| 21. | That extent is defined by the operating frequency : as frequencies increase, the input impedance of the MOSFETs decreases.
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| 22. | As you may have seen, amplifiers are often marked with a minimum input impedance the speakers need to have.
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| 23. | The feedback also increases the input impedance of the amplifier when seen from the base, which can be advantageous.
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| 24. | As a result, the effective voltage across and the current through the impedance increase; the input impedance decreases.
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| 25. | A voltage buffer has a very high input impedance ( the opposition to current flow viewed from the load ).
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| 26. | DVM measurement accuracy is affected by many factors, including temperature, input impedance, and DVM power supply voltage variations.
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| 27. | The input impedance for high-impedance amplifiers ( such as vacuum tubes, field effect transistor amplifiers and pF ).
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| 28. | Because the input impedance of the common-gate amplifier is very low, the cascode amplifier often is used instead.
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| 29. | For example, a Tektronix P6139A input impedance starts falling above 10 kHz and is about 100 ohms at 100 MHz.
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| 30. | The distinguishing feature of Zobel networks is that the input impedance is fixed in the design independently of the transfer function.
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