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ANIL NEERUKONDA INSTITUTE OF TECHNOLOGY & SCIENCES(A)
Department of Electronics and Communication Engineering
ECE 216 Electronic circuits and Analysis-I
➢Academic year : 2020-21
➢Class & Section : 2/4 ECE-C
➢Name of the Faculty : Mr.D.Anil Prasad
ANIL PRASAD DADI/DEPT OF ECE/ANITS
ANIL NEERUKONDA INSTITUTE OF TECHNOLOGY & SCIENCES(A)
Department of Electronics and Communication Engineering
Non Linear Wave shaping circuits
Clamping circuits
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Clamping circuits
• The circuit which is used to add DC level as per requirement in
the output of the AC signal.
• The clamper circuit is also called as DC restorer or DC inserter
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Clamping circuits
Types of Clamping circuits:
1. Positive clamper
2. Negative clamper
ANIL PRASAD DADI/DEPT OF ECE/ANITS
-Vm
Positive Clamper circuit
Positive
clamper
t0
Vm
V0
t0
Vm
2 Vm
Vi
V0=Vi +Vm
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Negative Clamper circuit
Negative
clamper
t0
Vm
-Vm
V0
t0
Vm
2 Vm
Vi
V0=Vi -Vm
-Vm
-2 Vm
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Analysis of Positive clamper circuit
using
ideal diode model
ANIL PRASAD DADI/DEPT OF ECE/ANITS
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
RL
VC=0
-
+
-
V0Vi
VC(0
-)=0=VC(0+) Capacitor is initially uncharged
+
-
Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
RL
VC=0
-
+
-
V0Vi
0<t<T/4
VC(0
-)=0=VC(0+) Capacitor is initially uncharged
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Diode is reverse biased
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
RL
C
-
+
-
V0Vi
𝑉𝑐
𝑇
4
−
= 𝑉𝑐
𝑇
4
+
=0V
τ=RthC=RLC
RLC>>T, Time period of input signal
ANIL PRASAD DADI/DEPT OF ECE/ANITS
0<t<T/4
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
0<t<T/4
RL
VC=0
-
+
-
V0Vi
V0=Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
T/4<t<T/2
RL
VC=0
-
+
-
V0Vi
+
-
Vi
𝑉𝑐
𝑇
4
−
= 𝑉𝑐
𝑇
4
+
=0V
ANIL PRASAD DADI/DEPT OF ECE/ANITS
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
RL
VC=0
-
+
-
V0Vi
T/4<t<T/2 Diode is reverse biased
ANIL PRASAD DADI/DEPT OF ECE/ANITS
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
RL
C
-
+
-
V0Vi
𝑉𝑐
𝑇
2
−
= 𝑉𝑐
𝑇
2
+
=0V
τ=RthC=RLC
RLC>>T, Time period of input signal
ANIL PRASAD DADI/DEPT OF ECE/ANITS
T/4<t<T/2
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
T/4<t<T/2
RL
VC=0
-
+
-
V0Vi
V0=Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
T/2<t<3T/4
RL
VC=0
-
+
-
V0Vi
+
-
Vi
𝑉𝑐
𝑇
2
−
= 𝑉𝑐
𝑇
2
+
=0V
ANIL PRASAD DADI/DEPT OF ECE/ANITS
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
T/2<t<3T/4
RL
-
+
-
V0Vi
i
VC
+-
τ=RthC=0
VC= -Vi 𝑉𝑐
3𝑇
4
−
= 𝑉𝑐
3𝑇
4
+
=+Vm
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Diode is forward biased
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
T/2<t<3T/4
RL
-
+
-
V0Vi
i
VC
+-
V0=0
ANIL PRASAD DADI/DEPT OF ECE/ANITS
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
3T/4<t<T
RL
-
+
-
V0Vi
VC
+-
𝑉𝑐
3𝑇
4
−
= 𝑉𝑐
3𝑇
4
+
=+Vm
V0=VD=VC+Vi VD =Vm+Vi
+
-
VD
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Let Vm=10V
10-9.9
10-9.8
….
