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參數(shù)資料
| 型號： | G12290EJ2V0AN00 |
| 英文描述： | uPC1663 DC to VHF Wideband Differential Input and Output Amplifier IC |
| 中文描述： | uPC1663直流高頻寬帶差分輸入和輸出功放IC |
| 文件頁數(shù)： | 14/23頁 |
| 文件大?。?/td> | 165K |
| 代理商： | G12290EJ2V0AN00 |
14
4. PRECAUTIONS FOR DESIGN IN
4.1 Cautions on Layout and Wiring
In high-frequency circuits, the PCB design can considerably influence circuit performance.
When using this device with an especially high gain, you must note that oscillation might occur even when there is
only a slight amount of external feedback.
The following cautions concern the device mounting layout.
x
Form as wide an area as possible for the ground pattern so as to prevent feedback due to conductor
inductance (a double sided copper clad epoxy glass PWB is recommended).
x
Make the leads from external components and the link wiring between front and rear components as short as
possible.
x
Use a single ground as the ground for input/output circuit and the power supply.
x
Form the ground pattern to shield the input and output wiring so as to prevent feedback due to stray
capacitance.
x
Lay out the output signal current path at a distance from the input wiring.
x
The power supply is bypassed very near to the IC's power supply pin by a small-inductance, high-frequency
capacitor. If the power supply wiring is long, insert a small resistance (up to 10
:
) in series.
x
The ground for the bypass capacitor should be laid out in order to form a loop only with the power supply line
so as to prevent the high-frequency current that runs throughout the PCB from entering the input.
4.2 Cautions on External Circuit
This IC features greatly improved phase characteristics, such that the characteristics inherent to this IC make it
one of the more stable wideband amplifier ICs. However, the following cautions should be noted when this IC is used
in application circuits.
x
Whenever possible, the signal source resistance values should be the same for the two inputs. Signal source
resistance values should be minimized, with 1 k
:
maximum (If the signal source impedance is too large, the
input amplitude becomes large and the output will become saturated).
x
Whenever possible, the load resistance values should be the same for the two outputs.
* For this IC, it is essential that a balance be maintained between the two lines (IN
1
to OUT
1
and IN
2
to OUT
2
)
in the application circuit.
4.3 Other Caution Points
x
Use of single (power) supply
This IC can be used with a single supply if the input voltage is biased at the intermediate between V
CC
as is shown in the application circuit example in the data sheet. More detailed circuit examples and their
characteristics are shown in Figure 9 and Tables 4 and 5.
+
and V
CC
e
,
Note, however, that in this case the load current along R
L
is more than twice as great as when the load is
connected with
r
power supply to a ground (recommended: max. 20 mA, I
O
= ).
V
R
L
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