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AD603 Folha de dados(PDF) 7 Page - Analog Devices |
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AD603 Folha de dados(HTML) 7 Page - Analog Devices |
7 / 14 page AD603 REV. C –7– 31.07dB –42.14dB GPOS GNEG 31.07dB –42.14dB GPOS GNEG –40.00dB –51.07dB –8.93dB INPUT 0dB VC = 0V A1 A2 VG1 VG2 VO1 = 0.473V VO2 = 1.526V OUTPUT –20dB a. 31.07dB –42.14dB GPOS GNEG 31.07dB 0dB GPOS GNEG 0dB –11.07dB 31.07dB INPUT 0dB VC = 1.0V VG1 VG2 VO1 = 0.473V VO2 = 1.526V OUTPUT 20dB b. 31.07dB –2.14dB GPOS GNEG 31.07dB 0dB GPOS GNEG 0dB –28.93dB 31.07dB INPUT 0dB VC = 2.0V VG1 VG2 VO1 = 0.473V VO2 = 1.526V OUTPUT 60dB c. Figure 6. AD603 Gain Control Input Calculations for Sequential Control Operation +31.07dB +10dB A1 A2 +31.07dB +28.96dB –11.07dB –11.07dB 0.473 1.526 –8.93dB * * 0 0.5 1.0 1.50 2.0 VC (V) –20 0 20 40 60 62.14 –22.14 GAIN (dB) *GAIN OFFSET OF 1.07dB, OR 26.75mV Figure 7. Explanation of Offset Calibration for Sequential Control With reference to Figure 6, note that VG1 refers to the differen- tial gain-control input to A1 and VG2 refers to the differential gain-control input to A2. When VG is zero, VG1 = –473 mV and thus the gain of A1 is –8.93 dB (recall that the gain of each indi- vidual amplifier in the maximum-bandwidth mode is –10 dB for VG = –500 mV and 10 dB for VG = 0 V); meanwhile, VG2 = –1.908 V so the gain of A2 is “pinned” at –11.07 dB. The over- all gain is thus –20 dB. This situation is shown in Figure 6a. When VG = +1.00 V, VG1 = 1.00 V – 0.473 V = +0.526 V, which sets the gain of A1 to at nearly its maximum value of 31.07 dB, while VG2 = 1.00 V – 1.526 V = 0.526 V, which sets A2’s gain at nearly its minimum value –11.07 dB. Close analysis shows that the degree to which neither AD603 is completely pushed to its maximum or minimum gain exactly cancels in the overall gain, which is now +20 dB. This is depicted in Figure 6b. When VG = +2.0 V, the gain of A1 is pinned at 31.07 dB and that of A2 is near its maximum value of 28.93 dB, resulting in an overall gain of 60 dB (see Figure 6c). This mode of operation is further clarified by Figure 8, which is a plot of the separate gains of A1 and A2 and the overall gain versus the control voltage. Figure 9 is a plot of the gain error of the cascaded amplifiers versus the control voltage. Figure 10 is a plot of the gain error of the cascaded stages versus the control voltages. VC 70 –30 –0.2 2.2 0.2 0.6 0.1 1.4 1.8 60 30 0 –10 –20 50 40 20 10 COMBINED A1 A2 Figure 8. Plot of Separate and Overall Gains in Sequential Control |
Nº de peça semelhante - AD603 |
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Descrição semelhante - AD603 |
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