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参数资料
| 型号： | 5962-9083501HXA |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 运算放大器 |
| 英文描述： | OP-AMP, 8000 uV OFFSET-MAX, MBCY12 |
| 封装： | METAL CAN, TO-8, 12 PIN |
| 文件页数： | 4/7页 |
| 文件大小： | 123K |
| 代理商： | 5962-9083501HXA |
DATA SHEET
KH205
4
REV. 1A February 2001
Current Feedback Amplifiers
Some of the key features of current feedback technology
are:
s
Independence of AC bandwidth and voltage gain
s
Adjustable frequency response with feedback resistor
s
High slew rate
s
Fast settling
Current feedback operation can be described using a simple
equation. The voltage gain for a non-inverting or inverting
current feedback amplifier is approximated by Equation 1.
Equation 1
where:
s
Av is the closed loop DC voltage gain
s
Rf is the feedback resistor
s
Z(j
ω) is the CLC205’s open loop transimpedance
gain
s
is the loop gain
The denominator of Equation 1 is approximately equal to
1 at low frequencies. Near the -3dB corner frequency, the
interaction between Rf and Z(jω) dominates the circuit
performance. The value of the feedback resistor has a
large affect on the circuits performance. Increasing Rf
has the following affects:
s
Decreases loop gain
s
Decreases bandwidth
s
Reduces gain peaking
s
Lowers pulse response overshoot
s
Affects frequency response phase linearity
Overdrive Protection
Unlike most other high-speed op amps, the KH205 is not
damaged by saturation caused by overdriving input
signals (where Vin x gain > max. Vo). The KH205 self
limits the current at the inverting input when the output is
saturated (see the inverting input current self limit
specification); this ensures that the amplifier will not be
damaged due to excessive internal currents during overdrive.
For protection against input signals which would exceed
either the maximum differential or common mode input
voltage, the diode clamp circuits below may be used.
Figure 1: Diode Clamp Circuits for Common Mode
and Differential Mode Protection
Short Circuit Protection
Damage caused by short circuits at the output may be
prevented by limiting the output current to safe levels.
The most simple current limit circuit calls for placing
resistors between the output stage collector supplies and
the output stage collectors (pins 12 and 10). The value of
this resistor is determined by:
where II is the desired limit current and RI is the minimum
expected load resistance (0
for a short to ground).
Bypass capacitors of 0.01
F on should be used on the
collectors as in Figures 2 and 3.
Figure 2: Recommended Non-Inverting Gain Circuit
Figure 3: Recommended Inverting Gain Circuit
A more sophisticated current limit circuit which provides
a limit current independent of RI is shown in Figure 4 on
page 5.
With the component values indicated, current limiting
occurs at 50mA. For other values of current limit (II),
select RC to equal Vbe/lI. Where Vbe is the base to
emitter voltage drop of Q3 (or Q4) at a current of [2VCC –
1.4] / Rx, where Rx ≤ [(2VCC – 1.4) / II] Bmin.
Also, Bmin is the minimum beta of Q1 (or Q2) at a current
of II. Since the limit current depends on Vbe, which is
temperature
dependent,
the
limit
current
is
likewise temperature dependent.
differential protection
KH205
+
-
common mode
protection
Rg
+Vcc
Vin
Vo
-Vcc
R
V
I
R
C
I
=
33
+15V
.1
3.9
.01
Capactance in
F
1
12
8
3,7
200
10
11
33
.01
.1
3.9
-15V
9
+
-
KH205
Vo
Rf = 2000
(internal)
6
Vin
5
Ri
50
Rg
A1
R
v
f
g
=+
33
+15V
.1
3.9
.01
Capactance in
F
1
12
8
5
Vin
3,7
200
10
Ri
11
33
.01
.1
3.9
-15V
9
+
-
KH205
Vo
Rf = 2000
(internal)
6
50
Rg
For Zin = 50
, select Rg||Ri = 50
A
-R
R
v
f
g
=
V
A
1
R
Zj
o
in
v
f
=
+ ()ω
Zj
Rf
ω
()
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