TS419-TS421
Fig. 98 : Differential Input Amplifier
Configuration
Input capacitance C can be calculated by the
following formula using the -3dB lower frequency
required. (FL is the lower frequency required)
C ≈ 1 (F)
2 π R1 FL
Note : This formula is true only if:
FCB
=
1
942000 × C B
(Hz )
is ten times lower than FL.
The following bill of material is an example of a
differential amplifier with a gain of 2 and a -3dB
lower cuttoff frequency of about 80Hz.
Components :
Designator
Part Type
R1
20k / 1%
R2
20k / 1%
C
100nF
CB=CS
U1
1µF
TS419/21
29/32