参数资料
型号: AD600AR
厂商: Analog Devices Inc
文件页数: 10/33页
文件大小: 0K
描述: IC AMP VGA DUAL LN 50MA 16SOIC
标准包装: 1
系列: X-AMP®
放大器类型: 可变增益
电路数: 2
转换速率: 275 V/µs
-3db带宽: 35MHz
电流 - 输入偏压: 350nA
电流 - 电源: 11mA
电流 - 输出 / 通道: 50mA
电压 - 电源,单路/双路(±): ±4.75 V ~ 5.25 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-SOIC(0.295",7.50mm 宽)
供应商设备封装: 16-SOIC W
包装: 管件
AD600/AD602
LOW NOISE AGC AMPLIFIER WITH 80 dB GAIN
RANGE
This is a Class AB amplifier. As VIN increases in a positive
direction, Q1 conducts more heavily and its re becomes lower
while Q2 increases. Conversely, increasingly negative values of
VIN result in the re of Q2 decreasing, while the re of Q1 increases.
The design is chosen such that the net emitter resistance is
essentially independent of the instantaneous value of VIN,
resulting in moderately low distortion. Low values of resistance
and moderately high bias currents are important in achieving
the low noise, wide bandwidth, and low distortion of this
preamplifier. Heavy decoupling prevents noise on the power
supply lines from being conveyed to the input of the X-AMP.
Figure 37 provides an example of the ease with which the
AD600 can be connected as an AGC amplifier. A1 and A2 are
cascaded, with 6 dB of attenuation introduced by the 100 Ω
Resistor R1, while a time constant of 5 ns is formed by C1 and
the 50 Ω of net resistance at the input of A2. This has the dual
effect of lowering the overall gain range from 0 dB to +80 dB to
6 dB to +74 dB and introducing a single-pole, low-pass filter
with a 3 dB frequency of about 32 MHz. This ensures stability
at the maximum gain for a slight reduction in the overall
bandwidth. The C4 capacitor blocks the small dc offset voltage
at the output of A1 (which may otherwise saturate A2 at its
maximum gain) and introduces a high-pass corner at about
8 kHz, useful in eliminating low frequency noise and spurious
signals that can be present at the input.
Table 4. Measured Preamplifier Performance
Measurement
Value
Unit
Gain (f = 30 MHz)
6
dB
Bandwidth (3 dB)
250
MHz
Input Signal for 1 dB Compression
1
V p-p
Distortion
VIN = 200 mV p-p
HD2
0.27
%
HD3
0.14
%
VIN = 500 mV p-p
HD2
0.44
%
HD3
0.58
%
System Input Noise
1.03
nV/√Hz
Spectral Density (NSD)
(Preamp Plus X-AMP)
Input Resistance
1.4
Input Capacitance
15
pF
Input Bias Current
±150
μA
Power Supply Voltage
±5
V
Quiescent Current
15
mA
Rev. F | Page 17 of 32
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
REF
A1
A2
+
+
AD600
C1HI
A1CM
A1OP
VPOS
VNEG
A2OP
A2CM
C2HI
C1LO
A1HI
A1LO
GAT1
GAT2
A2LO
A2HI
C2LO
R1
100
C4
0.1F
C1
100pF
+5V
R3
46.4k
R4
3.74k
RF
INPUT
C3
15pF
AD590
+5V
Q1
2N3904
FB
+5V
–5V
+5V DEC
–5V DEC
0.1F
POWER SUPPLY
DECOUPLING NETWORK
RF
OUTPUT
+5V DEC
–5V DEC
+
VPTAT
VG
300A
(AT 300K)
C2
1F
R2
806
1%
00
53
8-
03
5
Figure 37. This Accurate HF AGC Amplifier Uses Three Active Components
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