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參數(shù)資料
型號: THS4601IDG4
廠商: TEXAS INSTRUMENTS INC
元件分類: 音頻/視頻放大
英文描述: 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
封裝: GREEN, PLASTIC, MS-012AA, SOIC-8
文件頁數(shù): 8/34頁
文件大小: 826K
代理商: THS4601IDG4
THS4601
SLOS388B OCTOBER 2001 REVISED JUNE 2002
16
www.ti.com
APPLICATION INFORMATION
measuring transimpedance bandwidth (continued)
VS
50
50
RS
C1
C2
Network Analyzer
IO
I
O
V
S
+
1
2R
S
1
)
C
1
C
2
(above the pole frequency)
NOTE: This interface network creates a capacitive, constant current source from a network analyzer and properly terminates the network analyzer
at high frequencies.
Figure 32. Emulating a Capacitive Current Source With a Network Analyzer
The transconductance transfer function of the interface circuit is
I
O
Vs
(s)
+
s
2R
S
1
)
C
1
C
2
s
)
1
2R
S
C
1
) C
2
.
This transfer function contains a zero at DC and a pole at s
+
1
2R
S
C
1 )
C
2
. The transconductance is
constant at
1
2R
S
1
)
C
1
C
2
, above the pole frequency, providing a controllable AC current source. This circuit
also properly terminates the network analyzer with 50
at high frequencies. The second requirement for this
current source is to provide the desired output impedance, emulating the output impedance of a photodiode or
other current source. The output impedance of this circuit is given by
Z
O
(s)
+
C
1 ) C2
C
1C2
s
)
1
2Rs C1 ) C2
s s
)
1
2RsC1
.
Assuming C1 >> C2, the equation reduces to ZO [
1
sC
2
,
giving the appearance of a capacitive source at higher
frequency.
Capacitor values should be chosen to satisfy two requirements. First, C2 should represent the anticipated
capacitance of the true source. C1 should then be chosen such that the corner frequency of the
transconductance network is much less than the transimpedance bandwidth of the circuit. Choosing this corner
frequency properly leads to more accurate measurements of the transimpedance bandwidth. If the interface
circuit’s corner frequency is too close to the bandwidth of the circuit, determining the power level in the flatband
is difficult. A decade or more of flat bandwidth provides a good basis for determining the proper transimpedance
bandwidth.
相關(guān)PDF資料
PDF描述
THS4601CDDAR 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
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THS4601CDR 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
THS4601CD 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
THS4601IDDAR 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
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