Title:
TRANSMISSION CIRCUIT OF ULTRASONIC DIAGNOSTIC APPARATUS
Document Type and Number:
Japanese Patent JP3857676
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To solve a problem of heat generation and to amplify an optional waveform with a low distortion factor even when the level of a transmission signal is varied.
SOLUTION: An ultrasonic diagnostic apparatus is constituted so as to generate a pair of pedestal clamp pulses (bias pulses) Vb1 and Vb2 each having a pulse width corresponding to an original transmission signal and having a bipolar symmetric property by a pedestal clamp circuit (a bias setting circuit) 30. A pseudo-linear amplifier 32 sets a bias point according to levels of the pulses Vb1 and Vb2, and linearly amplifies the original transmission signal only in the period of the pulse. Also, a drive power source variably sets electrical potentials HV1 and HV2 of the drive power source, and the level of the transmission signal outputted from the pseudo-linear amplifier 32 is variably set. Furthermore, an operating point is kept at a prescribed value by the levels of the pedestal clamp pulses Vb1 and Vb2.
Inventors:
Hiromichi Kikuchi
Kenichi Nakao
Kenichi Nakao
Application Number:
JP2003357351A
Publication Date:
December 13, 2006
Filing Date:
October 17, 2003
Export Citation:
Assignee:
Aloka Co., Ltd.
International Classes:
A61B8/00; G01N29/22; (IPC1-7): A61B8/00; G01N29/22
Domestic Patent References:
| JP7231247A | ||||
| JP1057373A | ||||
| JP62117533A | ||||
| JP3162838A |
Attorney, Agent or Firm:
Kenji Yoshida
Jun Ishida
Jun Ishida
Previous Patent: MOTOR-DRIVEN GATE DOOR DRIVING DEVICE
Next Patent: METHOD FOR DETECTING ANTIGEN BY IMMUNOHISTOCHEMICAL DYING
Next Patent: METHOD FOR DETECTING ANTIGEN BY IMMUNOHISTOCHEMICAL DYING