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
tT
3𝑇
4
3T/4<t<T
RL
-
+
-
V0Vi
Vm
+-
Diode is reverse biased
V0=Vm+Vi ANIL PRASAD DADI/DEPT OF ECE/ANITS
2Vm
𝑇
4
𝑇
2
T
τ=RthC=RLC
RLC>>T, Time period of input signal
Problem #1(Assume ideal diode)
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Analysis of Negative clamper circuit
using
ideal diode model
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Vi
RL
C
Negative Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
0<t<T/4
VC(0
-)=0=VC(0+) Capacitor is initially uncharged
+
RL
VC=0
-
+
-
Vi
+
-
ANIL PRASAD DADI/DEPT OF ECE/ANITS
RL
C
Negative Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
0<t<T/4
VC(0
-)=0=VC(0+) Capacitor is initially uncharged
+
RL
-
+
-
Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Diode is forward biased
-VC+
i
-
RL
C
Negative Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
0<t<T/4
+
RL
VC
-
+
-
Vi
i
+
τ=RthC=0
𝑉𝑐
𝑇
4
−
= 𝑉𝑐
𝑇
4
+
=+Vm
VC= Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
-
RL
C
Negative Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
0<t<T/4
+
RL
VC
-
+
-
Vi
i
+V0=0
ANIL PRASAD DADI/DEPT OF ECE/ANITS
VD
-
RL
C
Negative Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
T/4<t<T/2
+
RL
VC
-
+
-
Vi
+𝑉𝑐
𝑇
4
−
= 𝑉𝑐
𝑇
4
+
=+Vm
VD= -VC+Vi
+
-
V0
Let Vm=10V
ANIL PRASAD DADI/DEPT OF ECE/ANITS
-10+9.9
-10+9.8
….
VD= -Vm+Vi
-
RL
C
Negative Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
T/4<t<T/2
+
RL
Vm
-
+
-
Vi
+
V0
V0= Vi - Vm
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Diode is reverse biased
𝑇
4
τ=RthC=RLC
RLC>>T, Time period of input signal
Problem #1(Assume ideal diode)
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Analysis of Positive clamper circuit
using
diode equivalent resistance
model
ANIL PRASAD DADI/DEPT OF ECE/ANITS
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
RL
VC=0
-
+
-
V0Vi
VC(0
-)=0=VC(0+) Capacitor is initially uncharged
+
-
Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
RL
VC=0
-
+
-
V0Vi
0<t<T/4
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Rr
Diode is in Reverse bias
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
RL
-
+
-
V0Vi
0<t<T/4
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Rr
𝑉𝑐
𝑇
4
−
= 𝑉𝑐
𝑇
4
+
=0V
τ=RthC=(Rr||RL)C
RLC>>T, Time period of input signal
τ=RLC
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
0<t<T/4
RL
-
+
-
V0Vi
V0=Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Rr
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
T/4<t<T/2
RL
-
+
-
V0Vi
+
-
Vi
𝑉𝑐
𝑇
4
−
= 𝑉𝑐
𝑇
4
+
=0V
ANIL PRASAD DADI/DEPT OF ECE/ANITS
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
RL
-
+
-
V0Vi
T/4<t<T/2
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Rr
Diode is in Reverse bias
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
RL
-
+
-
V0Vi
T/4<t<T/2
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Rr
𝑉𝑐
𝑇
2
−
= 𝑉𝑐
𝑇
2
+
=0V
RLC>>T, Time period of input signal
τ=RthC=(Rr||RL)C τ=RLC
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
T/4<t<T/2
RL
-
+
-
V0Vi
V0=Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Rr
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
T/2<t<3T/4
RL
VC=0
-
+
-
V0Vi
+
-
Vi
𝑉𝑐
𝑇
2
−
= 𝑉𝑐
𝑇
2
+
=0V
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Rf
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
T/2<t<3T/4
RL
-
+
-
V0Vi
i
VC
+-
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Diode is forward biased
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
T/2<t<3T/4
RL
-
+
-
V0Vi
i
VC
+-
VC= -Vi 𝑉𝑐
3𝑇
4
−
= 𝑉𝑐
3𝑇
4
+
=+Vm
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Rf
RfC<<T, Time period of input signal
τ=RthC=(Rf||RL)C=RfC
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
T/2<t<3T/4
RL
-
+
-
V0Vi
i
VC
+-
V0 ≈ 0
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Rf
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
3T/4<t<T
RL
-
+
-
V0Vi
VC
+-
𝑉𝑐
3𝑇
4
−
= 𝑉𝑐
3𝑇
4
+
=+Vm
V0=VD=VC+Vi VD =Vm+Vi
+
-
VD
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Let Vm=10V
10-9.9
10-9.8
….
