1. Gives the small source impedance ( output impedance ) of the power amplifier. 2. For a medium source impedance , a common emitter or common source topology may be used. 3. Consider a real source impedance of R _ 1 and real load impedance of R _ 2. 4. If the source impedance is low, then a common base or common gate circuit topology may be appropriate. 5. If a reactance X _ 1 is in parallel with the source impedance , the combined impedance can be written as: 6. The theorem can be extended to alternating current circuits that include impedance is equal to the complex conjugate of the source impedance . 7. Using a dedicated hysteresis pin is also convenient if the source impedance is high since the inputs are isolated from the hysteresis network. 8. Alternatively, a voltage buffer may be used before the amplifier input, reducing the effective source impedance seen by the input terminals. 9. In general, the source impedance is matched to the input impedance because that will maximize the power transfer from the source to the device. 10. :: : If you are going to simulate this circuit on spice, I would use a representative source impedance to simulate the aerial.
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