High gain distributed amplifiers

Amplifiers – With distributed parameter-type coupling means – Distributed amplifier

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330277, H03F 360

Patent

active

048765163

ABSTRACT:
A distributed amplifier which increases gain by increasing transconductance comprises a plurality of amplifying elements. Each element includes a darlington amplifier connected in cascade with a FET (field effect transistor) amplifier. The darlington amplifier includes an RC (resistance/capacitance) feedback loop from the drain to the gate. Each of the amplifying elements are coupled in parallel between an input transmission line and an output transmission line. The output transmission line operates as a recombining network as the input signals pass through the amplifying elements. To further increase gain and power output, a time delay line is coupled to each end of the output transmission line. The time delay line simulates the terminating elements normally associated with distributed amplifiers, and collects unguided signals from the output transmission line to recombine them with guided signals at the output. These unguided signals are terminated in conventional distributed amplifiers resulting in approximately a 3 dB (decibal) loss in gain. Recombining the unguided signals with guided signals at the output preserves the 3 dB gain the output transmission line for an overall output increase in gain. The time delay line provides the means for increasing second and third order intercept points of the amplifier by recombining the unguided signals with the guided signals.

REFERENCES:
patent: 3986133 (1976-10-01), Roza et al.
patent: 4359695 (1982-01-01), Gerard
patent: 4486719 (1984-12-01), Ayasli
patent: 4595881 (1986-06-01), Kennan
patent: 4771196 (1988-09-01), Mead et al.

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