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STPM32 Scheda tecnica(PDF) 51 Page - STMicroelectronics

Il numero della parte STPM32
Spiegazioni elettronici  ASSP for metering applications with up to four independent 24-bit 2nd order sigma-delta ADCs, 4 MHz OSF and 2 embedded PGLNA
PDF  121 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPM32 Scheda tecnica(HTML) 51 Page - STMicroelectronics

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DS10272 Rev 8
51/121
STPM32, STPM33, STPM34
Theory of operation
121
RMS block architecture is shown in Figure 38:
Figure 38. RMS block
If the cut-off frequency of an LP filter is set much below the input signal spectrum, it can be
considered as an average operator. In this case and according to the figure, the first LP filter
averages its input signal which is produced by division and multiplication:
Equation 7
By assumption, the feedback signal R is DC type and therefore, it can be extracted from the
average operation and the above equation can be rearranged into:
Equation 8
By a square-root operation on both sides of previous equation we get:
Equation 9
which is RMS value exact definition.
/
LPF
1/2
LPF
-
GIPG2803141121LM
R
X
2
R
------


=
R
2
X
2

=
RX
2

=



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