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AD8014AR 데이터시트(PDF) 8 Page - Analog Devices |
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AD8014AR 데이터시트(HTML) 8 Page - Analog Devices |
8 / 10 page AD8014 –8– REV. B Note: On Figures 19 and 20 RF = 500 Ω, R S = 50 Ω and C L = 20 pF. APPLICATIONS CD ROM and DVD Photodiode Preamp High speed Multi-X CD ROM and DVD drives require high frequency photodiode preamps for their read channels. To mini- mize the effects of the photodiode capacitance, the low imped- ance of the inverting input of a current feedback amplifier is advantageous. Good group delay characteristics will preserve the pulse response of these pulses. The AD8014, having many ad- vantages, can make an excellent low cost, low noise, low power, and high bandwidth photodiode preamp for these applications. Figure 21 shows the circuit that was used to imitate a photo- diode preamp. A photodiode for this application is basically a high impedance current source that is shunted by a small ca- pacitance. In this case, a high voltage pulse from a Picosecond Pulse Labs Generator that is ac-coupled through a 20 k Ω resis- tor is used to simulate the high impedance current source of a photodiode. This circuit will convert the input voltage pulse into a small charge package that is converted back to a voltage by the AD8014 and the feedback resistor. In this case the feedback resistor chosen was 1.74 k Ω, which is a compromise between maintaining bandwidth and providing sufficient gain in the preamp stage. The circuit preserves the pulse shape very well with very fast rise time and a minimum of overshoot as shown in Figure 22. AD8014 1.74k 20k 49.9 49.9 +5V –5V OUTPUT (10 PROBE) (NO LOAD) 0.1 F INPUT Figure 21. AD8014 as a Photodiode Preamp INPUT 20mV/DIV 1 2 OUTPUT 500mV/DIV CH1 20.0V CH2 500mV M 25.0ns CH4 380mV TEK RUN: 2.0GS/s ET AVERAGE T[ ] Figure 22. Pulse Response Figure 19. Large Signal Step Response; VS = ±5 V, VO = 4 V Step Figure 20. Large Signal Step Response; VS = +5 V, VO = 2 V Step |
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