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參數(shù)資料
| 型號(hào)： | LM359 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Dual, High Speed, Programmable, Current Mode Norton Amplifiers |
| 中文描述： | 雙路，高速，可編程，電流模式諾頓放大器 |
| 文件頁(yè)數(shù)： | 11/24頁(yè) |
| 文件大?。?/td> | 742K |
| 代理商： | LM359 |
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Application Hints
(Continued)
3.
Determine maximum value for R
f
to provide stable DC
biasing
Optimum output DC level for maximum symmetrical swing
without clipping is:
R
f(MAX)
can now be found:
This value should not be exceeded for predictable DC bias-
ing.
4.
Select R
to be large enough so as not to appreciably
load the input termination resistance:
R
s
≥
750
; Let R
s
= 750
5.
Select R
f
for appropriate gain:
7.5 k
is less than the calculated R
f(MAX)
so DC predictability
is insured.
6.
Since R
= 7.5k, for the output to be biased to 5.1 V
DC
,
the reference current I
IN
(+) must be:
Now R
b
can be found by:
7.
Select C
to provide the proper gain for the 8 Hz mini-
mum input frequency:
A larger value of C
will allow a flat frequency response down
to 8 Hz and a 0.01 μF ceramic capacitor in parallel with C
i
will maintain high frequency gain accuracy.
8.
Test for peaking of the frequency response and add a
feedback “l(fā)ead” capacitor to compensate if necessary.
A NON-INVERTING VIDEO AMPLIFIER
For this case several design considerations must be dealt
with.
The output voltage (AC and DC) is strictly a function of
the size of the feedback resistor and the sum of AC and
DC “mirror current” flowing into the (+) input.
The amplifier always has 100% current feedback so ex-
ternal compensation is required. Add a small (1 pF–5 pF)
feedback capacitance to leave the amplifier’s open loop
response and slew rate unaffected.
To prevent saturating the mirror stage the total AC and
DC current flowing into the amplifier’s (+) input should be
less than 2 mA.
The output’s maximum negative swing is one diode
above ground due to the V
BE
diode clamp at the () input.
Final Circuit Using Standard 5%
Tolerance Resistor Values:
DS007788-18
Circuit Performance:
DS007788-19
V
o(DC)
= 5.1V
Differential phase error
<
1 for 3.58 MHz f
IN
Differential gain error
<
0.5% for 3.58 MHz f
IN
f
3 dB
low = 2.5 Hz
www.national.com
11
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