Negative feedback amplifiers including directional couplers

Details Negative feedback amplifiers including directional couplers Negative feedback amplifiers including directional couplers

H - Electricity

03

F

330/35

H03F 1/34 (2006.01)

Patent

CA 1187949

NEGATIVE FEEDBACK AMPLIFIERS INCLUDING DIRECTIONAL COUPLERS Abstract of the Disclosure An intermediate frequency preamplifier of a microwave radio receiver includes an amplifier circuit having a negative feedback path including a directional coupler constituted by two transformers. One port of the directional coupler is terminated with a complex impedance, producing a controlled mis-match, which is adjustable to optimize the input return loss of the amplifier without changing the noise figure of the preamplifier. The amplifier circuit has a low impedance output constituted by a common-collector transistor so that the signal reflected back into the directional coupler by the mis-match does not significantly affect the output of the amplifier. - i -

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