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EL2020CM Datasheet(PDF) 10 Page - Elantec Semiconductor |
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EL2020CM Datasheet(HTML) 10 Page - Elantec Semiconductor |
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10 / 20 page  EL2020C 50 MHz Current Feedback Amplifier Application Information Theory of Operation The EL2020 has a unity gain buffer similar to the EL2003 from the non-inverting input to the in- verting input The error signal of the EL2020 is a current flowing into (or out of) the inverting in- put A very small change in current flowing through the inverting input will cause a large change in the output voltage This current ampli- fication is the transresistance (ROL)ofthe EL2020 VOUT e ROL IINV Since ROL is very large ( 106) the current flowing into the inverting input in the steady state (non-slewing) condition is very small Therefore we can still use op-amp assumptions as a first order approximation for circuit analysis namely that 1 The voltage across the inputs 0 and 2 The current into the inputs is 0 Simplified Block Diagram of EL2020 2020 – 10 Resistor Value Selection and Optimization The value of the feedback resistor (and an inter- nal capacitor) sets the AC dynamics of the EL2020 A nominal value for the feedback resis- tor is 1 k X which is the value used for produc- tion testing This value guarantees stability For a given gain the bandwidth may be increased by decreasing the feedback resistor and conversely the bandwidth will be decreased by increasing the feedback resistor Reducing the feedback resistor too much will re- sult in overshoot and ringing and eventually os- cillations Increasing the feedback resistor results in a lower b3 dB frequency Attenuation at high frequency is limited by a zero in the closed loop transfer function which results from stray capaci- tance between the inverting input and ground Power Supplies The EL2020 may be operated with single or split power supplies as low as g3V (6V total) to as high as g18V (36V total) The slew rate degrades significantly for supply voltages less than g5V (10V total) but the bandwidth only changes 25% for supplies from g3V to g18V It is not neces- sary to use equal value split power supplies ie b 5V and a12V would be excellent for 0V to 1V video signals Bypass capacitors from each sup- ply pin to a ground plane are recommended The EL2020 will not oscillate even with minimal by- passing however the supply will ring excessively with inadequate capacitance To eliminate supply ringing and the errors it might cause a 47 mF tantalum capacitor with short leads is recom- mended for both supplies Inadequate supply by- passing can also result in lower slew rate and longer settling times Non-Inverting Amplifier 2020 – 11 EL2020 Typical Non-Inverting Amplifier Characteristics 10V AV RF RG Bandwidth Settling Time 1% 01% a 1 820 X None 50 MHz 50 ns 90 ns a 2 750 X 750 X 50 MHz 50 ns 100 ns a 5 680 X 170 X 50 MHz 50 ns 200 ns a 10 680 X 76 X 30 MHz 55 ns 280 ns 10 |
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