AN3394 datasheet(26/29 Pages) STMICROELECTRONICS

26 / 29 page

Demonstration of C11 and C22 calculation

AN3394

26/29

Doc ID 018754 Rev 5

A.3

Serial to parallel equivalence RC impedance, and example of

RC load

Figure 24.

Serial-to-parallel RC equivalent circuit

So:

Equation (A.III.1)

Consider that:

Equation (A.III.2)

Equation (A.III.2) in equation (A.III.1) leads to:

Identify the real and the imaginary parts:

RXP

input

----------------------------------

RXP

ω R

RXP

input

–

------------------------------------------------------------------------

ω C

input

--------------------------

–

RXP

input

–

×)

(

-------------------------------------------------------------------------

RXP

input

–

×ω

RXP

input

–

×)

(

-------------------------------------------------------------------------

–

IM Z

()

RE Z

()

-------------------------

ω C

input

-----------------------------------------------------

ω C

input

–

RXP

ω C

input

--------------------------

–

RXP

------------------------

input

–

---------------------------------

–

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