INTEGRATED TUNER CIRCUIT

摘要

The invention relates to an integrated tuner circuit, preferably to a TV-tuner circuit using double conversion. It is a major purpose of the invention to modify a prior art tuner circuit in a way such that a high degree of integration is achieved. This is contrary to the state of the art in which tuners comprise many discrete components and comprise a lot of adjusting and alignment points. A high degree of integration will substantially reduce the costs, not only production costs but also costs accompanying the complex adjusting procedure. Also, by increasing the degree of integration dimensions may be substantially reduced. In view of the above purpose the invention provides an integrated tuner circuit having a first polyphase filter (10) at the input side of a fully complex mixer (13), and a second polyphase filter (15) at the output of the fully complex mixer (13).