+
RL
C
Positive Clamper circuit
+
-
+
-
V0Vi
3T/4<t<T
RL
-
+
-
V0Vi
Vm
+-
Diode is reverse biased
V0=Vm+Vi ANIL PRASAD DADI/DEPT OF ECE/ANITS
Rr
Vi(t)
tT
3𝑇
4
2Vm
𝑇
4
𝑇
2
T
RLC>>T, Time period of input signal
τ=RthC=(Rr||RL)C τ=RLC
Analysis of Negative clamper circuit
using
diode equivalent resistance
model
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Vi
RL
C
Negative Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
VC(0
-)=0=VC(0+) Capacitor is initially uncharged
+
RL
VC=0
-
+
-
Vi
+
-
ANIL PRASAD DADI/DEPT OF ECE/ANITS
RL
C
Negative Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
0<t<T/4
VC(0
-)=0=VC(0+) Capacitor is initially uncharged
+
RL
-
+
-
Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
RfDiode is forward biased
-
RL
C
Negative Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
0<t<T/4
+
RL
VC
-
+
-
Vi
i
+
𝑉𝑐
𝑇
4
−
= 𝑉𝑐
𝑇
4
+
=+VmVC= Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Rf
τ=RthC=(Rf||RL)C=RfC
RfC<<T, Time period of input signal
-
RL
C
Negative Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
0<t<T/4
+
RL
VC
-
+
-
Vi
i
+V0 ≈ 0
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Rf
VD
-
RL
C
Negative Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
T/4<t<T/2
+
RL
VC
-
+
-
Vi
+𝑉𝑐
𝑇
4
−
= 𝑉𝑐
𝑇
4
+
=+Vm
VD= -VC+Vi
+
-
V0
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Let Vm=10V
-10+9.9
-10+9.8
….
VD= -Vm+Vi
-
RL
C
Negative Clamper circuit
+
-
+
-
V0Vi
T/4<t<T/2
+
RL
Vm
-
+
-
Vi
+
V0
V0= Vi - Vm
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Rr
Diode is reversed biased
Vi(t)
t𝑇
2
T𝑇
4
𝑇
4
3𝑇
4
-2Vm
RLC>>T, Time period of input signal
τ=RthC=(Rr||RL)C τ=RLC
Analysis of Positive clamper circuit
using
Constant voltage drop model
ANIL PRASAD DADI/DEPT OF ECE/ANITS
-
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
RL
VC=0
-
+
-
V0Vi
VC(0
-)=0=VC(0+) Capacitor is initially uncharged
+
Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Vγ
-
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
0<t<T/4
RL
VC=0
-
+
-
V0Vi
VC(0
-)=0=VC(0+) Capacitor is initially uncharged
+
Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
VγDiode is reverse biased
-
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
RL
VC=0
-
+
-
V0Vi
+
Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Vγ
𝑉𝑐
𝑇
4
−
= 𝑉𝑐
𝑇
4
+
=0V
τ=RthC=RLC
RLC>>T, Time period of input signal
0<t<T/4
-
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
RL
VC=0
-
+
-
V0Vi
+
Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Vγ
0<t<T/4 V0=Vi
-
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
T/4<t<T/2
RL
VC=0
-
+
-
V0Vi
𝑉𝑐
𝑇
4
−
= 𝑉𝑐
𝑇
4
+
=0V
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Vγ
+
Vi
-
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
T/4<t<T/2
RL
VC=0
-
+
-
V0Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Vγ
+
Vi
Diode is reverse biased
-
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
T/4<t<T/2
RL
VC=0
-
+
-
V0Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Vγ
+
Vi
𝑉𝑐
𝑇
2
−
= 𝑉𝑐
𝑇
2
+
=0V
τ=RthC=RLC
RLC>>T, Time period of input signal
-
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
T/4<t<T/2
RL
VC=0
-
+
-
V0Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Vγ
+
Vi
V0=Vi
-
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
RL
VC=0
-
+
-
V0Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Vγ
+
Vi
T/2<t<3T/4 𝑉𝑐
𝑇
2
−
= 𝑉𝑐
𝑇
2
+
=0V
-
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
RL
VC
-
+
-
V0Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Vγ
+
Vi
T/2<t<3T/4
τ=RthC=0
VC +Vi +Vγ=0
𝑉𝑐
3𝑇
4
−
= 𝑉𝑐
3𝑇
4
+
= Vm -Vγ
-
i
Diode is in forward bias for Vi>- Vγ
VC =-(Vi +Vγ)
-
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
RL
VC
-
+
-
V0Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Vγ
+
Vi
T/2<t<3T/4
-
i
V0= -Vγ
Vγ
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
3T/4<t<T
RL
-
+
-
V0Vi
VC
+-
𝑉𝑐
3𝑇
4
−
= 𝑉𝑐
3𝑇
4
+
= Vm -Vγ VC+Vi+Vγ-VD=0
VD=VC+ Vγ +Vi Let Vm=10V
+
-
VD
ANIL PRASAD DADI/DEPT OF ECE/ANITS
10-9.9
10-9.8
….
