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AN6077 Datasheet(PDF) 7 Page - Intersil Corporation

Part # AN6077
Description  An IC Operational Transconductance Amplifier With Power Capability
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

AN6077 Datasheet(HTML) 7 Page - Intersil Corporation

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4-7
Performance
Figure 16 is a plot of the measured response of the complete
amplifier at the extremes of tone control rotation. A
comparison of Figure 16 with the computed curves of Figure
B4 (Appendix B) shows good agreement. The total harmonic
distortion of the amplifier with an unregulated power supply is
shown in Figure 17; IM distortion is plotted in Figure 18. Hum
and noise are typically 700
µV at the output, or 83dB down.
Companion RlAA Preamplifier
Many available preamplifiers are capable of providing the
drive for the power amplifier of Figure 14. Yet the unique
characteristics of the amplifier, its power supply, input
impedance, and gain make possible the design of an RIAA
preamplifier that can exploit these qualities. Since the input
impedance of the amplifier is essentially equal to the value of
the volume control resistance (250k
Ω), the preamplifier need
not have high output current capability. Because the gain of
the power amplifier is high (40dB) the preamplifier gain only
has to be approximately 30dB at the reference frequency
(1kHz) to provide optimum system gain.
Figure 19 shows the schematic diagram of a CA3080
preamplifier. The CA3080, a low cost OTA, provides sufficient
open-loop gain for all the bass boost necessary in RIAA
compensation. For example, a gm of 10mS with a load
resistance of 250k
Ω provides an open-loop gain of 68dB,
thus allowing at least 18dB of loop gain at the lowest
frequency. The CA3080 can be operated from the same
power supply as the main amplifier with only minimal
decoupling because of the high power supply rejection
inherent in the device circuitry. In addition, the high voltage
swing capability at the output enables the CA3080
preamplifier to handle badly over modulated (over-cut)
recordings without overloading. The accuracy of equalization
is within
±1dB of the RIAA curve, and distortion is virtually
immeasurable by classical methods. Overload occurs at an
output of 7.5V, which allows for undistorted inputs of up to
186mV (260mV peak).
60
55
50
45
40
35
30
25
20
15
10
10
23 6 8
100
23 6 8
1000
23 6 8
10K
100K
23 6 8
BASS CUT
TREBLE CUT
FLAT
TREBLE BOOST
BASS BOOST
FREQUENCY (Hz)
FIGURE 16. THE MEASURED RESPONSE OF THE AMPLIFIER
AT EXTREMES OF TONE CONTROL ROTATION
1.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
2
4
6
8
10
12
OUTPUT POWER (W)
2kHz
4kHz
16kHz
26kHz
1kHz
1kHz
0
FIGURE 17. TOTAL HARMONIC DISTORTION OF THE
AMPLIFIER WITH AN UNREGULATED POWER
SUPPLY
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
02
4
6
8
10
12
14
OUTPUT POWER (W)
FIGURE 18. IM DISTORTION OF THE AMPLIFIER WITH AN
UNREGULATED SUPPLY
60Hz
12kHz
60Hz
7kHz
60Hz
2kHz
Application Note 6077


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