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AN6077 Datasheet(PDF) 7 Page - Intersil Corporation |
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AN6077 Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 11 page 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 |
Similar Part No. - AN6077 |
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Similar Description - AN6077 |
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