  NEC [NEC]
Homepage  http://www.nec.com/
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UPC8130TA Datasheet(HTML) 10 Page - NEC

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10
µµµµPC8119T, µµµµPC8120T
APPLICATION for
µµµµPC8119T, µµµµPC8120T
1. TO GET MINIMUM GAIN
–1.
VCC line filtering
A low pass filter must be attached to VCC line in order to suppress RF input leakage to VCC. (The low pass
filter: for example
π type.) This filter must be inserted between VCC pin and matching inductor. If the low
pass filter is not attached to this point, minimum output level would not go down under the leakage level.
For example,
µPC8119T’s RF input leakage level to VCC shows –30 dBm at 950 MHz and –17 dBm at 1440
dBm.
π type low pass filter constant example
Pattern L = 5 to 6 nH, C5 = C6 = 1000 pF (Refer to TEST CIRCUIT1, 2 and APPLICATION CIRCUIT
EXAMPLE)
In the case of testing on ‘
µPC8119/20T TYPE2’ board, monitor the input leakage to VCC pin through ‘VCC
monitor line’ and adjust parallel capacitors to suppress leakage.
–2.
Capacitor feed-back between VAGC and VCC pins
Feed-back capacitor between VAGC and VCC pins must be externally attached in order to decrease
impedance difference.
2. TO GET MAXIMUM GAIN
–1.
Output matching
As for external matching circuit, only output port should be equipped in order to get maximum gain. Output
port matching in accordance with impedance of these ICs and next stage must keep the points as follows;
<1>
AC points
IC output impedance at maximum gain must be used.
Inductance of L must be chosen to get S22 ~ –20 dBm at maximum gain.
<2>
DC point
On LC matching, L of low DC resistance must be chosen to apply voltage as same as VCC to output
pin.
3. OTHERS
–1.
Input connection
Input port does not need to match externally. These ICs can be connected to front stage through coupling
capacitor (eg 1000 pF) for DC cut.
–2.
VCC ON/OFF while voltage applied to VAGC
Due to internal transistor’s voltage rating, ON/OFF can be controlled with VCC voltage while 3.0 V or less is
applied to VAGC.
For the usage and application of
µPC8119T and µPC8120T, please refer to the application note (Document
No. P12763E).


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