Murata Manufacturing Co., Ltd.

Sadao Kotera

Kazunori Kinoshita

Yoji Maeda

Eiichi Hibino

Hiroshi Taniguchi

A tuner circuit includes a variable attenuator circuit including a PIN diode, disposed upstream of a variable-gain amplifier circuit and controlled according to the same AGC voltage used to control the variable-gain amplifier circuit. The operations of the variable-gain amplifier circuit and the variable attenuator circuit in relation to the AGC voltage are set such that when an input RF signal is at a maximum assumed level, a direct current that flows through the PIN diode will be less than a value of a direct current that maximizes intermodulation distortion.

Tuner circuit

An electronic component is mounted on one major surface of a dual side wiring substrate. A terminal is press-fitted into a mounting hole in the dual side wiring substrate from the one major surface side to be temporarily fixed in the substrate, and an electronic component is mounted on the other major surface of the dual side wiring substrate after soldering paste is applied. A frame having a plurality of bent pieces extending inwardly is mounted onto the dual face wiring substrate from a position above the substrate so that the bent pieces abut against the pattern of the dual side wiring substrate. The terminal press-fitted from the one major surface side, the electronic component mounted on the other major surface, and the frame are soldered simultaneously by a reflow method.

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Kusatsu, Japan

Sadao Kotera