參數(shù)資料
型號(hào): THS4140CDGK
廠商: Texas Instruments, Inc.
英文描述: HIGH SPEED FULLY DIFFERENTIAL I/O AMPLIFIERS
中文描述: 高速全差分的I / O功放
文件頁(yè)數(shù): 17/24頁(yè)
文件大小: 523K
代理商: THS4140CDGK
SLOS320E MAY 2000 REVISED JANUARY 2004
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
theory of operation (continued)
VOCM
_
+
_
+
VCC+
VIN
VIN+
VO+
VO
VOD= 10 = 1
VOD = 01 = 1
a
b
+1
0
+1
0
VCC
Figure 31. Fully Differential Amplifier With Two 1-V
PP
Signals
Similar to the standard inverting amplifier configuration, input impedance of a fully differential amplifier is
selected by the input resistor, R
(g)
. If input impedance is a constraint in design, the designer may choose to
implement the differential amplifier as an instrumentation amplifier. This configuration improves the input
impedance of the fully differential amplifier. The following schematic depicts the general format of
instrumentation amplifiers.
The general transfer function for this circuit is:
VOD
VIN1– VIN2
Rf
R(g)
1
2R2
R1
_
+
_
+
_
+
THS4012
THS4012
VIN1
VIN2
R2
R1
R2
R(g)
R(g)
Rf
Rf
THS414x
Figure 32. Instrumentation Amplifier
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