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Diffstat (limited to 'chapter05')
| -rw-r--r-- | chapter05/content_ch05.tex | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/chapter05/content_ch05.tex b/chapter05/content_ch05.tex index f598e65..033246e 100644 --- a/chapter05/content_ch05.tex +++ b/chapter05/content_ch05.tex @@ -87,7 +87,7 @@ The \index{amplitude modulation} \textbf{\acf{AM}} is the alteration of the carr The carrier is a mono-chromatic signal: \begin{equation} - x_C(t) = \hat{X}_C \cdot \cos\left(2\pi f_C + \varphi_C\right) + x_C(t) = \hat{X}_C \cdot \cos\left(2\pi f_C t + \varphi_C\right) \end{equation} where \begin{itemize} @@ -1063,10 +1063,14 @@ So, the input signal's spectrum consists of a positive and a negative part: The frequencies $\omega_{o,1}$ and $\omega_{o,2}$ are called \index{mirror frequencies} \textbf{mirror frequencies}. \end{definition} +x + \begin{attention} Because of the mirror frequency issue, a filter (\ac{LPF}, \ac{BPF}, etc.) must follow or precede a mixer to eliminate the unwanted mirror frequency. \end{attention} +x + \begin{figure}[H] \subfloat[Input and \acs{LO} signals in the frequency-domain] { |