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CA3280A Arkusz danych(PDF) 6 Page - Intersil Corporation |
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CA3280A Arkusz danych(HTML) 6 Page - Intersil Corporation |
6 / 10 page 6 of the CA3280. The linearization diode impedance also decreases as the diode bias current increases, which further loads the input. The diodes, in addition to acting as a linearization network, also operate as an additional attenuation system to accommodate input signals in the volt range when they are applied through appropriate input resistors. Figure 10 shows a triangle wave to sine wave converter using the CA3280. Two 100k Ω resistors are connected between the differential amplifier emitters and V+ to reduce the current flow through the differential amplifier. This allows the amplifier to fully cut off during peak input signal excursions. THD is appropriately 0.37% for this circuit. FIGURE 4. VOA SHOWING LINEARIZATION DIODES AND CURRENT DRIVE FIGURE 5. BLOCK DIAGRAM OF LINEARIZED VOA FIGURE 6. DIFFERENTIAL TO SINGLE ENDED CONVERTER FIGURE 7. TYPICAL GAIN CONTROL CIRCUIT V+ VOA V- RD = SMALL SIGNAL DIODE IMPEDANCE RD ≈ 52 Ω ID(mA) x 1.34 = 70 ID IABC ID RD VOA ID IABC 4 1/2 + - 13 15 16 3 2k Ω 1 CA3280 14 +15V 68k Ω SINGLE- ENDED OUTPUT DIFFERENTIAL 2k Ω INPUT 10k Ω -15V 4 1/2 + - 13 15 16 14 10k Ω 3 CA3280 1 V+ = +15V 68k Ω OUTPUT 21VP-P 14mV AGC 330k Ω 15k Ω V- = -15V FEEDTHRU 400 µV NOISE AT MAX GAIN 20k Ω 10k Ω 600 Ω 10VP-P INPUT V+ V- 100k Ω VOLTAGE CONTROL CA3280, CA3280A |
Podobny numer części - CA3280A |
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Podobny opis - CA3280A |
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