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CA5130E bảng dữ liệu(PDF) 11 Page - Intersil Corporation

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11
Peak Detectors
Peak detector circuits are easily implemented with the
CA5130, as illustrated in Figure 7 for both the peak positive
and the peak negative circuit. It should be noted that with
large signal inputs, the bandwidth of the peak negative
circuit is much less than that of the peak positive circuit. The
second stage of the CA5130 limits the bandwidth in this
case. Negative going output signal excursion requires a
positive going signal excursion at the collector of transistor
Q11, which is loaded by the intrinsic capacitance of the
associated circuitry in this mode. On the other hand, during
a negative going signal excursion at the collector of Q11, the
transistor functions in active “pull down” mode so that the
intrinsic capacitance can be discharged more expeditiously.
Error Amplifier In Regulated Power Supplies
The CA5130 is an ideal choice for error amplifier service in
regulated power supplies since it can function as an error
amplifier when the regulated output voltage is required to
approach 0V. Figure 8 shows the schematic diagram of a
40mA power supply capable of providing regulated output
voltage by continuous adjustment over the range from 0V to
13V. Q3 and Q4 in IC2 (a CA3066 transistor array lC)
function as zeners to provide supply voltage for the CA5130
comparator (lC1). Q1,Q2, and Q5 in lC2 are configured as a
low impedance, temperature compensated source of
adjustable reference voltage for the error amplifier.
Transistors Q1, Q2, Q3, and Q4 in lC3 (another CA3086
transistor array lC) are connected in parallel as the series
pass element. Transistor Q5 in lC3 functions as a current
limiting device by diverting base drive from the series pass
transistors, in accordance with the adjustment of resistor R2.
Figure 9 contains the schematic diagram of a regulated
power supply capable of providing regulated output voltage
by continuous adjustment over the range from 0.1V to 50V
and currents up to 1A. The error amplifier (lC1) and circuitry
associated with lC2 function as previously described,
although the output of lC1 is boosted by a discrete transistor
(Q4) to provide adequate base drive for the Darlington
connected series pass transistors Q1, Q2. Transistor Q3
functions in the previously described current limiting circuit.
Multivibrators
The exceptionally high input resistance presented by the
CA5130 is an attractive feature for multivibrator circuit
design because it permits the use of timing circuits with high
R/C ratios. The circuit diagram of a pulse generator (astable
multivibrator), with provisions for independent control of the
“on” and “off” periods, is shown in Figure 10. Resistors R1
and R2 are used to bias the CA5130 to the midpoint of the
supply voltage and R3 is the feedback resistor. The pulse
repetition rate is selected by positioning S1 to the desired
position and the rate remains essentially constant when the
resistors which determine “on period” and “off period” are
adjusted.
Function Generator
Figure 11 contains a schematic diagram of a function
generator using the CA5130 in the integrator and threshold
detector functions. This circuit generates a triangular or
square wave output that can be swept over a 1,000,000:1
range (0.1Hz to 100kHz) by means of a single control, R1.A
voltage control input is also available for remote sweep
control.
The heart of the frequency determining system is an
operational transconductance amplifier (OTA) (see Note 9),
lC1, operated as a voltage controlled current source. The
output, IO, is a current applied directly to the integrating
capacitor, C1, in the feedback loop of the integrator lC2,
using a CA5130, to provide the triangular wave output.
Potentiometer R2 is used to adjust the circuit for slope
symmetry of positive going and negative going signal
excursions.
Another CA5130, lC3, is used as a controlled switch to set
the excursion limits of the triangular output from the
integrator circuit. Capacitor C2 is a “peaking adjustment” to
optimize the high frequency square wave performance of the
circuit.
Potentiometer R3 is adjustable to perfect the “amplitude
symmetry” of the square wave output signals. Output from
the threshold detector is fed back via resistor R4 to the input
of lC1 so as to toggle the current source from plus to minus
in generating the linear triangular wave.
Operation with Output Stage Power-Booster
The current sourcing and sinking capability of the CA5130
output stage is easily supplemented to provide power boost
capability. In the circuit of Figure 12, three CMOS transistor
pairs in a single CA3600E (see Note 10) lC array are shown
parallel connected with the output stage in the CA5130. In
the Class A mode of CA3600E shown, a typical device
consumes 20mA of supply current at 15V operation. This
arrangement boosts the current handling capability of the
CA5130 output stage by about 2.5X.
The amplifier circuit in Figure 12 employs feedback to
establish a closed-loop gain of 48dB. The typical large signal
bandwidth (-3dB) is 50kHz.
NOTES:
9. See File No. 475 and AN6668.
10. See File No. 619 for technical information.
CA5130, CA5130A


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