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Circuit realisation of negative-impedance convertor at v.h.f.

Circuit realisation of negative-impedance convertor at v.h.f.

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© The Institution of Electrical Engineers
Published

A circuit realisation of a v.h.f. negative-impedance convertor (n.i.c.) is presented. Using simultaneous multiple negative feedback, a stable operation is obtained to approximately 15% of fT. Using transistors with an fT of 1.1 GHz, the realised n.i.c. circuit operates to 160 MHz.

Inspec keywords: active networks; convertors; linear network synthesis; electrical impedance

Other keywords: negative impedance convertors; 160 MHz; active networks; convertors; VHF; linear network synthesis

Subjects: Filters and other networks

References

    1. 1)
      • E.L. Ginzton . Stabilized negative impedances—Pt. I. Electronics , 140 - 150
    2. 2)
      • Podel, A.F., Cristal, E.G.: `Negative-impedance converters (NIC) for VHF through microwave circuit applications', Proceedings of IEEE-GMTT international microwave symposium, 1971, p. 182–183.
    3. 3)
      • E.L. Ginzton . Stabilized negative impedances—Pt. II. Electronics , 138 - 148
http://iet.metastore.ingenta.com/content/journals/10.1049/el_19740118
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