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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)： | 11/19頁 |
| 文件大小： | 110K |
| 代理商： | P12611EJ1V0AN00 |
5
2.4 Characteristics and Measurement
(1) Input/output impedance
This section describes the input/output impedance characteristics. As shown in Figure 2-5 (a), the
μ
PB1509GV’s
input impedance against the mixer’s LO input impedance is high enough (higher than 150
) and connecting a
voltage-controlled oscillator (VCO) is considered to cause no problem because the load is negligible in parallel
connection.
The output impedance fluctuates little and provides a stable output due to the emitter-follower circuit output
configuration. As shown in Figure 2-5 (b), the output impedance is between 150 and 200
and assures that the
output amplitude of 0.1 V
P-P
MIN can be obtained at a load impedance of 200
measured with the test circuit
specified in the Data Sheet.
Note that the test circuit includes a 150
resistor in front of the counter which is synthesized with the instrument
impedance in order to alternatively create a load impedance of 200
. However, this resistor is for measurement
purposes only and is not required in actual applications.
Figure 2-5. Smith Chart for
μ
PB1509GV (V
CC1
= V
CC2
= 3.0 V, SW1 = SW2 = 3.0 V)
(a) S11 (Input impedance)
1
2
3
S11
REF 1.0 Units/
2 200.0 mUnits/
55.375
–142.79
V
CC1
= V
CC2
= 3.0 V,SW1 = SW2 = 3.0 V
FREQUENCY
MHz
100.0000
200.0000
300.0000
400.0000
500.0000
600.0000
700.0000
800.0000
900.0000
1000.0000
MAG
· 929
· 898
· 866
· 840
· 834
· 819
· 803
· 792
· 787
· 771
ANG
–6.7
–10.5
–13.6
–15.9
–19.1
–21.9
–24.7
–27.0
–30.0
–32.7
S11
START 0.050000000 GHz
STOP 1.000000000 GHz
MARKER 2
700.0 MHz
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