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Output Impedance (ohms)
1
0.1
0:01
0.001
1Hz
Specification
' /
10
100
~
/
'//.
V///,
r/1
)/
~
/
'/}
1
/v
-
v
1kHz
10
100
Frequency
27f00
7
Fig.4.3. Output Impedance. "Low" Impedance Mode
Output Impedance (ohms)
1000
v
-
~
/
/
1.--
"
--
..........
~
v
~~
""
"
High-Z Terminal
shorted
100
/
r/r/
/ / / / , . . . ; ;
r~
"
""
)
~
Specifica
t
ion
r-....
'l
I
.
10
/
w.
////
~'/0;:
"~
"
"
....
"
"
~
"
1'
1Hz
10
100
1kHz
10
100
Frequency
t7fOt7B
Fig.4.4. Output Impedance. "High" Impedance Mode
4.4. POWER AMPLIFIER
The power amplifier is a complementary connected stage operating in
class B. The standing current is small, ensuring very low cross-over distort-
ion. Each complementary half of the output stage is a special form of the
Darlington connection, using complementary transistors, and having a very
low output impedance.
33
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