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LBPC Datasheet(PDF) 18 Page - Linear Technology |
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LBPC Datasheet(HTML) 18 Page - Linear Technology |
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18 / 24 page  LT1996 18 1996f Difference Amplifier: Additional Integer Gains Using Cross-Coupling Figure 12 shows the basic difference amplifier as well as the LT1996 in a difference gain of 27. But notice the effect of the additional dashed connections. This is referred to as “cross-coupling” and has the effect of reducing the differ- ential gain from 27 to 18. Using this method, additional integer gains are achievable, as shown in Table 5 below. Note that the equations can be written by inspection from the VIN+ connections, and that the VIN– connections are simply the opposite (swap P for M and M for P). The method is the same as for the LT1991, except that the LT1996 applies a multiplier of 9. Noise gain, bandwidth, and input impedance specifications for the various cases are also tabulated, as these are not obvious. Schematics are provided in Figure 13. Table 5. Connections Using Cross-Coupling. Note That Equations Can Be Written by Inspection of the VIN+ Column Gain Noise –3dB BW RIN+ RIN– Gain VIN + VIN – Equation Gain kHz Typ kΩ Typ kΩ 18 P27, M9 M27, P9 27 – 9 39 14 46 16 45 P81, M27, M9 M81, P27, P9 81 – 27 – 9 117 5 12 6 54 P81, M27 M81, P27 81 – 27 108 5 16 6 63 P81, P9, M27 M81, M9, P27 81 + 9 – 27 117 5 16 5 72 P81, M9 M81, P9 81 – 9 90 6 45 6 99 P81, P27, M9 M81, M27, P9 81 + 27 – 9 117 5 45 4 Figure 12. Another Method of Selecting Difference Gain Is “Cross-Coupling.” The Additional Method Means the LT1996 Provides Extra Integer Gains Figure 13. Integer Gain Difference Amplifiers Using Cross-Coupling APPLICATIO S I FOR ATIO 1996 F13 VS– VS+ VS– VS+ VS– VS+ VS– VS+ M81 M27 M9 P9 P27 P81 OUT VCC VOUT VEE REF LT1996 8 9 10 1 2 3 7 6 5 4 M81 M27 M9 P9 P27 P81 OUT VCC VOUT VEE REF LT1996 8 9 10 1 2 3 7 6 5 4 M81 M27 M9 P9 P27 P81 OUT VCC VOUT VEE REF LT1996 8 9 10 1 2 3 7 6 5 4 M81 M27 M9 P9 P27 P81 OUT VCC VOUT VEE REF LT1996 8 9 10 1 2 3 7 6 5 4 GAIN = 18 GAIN = 54 GAIN = 63 GAIN = 72 GAIN = 99 VIN + VIN – VS– VS+ M81 M27 M9 P9 P27 P81 OUT VCC VEE REF LT1996 8 9 10 1 2 3 7 6 5 4 GAIN = 45 VIN + VIN – VIN + VIN – VIN + VIN – VIN + VIN – VS– VS+ M81 M27 M9 P9 P27 P81 OUT VCC VOUT VEE REF LT1996 8 9 10 1 2 3 7 6 5 4 VIN + VIN – 4pF 4pF – + RF RG RG VIN + VIN + VIN – VIN – VOUT VOUT VOUT = GAIN • (VIN + – VIN–) GAIN = RF/RG – + 1996 F10 450k 450k 8 6 5 9 10 1 2 3 LT1996 CLASSICAL DIFFERENCE AMPLIFIER CLASSICAL DIFFERENCE AMPLIFIER IMPLEMENTED WITH LT1991. RF = 450k, RG = 16.7k, GAIN = 27. GAIN CAN BE ADJUSTED BY "CROSS COUPLING." MAKING THE DASHED CONNECTIONS REDUCE THE GAIN FROM 3 T0 2. WHEN CROSS COUPLING, SEE WHAT IS CONNECTED TO THE VIN + VOLTAGE. CONNECTING P27 AND M9 GIVES 27 – 9 = 18. CONNECTIONS TO VIN – ARE SYMMETRIC: M27 AND P9. RF CROSS- COUPLING 450k/81 450k/27 450k/9 450k/81 450k/27 450k/9 4pF 4pF |
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