전자부품 데이터시트 검색엔진 |
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ADA4922-1 데이터시트(PDF) 15 Page - Analog Devices |
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ADA4922-1 데이터시트(HTML) 15 Page - Analog Devices |
15 / 20 page ADA4922-1 Rev. 0 | Page 15 of 20 A more detailed view of the amplifier is shown in Figure 45. Each amplifier is a 2-stage design that uses an input H-Bridge followed by a rail-to-rail output stage (see Figure 46). The architecture used in the ADA4922-1 results in excellent SNR and distortion performance when compared to other differential amplifiers. RIN MIRROR C OUTPUT STAGE MIRROR INN OUT INP I I I I One of the more subtle points of operation arises when the two amplifiers are used to generate the differential outputs. Because the differential outputs are derived from a follower amplifier and an inverting amplifier, they have different noise gains and, therefore, different closed-loop bandwidths. For frequencies up to 1 MHz, the bandwidth difference between outputs causes little difference in the overall differential output performance. However, because the bandwidth is the sum of both amplifiers, the 3 dB point of the inverting amplifier defines the overall differential 3 dB corner (see Figure 48). 0 1 10k 100M FREQUENCY (Hz) –2 –4 –6 7 5 3 1M 100k 10M DIFFERENTIAL OUTPUT OUT+ OUT– Figure 45. Internal Amplifier Architecture ROUT MIRROR MIRROR INTERNAL REF OUT IN I I I I Figure 46. Output Stage Architecture Figure 48. Closed-Loop AC Gain (Differential Outputs) Figure 47 illustrates the open-loop gain and phase relationships of each amplifier in the ADA4922-1. Small delay and gain errors exist between the two outputs because the inverting output is derived from the noninverting output through an inverting amplifier. The gain error is due to imperfect matching of the inverting amplifier gain and feedback resistors, as well as differences in the transfer functions of the two amplifiers, as illustrated in Figure 48. The delay error is due to the delay through the inverting amplifier relative to the noninverting amplifier output. The delay produces a reduction in differential gain because the two outputs are not exactly 180° out of phase. Both of these errors combine to produce an overall gain error because the outputs are completely balanced. This error is very small at the frequencies involved in most ADA4922-1 applications. 125 –125 –100 –75 –50 –25 100 1k 10k 100M FREQUENCY (Hz) 75 100 50 25 0 1M 100k 10M GAIN PHASE Figure 47. Amplifier Gain/Phase Relationship |
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