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參數(shù)資料
| 型號： | P12611EJ1V0AN00 |
| 英文描述： | MCU CMOS 28 LD 20MHZ 8K FLASH, -40C to +85C, 28-SOIC 300mil, TUBE |
| 中文描述： | uPB1509GV 1 GHz的輸入除以2。 4。 8預(yù)分頻器集成電路便攜式無線電系統(tǒng) |
| 文件頁數(shù)： | 14/19頁 |
| 文件大?。?/td> | 110K |
| 代理商： | P12611EJ1V0AN00 |
8
3. APPLICATION CIRCUIT DESIGN EXAMPLES
3.1 Output Amplitude Improvement
If the output amplitude is insufficient when the load is in the high impedance state, pull down the output pin of the
μ
PB1509GV with a DC resistor, so that the circuit current in the internal output amplifier can be increased as a DC
effect and the output amplitude can be increased. An example of an external circuit connected to the output stage is
shown in Figure 3-1. V
CC2
for the internal output amplifier is independent of V
CC1
. In this case, calculating based on
the internally allowable maximum current, use a pull-down resistor whose resistance Rpd is larger than 200
. (Refer
to the
Caution on page 10
.)
Figure 3-1. Example of External Circuit for Output Stage
OUT
OUT
GND
V
CC2
From power supply
Load Z
L
Pull-down resistor Rpd
(DC effect)
DC-cut capacitor
Divided frequency signal
IC
Bias circuit
<1> If Z
L
≥
400
, then the output compression
will be entered.
<2> If Rpd is included, the underlined value
increases according to the circuit current
increase.
Vout (V
P-P
)
= 2 2
×
Po
(W)
×
Z
L
(
)
If Rpd is not included,
At Z
L
= 200
, since Vout = 0.1 V
P-P
MIN.,
Po = 6.25
×
10
–6
W MIN (= –22 dBm)
∴
Vout = 7.1
×
10
–3
Z
L
V
P–P
MIN
When an external DC pull-down resistor increases the current of output amplifier, the output impedance becomes
40 to 50
, as shown in Figure 3-2. In this case, however, there is no change in the input impedance of the input
amplifier since the current increased flows only on the output stage.
You should note that this pull-down resistor is different from the RF resistor (for load impedance) that appears in
the Data Sheet.
Figure 3-2. Output Impedance Change by Output Pin’s Pull-Down Resistor
(V
CC1
= V
CC2
= 3.0 V, SW1 = SW2 = 3.0 V)
Pull-Down Resistor Rpd = 1.2 k
1
2
S22
REF 1.0 Units/
2 200.0 mUnits/
43.428
25.484
START 0.050000000 GHz
STOP 0.350000000 GHz
MARKER 2
350 MHz
Z
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