| 摘要 |
PURPOSE:To provide excellent temperature characteristics, by using a gyrator consisting of passive elements as matching circuit, and giving correlativity between the temperature coefficient of the passive elements and the temperature characteristics of piezoelectric element of a transducer. CONSTITUTION:A gyrator 10 in n type connection in which an inductance L1 is inserted between parallel connection of two capacitors C1 and C2, is inserted between input terminals 1, 2 and an input transducer 5, and a gyrator 11 consisting of capacitors C3, C4 and an inductance L2 similarly is inserted between output terminals 8, 9 and an output transducer 5'. The temperature characteristics of the inductances L1, L2 and capacitors C1, C3 are suitably selected, allowing to coincide with the temperature characteristics of impedances Z1, Z2 viewing a signal source and a load via the gyrators 10, 11 from a lead 4 of the transducers 5, 5', with those of an impedance ZL of a mechanical filter. |
