| 摘要 |
PURPOSE:To eliminate the deterioration of an oscillation at the time of a high gain, and a frequency characteristic, and to stabilize a circuit by constituting the titled receiver of a mounting substrate having a receiving part resonance circuit and an amplifier circuit for amplifying a receiving signal by scores of dB or more, and a metallic plate which has been placed in parallel to the substrate, and also, has been fixed to a prescribed potential. CONSTITUTION:A metallic plate 13 which has been fixed to a prescribed potential (for instance, an earth) is placed so as to be opposed to an amplifier circuit. As a result, as for capacity coupling between an input part 1 and an output 3, the input part 1 and the output 3 can be replaced with a capacities 12 and 11 with respect to the metallic plate 13. When the metallic plate 13 is kept in a prescribed potential (for instance, an earth), the capacities 12 and 11 are considered to be independent, respectively, the capacities 12 and 11 can be considered to have been contained in a capacities 7 and 5, and as a result, an original circuit can be realized. In this way, even if the mounting density of the circuit board is high, and also, the gain is high, an amplifier circuit having a stable characteristic is obtained. |
