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EL2140C Fiches technique(PDF) 6 Page - Elantec Semiconductor |
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EL2140C Fiches technique(HTML) 6 Page - Elantec Semiconductor |
6 / 12 page EL2140C2141C 150 MHz Differential Twisted Pair Driver Applications Information EL2141C 2140-13 GAIN e R1 a R2 a R3 R2 EL2140C 2140-14 GAIN e 2 VOUT a VOUTB 2 e VREF (common mode) Choice of feedback resistor There is little to be gained from choosing resistor R2 values below 400 X and in fact it would only result in increased power dissipation and signal distortion Above 400 X the bandwidth response will develop some peaking (for a gain of two) but substantially higher resistor R2 values may be used for higher voltage gains such as up to 2 k X at a gain of eight before peaking will develop R1 and R3 are selected as needed to set the voltage gain and while R1 e R3 is suggested the gain equation above holds for any values (see distor- tion for further suggestions) Capacitance considerations As with many high bandwidth amplifiers the EL2140C2141C prefer not to drive highly capac- itive loads It is best if the capacitance on VOUT and VOUTB is kept below 10 pF if the user does not want gain peaking to develop In addition on the EL2141C the two feedback nodes FBP and FBN should be laid out so as to minimize stray capacitance else an additional pole will potentially develop in the response with possible gain peaking The amount of capacitance tolerated on any of these nodes in an actual application will also be dependent on the gain setting and the resistor values in the feedback network Distortion considerations The harmonics that these amplifiers will poten- tially produce are the 2nd 3rd 5th and 6th Their amplitude is application dependent All other harmonics should be negligible by compari- son Each should be considered separately H2 The second harmonic arises from the input stage and the lower the applied differential sig- nal amplitude the lower the magnitude of the second harmonic For practical considerations of required output signal and input noise levels the user will end up choosing a circuit gain Refer- ring to Figure 1 it is best if the voltage at the negative feedback node tracks the VREF node and the voltage at the positive feedback node tracks the VIN node respectively This would the- oretically require that R1 a R2 e R3 although the lowest distortion is found at about R3 e R1 a (07 R2) With this arrangement the second harmonic should be suppressed well below the value of the third harmonic 6 |
Numéro de pièce similaire - EL2140C |
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Description similaire - EL2140C |
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