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AD2S93 bảng dữ liệu(PDF) 10 Page - Analog Devices |
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AD2S93 bảng dữ liệu(HTML) 10 Page - Analog Devices |
10 / 12 page –10– REV. A AD2S93 The AD2S93’s design has been optimized with a critically damped response. The closed-loop transfer function is given by: θ OUT θ IN = 1 + st 1 1 + st 1 + s2 K1K2 + s3t2 K1K2 θ OUT θ IN = K1K2 s 2 (1 + st 1 ) 1 + st 2 The normalized gain and phase diagrams are given in Figures 10 and 11 with a bandwidth of 1.25 kHz. 5 –45 10k –30 –40 10 –35 1 –15 –25 –20 –10 –5 0 1k 100 FREQUENCY – Hz Figure 10. AD2S93 Gain Plot –180 –140 –160 –120 –100 –60 –40 FREQUENCY – Hz 0 10k 10 1 –80 –20 1k 100 Figure 11. AD2S93 Phase Plot CIRCUIT DYNAMICS/ERROR SOURCES TRANSFER FUNCTION The AD2S93 operates as a Type 2 tracking servo loop. An inte- grator and VCO/counter perform the two integrations inherent in a Type 2 loop. The overall system response of the AD2S93 is that of a unity gain second order low-pass filter, with the position of the LVDT as the input and the digital position data as the output. Figure 9 illustrates the AD2S93 system diagram. G1 (s) G2 (s) VEL OUT OUT IN + Figure 9. AD2S93 Transfer Function Note: The AD2S93 has been configured with the following dy- namics. Reference Frequency 10 kHz 3 dB Bandwidth 1250 Hz VCO Gain is set in MODE 1 where VCOGAIN is connected to VEL. Using the procedure described in “SETTING THE CON- VERTER BANDWIDTH,” the following preferred values (E12 series) were calculated: C1 = 820 pF C2 = 6.8 nF R2 = 56 k Ω C3 = C4 = 470 pF, R7 = 15 k Ω, R5 = R6 = 33 kΩ, C4 = 470 pF The open-loop transfer function is given by: G1(s) = K 1 s 1 + st 1 1 + st 2 G2(s) = K 2 s where: t 2 = R2 C 1 × C2 C 1 + C2 t1 = R2 C2 and: K 1 = 4 ×10−3 25 ×103 = 160 × 10−9 × 1 C 1 + C2 = 21 K 2 = 4 R V × CV Note A2 has two values depending on which mode is being used K2 (MODE1) = 640 × 10 3 K2 (MODE2) = 160 × 10 3 The AD2S93 acceleration constant is given by: Ka = K1 × K2 Therefore in the example given, Ka = K1 × K2 = 21 × 640 × 10 3 = 13.44 × 106 s–2 |
Số phần tương tự - AD2S93 |
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Mô tả tương tự - AD2S93 |
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