Circuit layout and method for frequency-dependent matching of a high-frequency amplifier stage

摘要

A circuit for frequency-dependent matching of a high-frequency amplifier stage includes high-frequency stage with an output to a total high-frequency path that divides a total frequency band into a plurality of partial frequency paths for respectively preset partial frequency bands. The outputs of the plurality of partial frequency paths are reunited again into the total high-frequency path, following the processing of the partial frequency bands of these partial frequency paths. The partial frequency paths include a matching network surrounded by a first and second pass filter. At least one partial frequency path is switchable, when a control signal is supplied thereto.

主权项

1. A circuit, comprising:
a high-frequency amplifier stage, which includes a high-frequency amplifier with an input and an output, wherein the output of the high-frequency amplifier is coupled to a total high-frequency path carrying a total frequency band; a first partial frequency path coupled to the total high-frequency path, wherein the first partial frequency path includes
a first pass filter configured to pass a first partial frequency band,a first matching network coupled to the first pass filter, wherein the first matching network is configured to match the high-frequency amplifier stage in the first partial frequency band, anda further first pass filter coupled to the first matching network, wherein the further first pass filter is configured to pass the first partial frequency band; a second partial frequency path coupled to the total high-frequency path, wherein the second partial frequency path includes
a second pass filter configured to pass a second partial frequency band,a second matching network coupled to the second pass filter, wherein the second matching network is configured to match the high-frequency amplifier stage in the second partial frequency band, anda further second pass filter coupled to the second matching network, wherein the further second pass filter is configured to pass the second partial frequency band; and a coupling to an output of the first and second partial frequency paths, wherein the coupling combines an output of the first and second partial frequency paths into the total high-frequency path, wherein one of the first and second partial frequency paths is coupled to a control signal line that is configured to control switching of the one of the first and second partial frequency paths, wherein the one of the first and second partial frequency paths that is coupled to the control signal line comprises:
a first switch arranged an input the matching network of the one of the first and second partial frequency paths that is coupled to the control signal line; anda second switch arranged on an output side of the matching network of the one of the first and second partial frequency paths that is coupled to the control signal line,wherein the first and second switches are configured so that when a control signal is applied via the control signal line, the one of the first and second partial frequency paths is shorted to ground, which reflects signals in the one of the first and second partial frequency paths.