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THS4082CDG4 Datasheet(PDF) 11 Page - Texas Instruments |
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THS4082CDG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 32 page THS4081, THS4082 175MHz LOW POWER HIGHSPEED AMPLIFIERS SLOS274D − DECEMBER 1999 − REVISED JUNE 2001 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION theory of operation The THS408x is a high-speed, operational amplifier configured in a voltage feedback architecture. It is built using a 30-V, dielectrically isolated, complementary bipolar process with NPN and PNP transistors possessing fTs of several GHz. This results in an exceptionally high performance amplifier that has a wide bandwidth, high slew rate, fast settling time, and low distortion. A simplified schematic is shown in Figure 38. IN − (2) IN + (3) (6) OUT (4) VCC − (7) VCC + Figure 38. THS4081 Simplified Schematic noise calculations and noise figure Noise can cause errors on very small signals. This is especially true when amplifying small signals, where signal-to-noise ratio (SNR) is very important. The noise model for the THS408x is shown in Figure 39. This model includes all of the noise sources as follows: • e n = Amplifier internal voltage noise (nV/√Hz) • IN+ = Noninverting current noise (pA/√Hz) • IN− = Inverting current noise (pA/√Hz) • e Rx = Thermal voltage noise associated with each resistor (eRx = 4 kTRx ) |
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