ca3160t Intersil Corporation, ca3160t Datasheet - Page 12

• Manufacturer Part Number: ca3160t
• Description: 4mhz, Bimos Operational Amplifier With Mosfet Input/cmos Output
• Manufacturer: Intersil Corporation

Staircase Generator
Figure 10 shows a staircase generator circuit utilizing three
CMOS operational amplifiers. Two CA3130s are used; one
as a multivibrator, the other as a hysteresis switch. The third
amplifier, a CA3160, is used as a linear staircase generator.
Picoammeter Circuit
Figure 11 is a current-to-voltage converter configuration
utilizing a CA3160 and CA3140 to provide a picoampere
NOTE: A square wave signal modulates the external sweeping input
to produce 1Hz and 1MHz, showing the 1,000,000/1 frequency range
of the Function Generator.
100
100
FIGURE 9B. TWO-TONE OUTPUT SIGNAL FROM THE
k
k
+15V
15 - 115pF
ADJUST
100
k
FREQ
FUNCTION GENERATOR
MULTIVIBRATOR
1M
3
2
FIGURE 9. 1,000,000/1 SINGLE CONTROL FUNCTION GENERATOR: 1Hz to 1MHz
CA3130
+
-
4
12
7
+15V
8
6
MULTIVIBRATOR RETRACE INHIBIT
FIGURE 10A. STAIRCASE GENERATOR CIRCUIT
8.2k
STEP HEIGHT
ADJUST
4 - 60pF
CA3160, CA3160A
COMMUTATING
NETWORK
CHARGE
1N914
NOTE: The bottom trace is the sweeping signal and the top trace is
the actual generator output. The center trace displays the 1MHz signal
via delayed oscilloscope triggering of the upper swept output signal.
FIGURE 9C. TRIPLE-TRACE OF THE FUNCTION GENERATOR
meter for 13pA full scale meter deflection. By placing
Terminals 2 and 4 of the CA3160 at ground potential, the
CA3160 input is operated in the “guarded mode”. Under this
operating condition, even slight leakage resistance present
between Terminals 3 and 2 or between Terminals 3 and 4
would result in zero voltage across this leakage resistance,
thus substantially reducing the leakage current.
If the CA3160 is operated with the same voltage on input
Terminals 3 and 2 as on Terminal 4, a further reduction in the
2
3
INTEGRATOR
470pF
CA3160
+
-
7
4
SWEEPING TO 1MHz
+15V
5.1k
2k
6
+15V
10k
1.5
M
STAIRCASE
OUTPUT
HYSTERESIS SWITCH
+15mV TO +10V
3
2
1N914
CA3130
+
-
+15V
7
4
8
100k
51k
6