ISSN:
1573-8906
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
Notes:
Conclusions A field-effect triode amplifier with series negative current feedback allows a voltage gain of the order of 200–300 to be obtained for a load resistance Rs≥1 MΩ. The coefficient Ku begins to decrease noticeably only for a feedback resistance above 500 Ω. The current gain reaches (8–10)·103. Increasing the resistances Rs and RL to hundreds of ohms has practically no effect on Ki. For a further increase of Rs and RL the coefficient Ki decreases. The power gain reaches its maximum value (of the order of 104 or more) for Rs≤100 Ω and RL=10–100 kΩ. An increase in Rs leads to a reduction of Kpmax and to a shift of the extremum of the function Kp=f(RL) into the range of higher values of RL. A large input resistance of the amplifier (tens of megohms and higher) is obtained when Rs increases to 10–100 MΩ. The maximum input resistance is obtained for RL→∞ and Rs→∞ and may exceed values of from hundreds of megohms to several gigaohms. The minimum input resistance is hundreds of kilohms for RL→∞ and Rs→0. The minimum input resistance (5–10 kΩ or less) is ensured for Rg→∞ and RL→0. An increase of the output resistance to hundreds of megohms or higher occurs for Rg→∞ and Rs→∞.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00983121
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