User manual
page 41
Analog System Lab Kit PRO
6.5 Exercise Set 6
6.4 What should you submit
experiment 6
Figure 6.3: Voltage-Controlled Oscillator (VCO)
Table 6.1: Change in frequency as a function of Control Voltage
Simulate the circuits and obtain the Transient response of the system.
C
R1
VC
R1
R2
1
2
3
Take the plots of time response from oscilloscope and compare it with
simulation results.
VarythecontrolvoltageoftheVCOandseetheeectonthefrequencyof
the output waveform also measure the sensitivity (KVCO) of the VCO which is
nothing but
1
1
V
fRCRR
f
RC VR
VR
K
dV
df
RC VV
R
Vc
f
Hz Volts
fRCRR
kHz
RC
RR
V
K
dV
df
V
kHz
kHz
14
4
4
14
1
4
1
10
21
1
2
1
2
21
ss
r
c
VCO
c
r
c
VCO
c
21
!
$
$$$
$
$
$
#
=
== =
=
=
l
l
__
__
_
ii
ii
i
. Use Table 6.1 to note your readings.
Apply 1V, 1kHz square wave over 2V DC and observe the FSK for a VCO which is
designed for 10kHz frequency.
S.No. Control Voltage (Vc) Change in Frequency
1
2
3
4
Notes on Experiment 6: