CWB308 / CWB309
CORPORATION
DISTORTION -VS- FREQUENCY
V+
C
Total Harmonic Distortion (%)
0.80
0.50
0.20
0.10
TOTAL HARMONIC DISTORTION
-VS-
FREQUENCY
V-, V+ = +10V Vanalog = 1.0Vrms
_
V-, V+ = +15V Vanalog = 1.0Vrms
_
V-, V+ = +15V Vanalog = 0.3Vrms
_
HP
GENERATOR
(or equivalent)
D
50
Ω
LOGIC 1 = +5V
HP
SPECTRUM
ANALYSER
(or equivalent)
S
T
A
= +25
o
C
0.05
10
20
f - Frequency (MHz)
40
50
Ω
C
HARMONIC DISTORTION
C = 0.22
µ
F // 10
µ
F
V-
10MHz - 40MHz
DISTORTION
-VS-
ANALOG INPUT VOLTAGE
10.0
5.0
V- = -15V, V+ = +15V
f = 10KHz, R
L
= 50
Ω
Total Harmonic
T
A
= +25
o
C
Distortion (%)
2.0
1.0
0.3
0.1
0.05
0.02
Compensated
0.3
1.0
Vanalog - Analog Input (Vrms)
3.0
5.0
POWER SUPPLY REJECTION RATIO POWER SUPPLY DECOUPLING CIRCUIT
.22
µ
F
1K
Ω
V+
POWER SUPPLY REJECTION RATIO
-VS-
FREQUENCY
90
-PSRR, +PSRR with Decoupling
PSRR - Power Supply
Rejection Ratio (dB)
80
70
60
V- = 15V, V+ = +15V
50
40
V
MOD
= 4.0V -f-p
CWB309CP T
A
= +25
o
C
0.2
0.5
1.0
2.0
5.0
10.0
20
+PSRR
-PSRR
w/o Decoupling
IN
IL
LT
S
D
.22
µ
F
1K
Ω
V-
30
0.1
f - Frequency (MHz)
By inserting 1K ohm resistors in series with V+ and V-
power supply lines and decoupling both pins at the device
socket, it is possible to improve power supply rejection
ratios of a video switch by 50dB at frequencies of 20MHz
and higher.
CALOGIC [ CALOGIC, LLC ]
