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EL2160C Datasheet(PDF) 11 Page - Elantec Semiconductor |
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EL2160C Datasheet(HTML) 11 Page - Elantec Semiconductor |
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11 / 18 page  11 EL2160C 180MHz Current Feedback Amplifier Applications Information Product Description The EL2160C is a current mode feedback amplifier that offers wide bandwidth and good video specifications at a moderately low supply current. It is built using Elantec's proprietary complimentary bipolar process and is offered in industry standard pin-outs. Due to the current feedback architecture, the EL2160C closed-loop 3dB bandwidth is dependent on the value of the feedback resistor. First the desired bandwidth is selected by choosing the feedback resistor, RF, and then the gain is set by picking the gain resistor, RG. The curves at the beginning of the Typical Performance Curves section show the effect of varying both RF and RG. The 3dB bandwidth is somewhat dependent on the power supply voltage. As the supply voltage is decreased, internal junction capacitances increase, causing a reduction in closed loop bandwidth. To compensate for this, smaller values of feedback resistor can be used at lower supply voltages. Power Supply Bypassing and Printed Circuit Board Layout As with any high frequency device, good printed circuit board layout is necessary for optimum performance. Ground plane construction is highly recommended. Lead lengths should be as short as possible, below ¼. The power supply pins must be well bypassed to reduce the risk of oscillation. A 1.0µF tantalum capacitor in parallel with a 0.01µF ceramic capacitor is adequate for each supply pin. For good AC performance, parasitic capacitances should be kept to a minimum, especially at the inverting input (see Capacitance at the Inverting Input section). This implies keeping the ground plane away from this pin. Carbon resistors are acceptable, while use of wire- wound resistors should not be used because of their par- asitic inductance. Similarly, capacitors should be low inductance for best performance. Use of sockets, partic- ularly for the SO package, should be avoided. Sockets add parasitic inductance and capacitance which will result in peaking and overshoot. Capacitance at the Inverting Input Due to the topology of the current feedback amplifier, stray capacitance at the inverting input will affect the AC and transient performance of the EL2160C when operating in the non-inverting configuration. The char- acteristic curve of gain vs. frequency with variations of CIN- emphasizes this effect. The curve illustrates how the bandwidth can be extended to beyond 200MHz with some additional peaking with an additional 2pF of capacitance at the VIN- pin for the case of AV = +2. Higher values of capacitance will be required to obtain similar effects at higher gains. In the inverting gain mode, added capacitance at the inverting input has little effect since this point is at a vir- tual ground and stray capacitance is therefore not “seen” by the amplifier. Feedback Resistor Values The EL2160C has been designed and specified with RF=560Ω for AV = +2. This value of feedback resistor yields extremely flat frequency response with little to no peaking out to 130MHz. As is the case with all current feedback amplifiers, wider bandwidth, at the expense of slight peaking, can be obtained by reducing the value of the feedback resistor. Inversely, larger values of feed- back resistor will cause rolloff to occur at a lower frequency. By reducing RF to 430Ω, bandwidth can be extended to 170MHz with under 1dB of peaking. Fur- ther reduction of RF to 360Ω increases the bandwidth to 195MHz with about 2.5dB of peaking. See the curves in the Typical Performance Curves section which show 3dB bandwidth and peaking vs. frequency for various feedback resistors and various supply voltages. Bandwidth vs Temperature Whereas many amplifier's supply current and conse- quently 3dB bandwidth drop off at high temperature, the EL2160C was designed to have little supply current variations with temperature. An immediate benefit from this is that the 3dB bandwidth does not drop off drasti- cally with temperature. With VS = ±15V and AV = +2, the bandwidth only varies from 150MHz to 110MHz |
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