參數(shù)資料
型號: THS7002CPWP
廠商: TEXAS INSTRUMENTS INC
元件分類: 模擬信號調(diào)理
英文描述: SPECIALTY ANALOG CIRCUIT, PDSO28
封裝: GREEN, PLASTIC, HTSSOP-28
文件頁數(shù): 7/41頁
文件大?。?/td> 1203K
代理商: THS7002CPWP
THS7001, THS7002
70MHz PROGRAMMABLEGAIN AMPLIFIERS
SLOS214C OCTOBER 1998 REVISED MARCH 2007
15
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
theory of operation
Each section of the THS7001 and THS7002 consists of a pair of high speed operational amplifiers configured
in a voltage feedback architecture. They are built using a 30-V, dielectrically isolated, complementary bipolar
process with NPN and PNP transistors possessing fTs of several GHz. This results in exceptionally high
performance amplifiers that have a wide bandwidth, high slew rate, fast settling time, and low distortion. A
simplified schematic of the preamplifiers are shown in Figure 51.
IN
IN +
OUT
VCC
VCC +
Figure 51. Pre-Amp Simplified Schematic
noise calculations and noise figure
Noise can cause errors on very small signals. This is especially true for the preamplifiers, which typically amplify
small signals. The noise model is shown in Figure 52. 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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