Space feedback apparatus for field effect transistors

Details Space feedback apparatus for field effect transistors Space feedback apparatus for field effect transistors

1985-10-07

1986-11-25

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including distributed parameter-type coupling

330277, 330291, 330294, H03F 138, H03F 360

Patent

active

046251790

ABSTRACT:
Space feedback comprising a shield over the tuning elements of a FET radio frequency amplifier provides positive feedback between the gate and drain terminals to raise the gain of the amplifier above what it would be without the space feedback, while simultaneously lowering the noise figure. Not only is the relative noise lowered, but the absolute amount of noise is lowered.

REFERENCES:
patent: 3999142 (1976-12-01), Presser et al.
Ulrich, "Use Negative Feedback to Slash Wideband VSWR," Microwaves, Oct. 1978, pp. 66-68, 70.
Tohyama et al, "23-GHz Band GaAs MESFET Reflection-Type Amplifier," IEEE Transactions on Microwave Theory and Techniques, vol. MTT-27, No. 5, May 1979, pp. 408-411.

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