Tuner for diversity reception

Abstract

A tuner for diversity reception, setting a first integrated circuit 2 constitued a first tuning circuit and a second integrated circuit 3 constitued a second tuning circuit in a circuit basal palte 1 having a plurality of connecting terminals, setting a reference signal generate circuit 4 shared by the first and second tuning circuit between the first and second integrated circuit, the first and second integrated circuit comprising: one side having input / output terminals for receiving RF signal towards outside of the circuit basal palte, the other side having educing terminal connecting with the reference signal generate circuit towards installing direction of the reference signal generate circuit, connecting connecting terminals 5 of two ends of the circuit basal palte 1 having a plurality of connecting terminals 5 with input / output terminals for receiving RF signal of the first and second integrated circuit via circuit diagram. Thereby a tuner for diversity reception is provided can raise high frequencys of each integrated circuit when using independent integrated circuit to compose tuning circuit.

Description

technical field [0001] The present invention relates to a tuner (tuner) for diversity (diversity) reception, and in particular, when forming a diversity tuner using a first integrated circuit constituting a first tuner circuit and a second integrated circuit constituting a second tuner circuit, improving A tuner for diversity reception that isolates high-frequency signals processed by the first and second tuner circuits. Background technique [0002] In general, a tuner for diversity reception is composed of at least two tuning circuits connected in parallel. The two tuning circuits have the same function and respectively have a local oscillation circuit, a PLL circuit, and a mixer. The local oscillation circuit It is composed of a high-frequency amplification section, a high-frequency signal selection filter and a voltage-controlled oscillation circuit. Furthermore, in recent years, in order to reduce the volume occupied by mounting individual tuner circuits in this divers...

AI Technical Summary

Problems solved by technology

[0010] The tuner 30 for diversity reception disclosed in the aforementioned Japanese Unexamined Patent Publication No. 2005-130279 shares the voltage-controlled oscillator and the PLL circuit respectively used in the first and second tuning circuits 31 and 32, and only sets the voltage in the first tuning circuit 31. The oscillator and the PLL circuit are controlled, so the manufacturing cost of this part can be reduced, and the occupied volume can be reduced. However, when the first tuning circuit 31 and the second tuning circuit 32 are independently constituted by an integrated circuit, because the integrated circuit needs to be close to the configuration, so it is difficult to achieve the improvement of the high-frequency isolation between the integrated circuits

Images