US 12,395,131 B2
Amplifier circuit and sonar
Futoshi Kondo, Nishinomiya (JP)
Assigned to FURUNO ELECTRIC CO., LTD., Nishinomiya (JP)
Filed by Furuno Electric Co., Ltd., Nishinomiya (JP)
Filed on Jan. 17, 2023, as Appl. No. 18/097,503.
Claims priority of application No. 22153209 (EP), filed on Jan. 25, 2022; application No. 22196686 (EP), filed on Sep. 20, 2022; and application No. 22207472 (EP), filed on Nov. 15, 2022.
Prior Publication US 2023/0238924 A1, Jul. 27, 2023
Int. Cl. G01S 7/524 (2006.01); G01S 7/52 (2006.01); H03F 1/56 (2006.01)
CPC H03F 1/565 (2013.01) [G01S 7/52 (2013.01); G01S 7/524 (2013.01); H03F 2200/387 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An amplifier circuit to be used in a sonar, the amplifier circuit comprising:
a transmission amplifier;
a transducer; and
a matching circuit arranged to connect the transmission amplifier to the transducer so as to form a series circuit,
wherein the transducer has a first impedance characteristic comprising a resonance frequency and an anti-resonance frequency higher than the resonance frequency, and
wherein the transducer connected to the matching circuit has a second impedance characteristic different from the first impedance characteristic, the second impedance characteristic comprising a first resonance frequency and a second resonance frequency higher than the first resonance frequency.