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THS4021IDG4 Datasheet(PDF) 9 Page - Texas Instruments |
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THS4021IDG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 29 page www.ti.com APPLICATION INFORMATION Theory of Operation IN– (2) IN+(3) NULL (1) NULL (8) (6)OUT (4)V CC– (7)V CC+ S0276-01 Noise Calculations and Noise Figure THS4021 THS4022 SLOS265C – SEPTEMBER 1999 – REVISED JULY 2007 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 fT 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. Figure 30. THS4021 Simplified Schematic 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) Copyright © 1999–2007, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): THS4021 THS4022 |
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