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CS3001 Arkusz danych(PDF) 11 Page - Cirrus Logic

Numer części CS3001
Szczegółowy opis  Precision Low-voltage Amplifier; DC to 2 kHz
Download  16 Pages
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Producent  CIRRUS [Cirrus Logic]
Strona internetowa  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS3001 Arkusz danych(HTML) 11 Page - Cirrus Logic

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CS3001
CS3002
DS490F9
11
The loop gain plot shown in Figure 18 illustrates
the unity gain configuration, and indicates how this
is modified when using the amplifier in a higher
gain configuration with compensation. If it is con-
figured for higher gain, for example, 60 dB, the
x–axis will move up by 60 dB (line B). Capacitor
C2 adds a zero and a pole. The modified plot indi-
cates the effects of introducing the pole and zero
due to capacitor C2. The pole can be located at any
frequency higher than the hand-over frequency, the
zero has to be at a frequency lower than the hand-
over frequency so as to provide adequate gain mar-
gin. The separation between the pole and the zero
is governed by the closed loop gain. The zero (z1)
occurs at the intersection of the –100 dB/decade
and –80 dB/decade slopes. The point X in the fig-
ure should be at closed loop gain plus 20 dB gain
margin. The value for C2 = 1/(2
π R1 P1). Setting
the pole of the filter to P1 = 1 MHz works very well
and is independent of gain. As the closed loop gain
is changed, the zero location is also modified if R1
remains fixed. Capacitor C2 can be increased in
value to limit the amplifier’s rising noise above
2kHz.
-100 dB/dec
-80 dB/dec
z
1
p
1
Margin
-20 dB/dec
50kHz
1MHz
5MHz
Desired Closed
Loop Gain
X
FREQUENCY
B
Figure 18. Loop Gain Plot: Unity Gain and with Pole-zero Compensation


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