參數(shù)資料
型號(hào)： CLC522ALC
廠商： COMLINEAR CORP
元件分類(lèi)： 模擬信號(hào)調(diào)理
英文描述： Wideband Variable-Gain Amplifier
中文描述： SPECIALTY ANALOG CIRCUIT, UUC14
文件頁(yè)數(shù)： 4/8頁(yè)
文件大?。?/td> 281K
代理商： CLC522ALC
Theory of Operation
The CLC522 is a linear wideband variable-gain amplifier
as illustrated in Fig 1. A voltage input signal may be
applied differentially between the two inputs (+V
in
, -V
in
),
or single-endedly by grounding one of the unused inputs.
The CLC522 input buffers convert the input voltage to a
current (I
Rg
) that is a function of the differential input
voltage (V
input
=+V
in
- -V
in
) and the value of the gain-
setting resistor (R
g
). This current (I
Rg
) is then mirrored to
a gain stage with a current gain of 1.85. The voltage-
controlled two-quadrant multiplier attenuates this current
which is then converted to a voltage via the output
amplifier. This output amplifier is a current-feedback op
amp configured as a transimpedance amplifier. It's tran-
simpedance gain is the feedback resistor (R
f
). The input
signal, output, and gain control are all voltages. The
output voltage can easily be calculated as seen in Eq. 1.
V
out
R
g
2
Eq. 1
Fig. 1
Phase
Negative Sync
Phase
Positive Sync
Gain
Positive Sync
Gain
Negative Sync
4.43 MHz
A
v
max
= +10
V
g
= 1.0V
Number of 150
Loads
2nd Harmonic Distortion vs. P
out
D
D
Differential Gain and Phase
1
4
.25
.20
.15
.10
.05
0
.25
.20
.15
.10
.05
0
50MHz
20MHz
10MHz
5MHz
-4
-2
0
2
4
6
8
10
Output Power (Pout, dBm)
-35
-40
-45
-50
-55
-60
-65
-70
-75
-80
-85
D
1.1V
50
P
o
50
1k
50
50
20
182
R
f
V
g
522
50MHz
20MHz
10MHz
5MHz
-4
-2
0 2
Output Power (Pout, dBm)
4
6
8
10
-35
-40
-45
-50
-55
-60
-65
-70
-75
-80
-85
D
3rd Harmonic Distortion vs. P
out
V
g
1.1V
50
50
1k
50
50
20
182
R
f
522
P
o
Input
Limited
R
f
= 900
Output
Limited
R
f
= 1.4k
0
100
Frequency (MHz)
20
19
18
17
16
15
14
13
12
11
10
-
-1dB Compression at Maximum Gain
P
o
P
i
50
R
g
R
f
50
50
20
50
522
CLC522TypicalPerformance
(T
A
=+25
°
C, V
cc
=
±
5V, A
v
=+10, V
g
=1.1V, R
L
=100
; unless noted)
Phase, V
g
= 0.0V
Phase, V
g
= 1.0V
Gain, V
g
= 0.0V
Gain, V
g
= 1.0V
4.43 MHz
Positive Sync
A
vmax
= +2
Number of 150
Loads
D
D
Differential Gain and Phase
1
2
3
4
.10
.08
.06
.04
.02
0
.10
.08
.06
.04
.02
0
0
10
20
MaximumGain Setting, AVmax(V/V)
30
40
50
60
70
80
90 100
100
10
1
V
√
H
Input Referred Voltage Noise vs A
Vmax
V
I
R
g
f
=
+
185
.
1
sin
.
ce I
V
R
A
R
R
V
R
input
g
v
f
g
g
g
=
=
+
185
1
2
Eq. 2
The gain of the CLC522 is therefore a function of three
external variables; R
g
, R
f
and V
g
as expressed in Eq. 2.
The gain-control voltage (V
g
) has a ideal input range of
-1V
≤
V
g
≤
+1V. At V
g
=+1V, the gain of the CLC522 is at
its maximum as expressed in Eq. 3.
R
V
g
Notice also that Eq. 3 holds for both differential and
single-ended operation.
A
R
f
max
.
=
185
Eq. 3
Choosing R
f
and R
g
R
g
is calculated from Eq.4.
V
input
max
is the maximum peak
V
input
=
R
I
g
Rg
max
max
Eq. 4
input voltage (V
pk
) determined by the application.
I
Rg
max
is the maximum allowable current through R
g
and is
typically 1.8mA. Once
A
V
max
is determined from the
minimum input and desired output voltages, R
f
is then
determined using Eq. 5. These values of R
f
and R
g
are
1
R
R
A
f
g
V
=
185
.
max
Eq. 5
the minimum possible values that meet the input voltage
and maximum gain constraints. Scaling the resistor
values will decrease bandwidth and improve stability.
Application Discussion
http://www.national.com
4
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