Attenuators are used to damp a signal. Using pure ohmic resistors
the circuit can be realized for a very high bandwidth, i.e. from
DC to many GHz. The power attenuation
is defined as:
Fig. 14.1 shows an attenuator using the
-topology. The conductances can be calculated as follows.
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(14.2) |
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(14.3) |
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(14.4) |
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(14.5) |
Fig. 14.2 shows an attenuator using the T-topology. The resistances can be calculated as follows.
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(14.6) |
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(14.7) |
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(14.8) |
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(14.9) |
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(14.10) |