VD= Vm -Vγ + Vγ +Vi
VD= Vm +Vi
Vγ
+
RL
C
Positive Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t
𝑇
2
T𝑇
4
3𝑇
4
3T/4<t<T
RL
-
+
-
V0Vi
Vm -Vγ
+-
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Diode is reverse biased
V0=VC+Vi V0= Vm -Vγ +Vi
2Vm- Vγ
τ=RthC=RLC
RLC>>T, Time period of input signal
Analysis of Negative clamper circuit
using
Constant voltage drop model
ANIL PRASAD DADI/DEPT OF ECE/ANITS
-
Vi
RL
C
Negative Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
VC(0
-)=0=VC(0+) Capacitor is initially uncharged
+
RL
VC=0
-
+
-
Vi
+
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Vγ
Vγ
-
RL
C
Negative Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
0<t<T/4
VC(0
-)=0=VC(0+) Capacitor is initially uncharged
+
RL
VC=0
-
+
-
Vi
+
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Diode is forward biased for Vi> Vγ
VC
Vγ
-
RL
C
Negative Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
+
RL
-
+
-
Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
0<t<T/4 τ=RthC=0
𝑉𝑐
𝑇
4
−
= 𝑉𝑐
𝑇
4
+
=Vm –Vγ
VC-Vi +Vγ=0 VC=Vi –Vγ
VC
Vγ
-
RL
C
Negative Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
+
RL
-
+
-
Vi
ANIL PRASAD DADI/DEPT OF ECE/ANITS
0<t<T/4 V0=Vγ
-
VD
-
RL
C
Negative Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t𝑇
2
T𝑇
4
3𝑇
4
T/4<t<T/2
+
RL
VC
-
+
-
Vi
+𝑉𝑐
𝑇
4
−
= 𝑉𝑐
𝑇
4
+
= Vm –Vγ
-VC+Vi –Vγ-VD=0
+
V0
Let Vm=10V
ANIL PRASAD DADI/DEPT OF ECE/ANITS
VγVD =-VC –Vγ +Vi -10+9.9
-10+9.8
….VD =-Vm +Vγ–Vγ +Vi
VD =-Vm +Vi
-
RL
C
Negative Clamper circuit
+
-
+
-
Vi(t)
0
V0Vi
t
𝑇
2
T
3𝑇
4
T/4<t<T/2
+
RL
VC
-
+
-
Vi
+
V0
ANIL PRASAD DADI/DEPT OF ECE/ANITS
Vγ
V0= Vi - VC
Diode is reverse biased
V0= Vi - Vm +Vγ
𝑇
4
-2Vm+Vγ
τ=RthC=RLC
RLC>>T, Time period of input signal
Thank you
For Watching
ANIL PRASAD DADI/DEPT OF ECE/ANITS
ANIL NEERUKONDA INSTITUTE OF TECHNOLOGY & SCIENCES(A)
Department of Electronics and Communication Engineering

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Clamping circuits|Dept of ECE| ANITS