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Bias SelectionAuthor: Leonard Krugman
E_{e} = R_{E}I_{e}. The two conditional equations can be combined to evaluate R_{E} in terms of known quantities:
Since R_{E} also equals , equation 62 limits the value of the emitter bias battery to less than that of E_{c}. The limiting value of E_{e} = E_{c} is reached when R_{c} = 0. As a numerical example, if the values associated with Fig. 610 (B) are used so that the bias current at the center of the negative resistance region is I_{e} = 0.75 ma, then and E_{e} = I_{e}R_{E} = .75 × 10^{3} × 31.5 × 10^{3} = 23.6 volts. The negative resistance of the oscillator is equal to the slope of the characteristics in that region. Then This value defines the maximum limit of the impedance of the LC series emitter circuit at resonance.


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