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THS4022DGN Datasheet(PDF) 9 Page - Texas Instruments |
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THS4022DGN Datasheet(HTML) 9 Page - Texas Instruments |
9 / 22 page THS4021, THS4022 350-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS SLOS265B – SEPTEMBER 1999 – REVISED FEBRUARY 2000 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION theory of operation The THS402x 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 30. IN – (2) IN + (3) NULL (1) NULL (8) (6) OUT (4) VCC – (7) VCC + Figure 30. THS4021 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 THS402x is shown in Figure 31. 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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