Matsushita Electric Industrial Co., Ltd.

Keisuke Utsunomiya

Terumoto Akatsuka

Motoyoshi Kitagawa

Haruki Owaki

A portable power amplifier includes portable encapsulating cases, a printed board incorporated in those encapsulating cases, and a power amplifying device mounted on this printed board. An antenna switch and an antenna are provided near the power amplifying device, which is connected to those components in a pattern. This structure improves heat dissipation efficiency of the portable power amplifier.

Portable power amplifier

A high power type voltage controlled oscillator (VCO) includes (a) an input terminal for receiving a controlling voltage, (b) a voltage controlled oscillating section (VCO section) to which the controlling voltage is supplied, (c) a power amplifier to which an output from the VCO section is supplied, (d) a matching circuit to which an output from the power amplifier is supplied, (e) an output terminal to which an output from the matching circuit is supplied, (f) inspection means for adjusting or inspecting independently the VCO section and the amplifier, (g) interference preventive means for preventing interference from the amplifier to the VCO section, (h) a heat sink for dissipating heat generated by the amplifier to outside, and (i) a board in which the elements described in (a)-(h) are accommodated. This structure allows a device such as a cellular phone to be assembled with higher productivity as well as downsized.

Voltage controlled oscillator with power amplifier

In an input circuit of a VHF television tuner tunable to the frequencies of a desired channel by varying a d.c. potential applied to a plurality of varactors provided therein, an impedance matching within the input circuit is carried out by adjusting the ratio of inductance of inductive elements provided for selecting the desired channel, and also one of the inductive elements is connected to a capacitor forming a wave trap therewith.

Growing community of inventors

Aichi, Japan

Keisuke Utsunomiya