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Constant-current source with unusually high internal resistance and good temperature stability

Constant-current source with unusually high internal resistance and good temperature stability

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A transistor operating at 1 mA, with 10 kΩ in the emitter lead, gives a collector a.c. output resistance in the region of 10 MΩ. A 2-transistor circuit is described, having an output resistance of approximately 50 MΩ, with much improved temperature stability. A further modification gives an output resistance of about 1000 MΩ, corresponding to an ‘aiming voltage’ of 1 MV.

References

    1. 1)
      • G.P. Hobbs . Introduction to practical transistor circuit design. Wireless World
    2. 2)
      • Hilbiber, D.F.: `A new semiconductor voltage standard', Digest of Technical Papers, Solid State Circuits Conference, 1964, p. 32.
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