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參數(shù)資料
| 型號(hào)： | UPC8120T-E3 |
| 廠商： | NEC Corp. |
| 英文描述： | VARIABLE GAIN AMPLIFIER SILICON MMIC FOR TRANSMITTER AGC OF DIGITAL CELLULAR TELEPHONE |
| 中文描述： | 可變?cè)鲆娣糯笃鞴鑶纹l(fā)射機(jī)數(shù)字蜂窩電話自動(dòng)增益控制 |
| 文件頁(yè)數(shù)： | 10/52頁(yè) |
| 文件大?。?/td> | 550K |
| 代理商： | UPC8120T-E3 |
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10
μ
PC8119T,
μ
PC8120T
APPLICATION for
μ
PC8119T,
μ
PC8120T
1. TO GET MINIMUM GAIN
–1.
V
CC
line filtering
A low pass filter must be attached to V
CC
line in order to suppress RF input leakage to V
CC
. (The low pass
filter: for example
π
type.) This filter must be inserted between V
CC
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,
μ
PC8119T’s RF input leakage level to V
CC
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 ‘
μ
PC8119/20T TYPE2’ board, monitor the input leakage to V
CC
pin through ‘V
CC
monitor line’ and adjust parallel capacitors to suppress leakage.
–2.
Capacitor feed-back between V
AGC
and V
CC
pins
Feed-back capacitor between V
AGC
and V
CC
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 S
22
~ –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 V
CC
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.
V
CC
ON/OFF while voltage applied to V
AGC
Due to internal transistor’s voltage rating, ON/OFF can be controlled with V
CC
voltage while 3.0 V or less is
applied to V
AGC
.
For the usage and application of
μ
PC8119T and
μ
PC8120T, please refer to the application note (Document
No. P12763E).
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