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參數(shù)資料
| 型號(hào)： | RSLIC18 |
| 廠商： | Intersil Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁(yè)數(shù)： | 5/10頁(yè) |
| 文件大?。?/td> | 115K |
| 代理商： | RSLIC18 |
4-5
The voltage controlled voltage source converts the single
ended AC voltage source to a differential driver for the 2-wire
interface. The 4-wire output voltage is measured at the
transmit output, VTX, of the device. A dB voltage probe was
used to measure the magnitude and a phase voltage probe
was used to measure the phase of the frequency response.
EXPECTED RESULTS
The G
24
results are predicted using the voltage divider
relationship shown below.
The magnitude of the frequency response in the voice band,
300Hz to 3400Hz, should be approximately -7.1dB and the
phase should be nearly 180 degrees.
G
44
Simulation
The G
44
frequency response of the device is simulated
using the circuit of Figure 11.
The VRX input of the mode is driven by an AC voltage
source. The 4-wire output voltage is measured at the
transmit output, VTX, of the device. A dB voltage probe was
used to measure the magnitude and a phase voltage probe
was used to measure the phase of the frequency response.
EXPECTED RESULTS
The G
44
results are predicted using the voltage divider
relationship shown below.
The magnitude of the frequency response in the voice band,
300Hz to 3400Hz, should be approximately -7.1dB and the
phase should be nearly 180 degrees.
Simulation Example - Complex Load
Most international telephony transmission requirements are
defined around a complex 2-wire impedance. The most
widely recognized form of the complex network is shown
below as well as the device synthesis network to match the
impedance.
This simulation example will use the 2-wire complex network
for China which is defined as R
1
= 200
, R
2
= 680
and
C
2
= 100nF.
Device Impedance Synthesis
When matching the device to a complex load the sum of the
protection resistance is subtracted from the series resistor
R
1
. The other components remain unchanged. The general
form of the design equation is shown below.
Substituting actual component values results in the complex
network to be synthesized by the device.
Typically the load impedance represents a combination of
loop length and phone impedance, therefore a separate term
for the loop length (ohms/foot) is not required.
The external resistor, R
S
, which programs the synthesized
impedance now takes the form of the complex network
defined by R
1S
, R
2S
and C
2S
.
The resistor value used in the application circuit will be the
standard component value nearest to the calculated value.
G
42
Simulation
The G
42
frequency response of the device can be simulated
using the circuit of Figure 13.
G
24
Z
–
P
L
O
+
-------+
)
530
+
----------+
0.441
–
=
=
=
(EQ.11)
FIGURE 11. G
44
RESISTIVE LOAD SIMULATION CIRCUIT
600
470nF
TIP
RING
VRX
VTX
-IN
VFB
RSLIC18 MODEL
35
35
212k
470nF
G
44
Z
–
P
L
O
+
-------+
)
530
+
----------+
0.441
–
=
=
=
(EQ.12)
FIGURE 12. TYPICAL COMPLEX IMPEDANCE NETWORK
2-WIRE
NETWORK
R
1
R
2
C
2
SYNTHESIS
NETWORK
C
2S
R
1S
R
2S
Z
O
Z
L
2R
P
–
R
1
R
2
C
2
||
+
(
)
2 R
P
)
–
=
=
(EQ. 13)
Z
O
200
680 100n
+
(
)
2 35
)
130
680
100n
||
+
=
–
=
(EQ. 14)
R
1S
400 R
1
2R
P
–
)
400 130
)
52k
=
=
=
(EQ. 15)
R
2S
400 R
2
)
400 680
)
272k
=
=
=
(EQ. 16)
C
2S
C
2
---------
-------------
250pF
=
=
=
(EQ. 17)
FIGURE 13. G
42
COMPLEX LOAD SIMULATION CIRCUIT
+
-
+
-
470nF
G = 1
TIP
RING
VRX
VTX
-IN
VFB
RSLIC18 MODEL
35
35
272K
470nF
10M
200
100n
680
250p
52K
Application Note 9824
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