AD534–Applications Section
The versatility of the AD534 allows the creative designer to
implement a variety of circuits such as wattmeters, frequency
doublers and automatic gain controls to name but a few.
A
A–B
2
X
1
X
2
+V
S
+15V
2
2
OUTPUT = A – B
10V
MODULATION
INPUT, E
M
X
1
X
2
+V
S
+15V
E
M
E sin
10V
C
OUT
Z
1
OUTPUT = 1
t
SF
OUT
30k
Z
1
10k
Z
2
AD534
CARRIER
INPUT
E
C
sin t
Z
2
Y
1
Y
2
–V
S
–15V
SF
AD534
B
A+B
2
Y
1
Y
2
–V
S
–15V
THE SF PIN OR A Z-ATTENUATOR CAN BE USED TO PROVIDE OVERALL
SIGNAL AMPLIFICATION, OPERATION FROM A SINGLE SUPPLY POSSIBLE;
BIAS Y
2
TO V
S
/2.
Figure 8. Difference-of-Squares
Figure 11. Linear AM Modulator
CONTROL INPUT,
E
C
, ZERO TO 5V
SET
GAIN
1k
–V
S
X
1
X
2
+V
S
+15V
9k
X
1
X
2
1k
SF
Z
1
+V
S
+15V
OUTPUT = (100V)
(1% PER VOLT)
A–B
B
OUT
2k
SF
AD534
Z
1
39k
1k
Z
2
OUTPUT,
E E
=
C S
0.1V
0.005 F
12V PK
OUT
AD534
Z
2
B INPUT
(+V
E
ONLY)
Y
1
Y
2
–V
S
–15V
Y
1
SIGNAL INPUT,
E
S
, 5V PK
Y
2
–V
S
–15V
A INPUT
( )
NOTES:
1) GAIN IS X 10 PER-VOLT OF E
C
, ZERO TO X 50
2) WIDEBAND (10Hz – 30kHz) OUTPUT NOISE IS 3mV RMS, TYP
CORRESPONDING TO A.F.S. S/N RATIO OF 70dB
3) NOISE REFERRED TO SIGNAL INPUT, WITH E
C
= 5V, IS 60 V RMS, TYP
4) BANDWITH IS DC TO 20kHz, –3dB, INDEPENDENT OF GAIN
OTHER SCALES, FROM 10% PER VOLT TO 0.1% PER VOLT
CAN BE OBTAINED BY ALTERING THE FEEDBACK RATIO.
Figure 9. Voltage-Controlled Amplifier
Figure 12. Percentage Computer
X
1
X
2
18k
10k
+V
S
+15V
X
1
OUTPUT = (10V) sin
E
WHERE =
2
10V
X
2
+V
S
+15V
OUT
4.7k
Z
1
4.3k
Z
2
3k
AD534
SF
OUT
AD534
SF
Z
1
Z
2
INPUT, Y
10V FS
Y
1
Y
2
–V
S
–15V
OUTPUT,
= (10V)
5V/PK
y
1+y
Y
WHERE y =
(10V)
INPUT, E
0 TO +10V
Y
1
Y
2
–V
S
–15V
USING CLOSE TOLERANCE RESISTORS AND AD534L, ACCURACY
OF FIT IS WITHIN 0.5% AT ALL POINTS. IS IN RADIANS.
Figure 10. Sine-Function Generator
Figure 13. Bridge-Linearization Function
–8–
AD [ ANALOG DEVICES ]
