Friday 26 April 2013
INPUT AND OUTPUT IMPEDANCE OF FEEDBACK CIRCUITS
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TYPES OF FEEDBACK
1) VOLTAGE – SHUNT or SHUNT- SHUNT FEEDBACK
2) VOLTAGE – SERIES or SERIES – SHUNT FEEDBACK
3) CURRENT – SERIES or SERIES – SERIES FEEDBACK
4) CURRENT – SHUNT or SHUNT –SERIES FEEDBACK
|
INPUT
|
OUTPUT
|
|
SHUNT
|
SHUNT
|
|
SERIES
|
SHUNT
|
|
SERIES
|
SERIES
|
|
SHUNT
|
SERIES
|
NOTE: ASSUME SHUNT AS DECREASING AND
INPUT AND OUTPUT IMPEDANCE
|
TYPE OF FEEDBACK
|
INPUT
|
OUTPUT
|
|
VOLTAGE – SHUNT or
SHUNT- SHUNT FEEDBACK
|
DECREASING
|
DECREASING
|
|
VOLTAGE – SERIES or
SERIES – SHUNT FEEDBACK
|
INCREASING
|
DECREASING
|
|
CURRENT – SERIES or
SERIES – SERIES FEEDBACK
|
INCREASING
|
INCREASING
|
|
CURRENT – SHUNT or
SHUNT –SERIES FEEDBACK
|
DECREASING
|
INCREASING
|
By how much factor it is going to increase or decrease
The factor by how much it is going to increase or decrease
is ( 1+ Aβ
)
If RIN and R0 are input impedance and
output impedance before feedback, then after feedback
|
TYPE OF FEEDBACK
|
INPUT
|
OUTPUT
|
|
VOLTAGE – SHUNT or
SHUNT- SHUNT FEEDBACK
|
RIN /( 1+ Aβ
)
|
R0 / ( 1+ Aβ
)
|
|
VOLTAGE – SERIES or
SERIES – SHUNT FEEDBACK
|
RIN ( 1+ Aβ
)
|
R0 / ( 1+ Aβ
)
|
|
CURRENT – SERIES or
SERIES – SERIES FEEDBACK
|
RIN ( 1+ Aβ
)
|
R0 ( 1+ Aβ
)
|
|
CURRENT – SHUNT or
SHUNT –SERIES FEEDBACK
|
RIN / ( 1+ Aβ
)
|
R0 ( 1+ Aβ
)
|
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