IMPROVED FEED FORWARD NOISE REDUCTION IN A TRANSMITTER

IMPROVED FEED FORWARD NOISE REDUCTION IN A TRANSMITTER

A circuit (200, 400, 500, 600, 700) for use in a transmitter in a base station in a wireless cellular access system, comprising a main line with a first filter (210) arranged in the main line with an input side (220) and an output side (230) in the main line. The circuit additionally comprises a fee...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: PLAHN, Joakim, HELLBERG, Richard, KLINBERG, Mats
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
AMPLIFIERS
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
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Beschreibung
Zusammenfassung:A circuit (200, 400, 500, 600, 700) for use in a transmitter in a base station in a wireless cellular access system, comprising a main line with a first filter (210) arranged in the main line with an input side (220) and an output side (230) in the main line. The circuit additionally comprises a feed forward cancellation loop with a second filter (240), the cancellation loop also having an input point (250) and an output point (260). The cancellation loop is connected to the main line with the output point (260) of the cancelation loop being connected to the main line on the output side (230) of the first filter (210). Suitably, the first filter (210) i.e. the main line filter, is a bandpass filter.