CA3060 Intersil, CA3060 Datasheet - Page 12

• Manufacturer Part Number: CA3060
• Description: 110kHz / Operational Transconductance Amplifier Array
• Manufacturer: Intersil

Figure 28 shows the actual circuit including all the adjust-
ments associated with differential input and an adjustment
for equalizing the gains of Amplifiers 1 and 2. Adjustment of
the circuit is quite simple. With both the X and Y voltages at
zero, connect Terminal 10 to Terminal 8. This procedure
disables Amplifier 2 and permits adjusting the offset voltage
of Amplifier 1 to zero by means of the 100k
Next, remove the short between Terminal 10 and 8 and
connect Terminal 15 to Terminal 8. This step disables
Amplifier 1 and permits Amplifier 2 to be zeroed with the
other potentiometer. With AC signals on both the X and Y
inputs, R
signals. Figure 29 shows the output waveform with the
multiplier adjusted. The voltage waveform in Figure 29A
shows suppressed carrier modulation of 1kHz carrier with a
triangular wave.
INPUT
INPUT
X
Y
FIGURE 27. FOUR QUADRANT MULTIPLIER
3
and R
FIGURE 29A.
R
11
IN
are adjusted for symmetrical output
I
I
FIGURE 29. VOLTAGE WAVEFORMS OF FOUR QUADRANT MULTIPLIER CIRCUIT
ABC (1)
ABC (2)
+
+
+
-
-
-
AMP
AMP
AMP
1
2
3
R
R
R
1
2
F
I
O(1)
I
O(2)
potentiometer.
R
L
FIGURE 29B.
V
CA3060
O
3-12
Figures 29B and 29C, respectively, show the squaring of a
triangular wave and a sine wave. Notice that in both cases
the output is always positive and returns to zero after each
cycle.
FIGURE 28. TYPICAL FOUR QUADRANT MULTIPLIER CIRCUIT
INPUT
INPUT
X
Y
270
1M
270
0.02 F
1M
51k
100
1.1M
24k
270
100
13
10
11
12
4
5
CA3060
AMP
AMP
AMP
1
3
2
FIGURE 29C.
16
15
14
4
7
6
3
9
8
200k
1M
240k
51
k
560k
560k
V+
1M
270
100k
100k
OUTPUT
V-