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STPM33 Folha de dados(PDF) 51 Page - STMicroelectronics

Nome de Peças STPM33
Descrição Electrónicos  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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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPM33 Folha de dados(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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