Active load applications for distributed circuits

Details Active load applications for distributed circuits Active load applications for distributed circuits

1993-03-11

1994-11-01

Mullins, James B.

Amplifiers

With distributed parameter-type coupling means

Distributed amplifier

330147, 330148, 330277, 330286, 330295, H03F 360, H03F 368

Patent

active

053610385

ABSTRACT:
An active load applied to the gate transmission line termination of distributed power devices reduces the low frequency noise power appearing at the output of the device. The active load, including at least one active device such as a field effect transistor, operates by transforming the input impedance of a low noise amplifier to the desired load impedance. The active load is connected to one end of an input transmission line having a plurality of impedances connected in electrical series. An input terminal is connected to the opposite end. An output transmission line, also having a plurality of impedances connected in series, has an output terminal at one end and a terminating output impedance at the other. A plurality of active devices are connected to junction points between the series connected impedances of the input and output lines.

REFERENCES:
patent: 4668920 (1987-05-01), Jones
patent: 4769618 (1988-09-01), Parish et al.
patent: 5012203 (1991-04-01), Beyer et al.
"An Active `Cold` Noise Source", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-29, No. 4, Apr. 1981, pp. 344-347 R. Frater and D. Williams.
C. Aitchison, "The Intrinsic Noise Figure of the MESFET Distribute Amplifier", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-33, No. 6, Jun. 1985, pp. 460-466.

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