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參數(shù)資料
| 型號： | TPS9103PW |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | POWER SUPPLY FOR GaAs POWER AMPLIFIERS |
| 中文描述： | 電源供應(yīng)器的GaAs功率放大器 |
| 文件頁數(shù)： | 18/22頁 |
| 文件大?。?/td> | 341K |
| 代理商： | TPS9103PW |
TPS9103
POWER SUPPLY FOR GaAs POWER AMPLIFIERS
SLVS131A – OCTOBER 1995 – REVISED JULY 1996
18
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
dimensioning of the external charge pump
For systems in which the bias voltage requirement is not met by inverting the power rail, the BCLK output can
be used (with four passive components) to generate a higher V
DD.
The higher voltage is then inverted as before
to produce the bias voltage. This voltage is also available for other parts of the main circuitry (see Figure 16).
With the TPS9103, an external charge pump could be used to increase the voltage at V
DD
, thereby deriving a
higher negative voltage at GATE_BIAS than would otherwise be available.
1
+
C8
VDD
D1
D2
VCC
V
BCLK
C7
Figure 16. External Charge Pump
When BCLK is low, node 1 charges up to V
CC
– V
diode
. When BCLK goes high, node 1 is 2 V
CC
– V
diode
. The
capacitor C8 charges up to 2 V
CC
– 2 V
diode
. This voltage can then be connected to V
DD
.
The magnitude of V
ripple
of V
DD
is determined by the value of C8. Capacitor value must be large enough that
the discharge during one period is not as great as the maximum voltage variation allowable. The discharge of
C8 depends on the load current.
C8
IO(GATE_BIAS)
Vripple
f
With a supply voltage of V
CC
= 3.3 V, a maximum voltage variation (V
ripple
)
of 2% = 66 mV and a load of
I
CC
= 10 mA, the value of C8 is 3
μ
F. A 4.7
μ
F meets this requirement.
The capacitance of C7 can be calculated using an equivalent resistance method:
Requivalent
1
C7
f
Using 0.22
μ
F for C7, the equivalent resistance is:
Requivalent
1
0.22
F
50 kHz
90
Add the equivalent resistance to the internal resistance of the switch (10
):
R
TOTAL
= 90 + 10 = 100
With a total resistance of 100
and with 10 mA flowing through it, a voltage drop of 1 V occurs. Thus with 3.3
V on V
CC
the output is 4.2 V with a 42-mV ripple.
Care must be taken that the maximum voltages are not exceeded when using BCLK as a charge pump (see
Figure 17).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS9103PWR | 制造商:Rochester Electronics LLC 功能描述:POWER SUPPLY FOR GAAS POWER AMPLIFIERS - Bulk |
| TPS9103Y | 制造商:TI 制造商全稱:Texas Instruments 功能描述:POWER SUPPLY FOR GaAs POWER AMPLIFIERS |
| TPS9104 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:CELLULAR SUBSCRIBER TERMINAL POWER SUPPLY/AUDIO SYSTEM |
| TPS9104IPT | 制造商:Rochester Electronics LLC 功能描述:LINBICMOS CELLULAR POWER SUPPLY/AUDIO SY - Tape and Reel |
| TPS9104IPTR | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
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