In most circuits, this problem is easily overcome by selecting a load impedance at least two orders of magnitude greater than the bias resistance.
22.
Alternatively, the above formula can be rearranged to express the input impedance in terms of the load impedance rather than the load voltage reflection coefficient:
23.
Errors in phase are also important especially in power measuring circuits, and each class has an allowable maximum phase error for a specified load impedance.
24.
Although, for a given appropriate source and load impedance, RF amplifiers can be characterized as amplifying voltage or current, they fundamentally are amplifying power.
25.
A constant output voltage is required in many power supply applications, but the voltage provided by many energy sources will vary with changes in load impedance.
26.
However, an amplifier with a low internal impedance delivers more electrical output power when the load impedance reduces ( until the impedances become approximately matched ).
27.
They use a narrow tuned circuit to provide the valve with a suitably high load impedance and feed a load that is typically 50 or 75 Ohms.
28.
This can be ensured by making the load impedance equal to Z 0, in which case the transmission line is said to be " matched ".
29.
The leakage reactance ( usually about 5 to 10 % of the full load impedance ) helps limit both the magnitude and rate of rise of the fault current.
30.
Then very little current flows, and the voltage-divider effect with the load impedance imposes on the collector point a high voltage very near to V cc.
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