JPH10328186A5

JPH10328186A5 -

Info

Publication number: JPH10328186A5
Application number: JP1997154283A
Authority: JP
Filing date: 1997-05-29
Publication date: 2005-04-07
Anticipated expiration: 2017-05-29

Description

【００１０】
【課題を解決するための手段】
上記目的を達成するために、本発明によるスイッチ回路は、バイアス電流を制御することにより導通、非導通が制御される第一のダイオードを有し、入力信号を開閉するスイッチ回路において、上記バイアス電流をバイパスする経路に設けられた第二のダイオードと、上記第一のダイオード及び上記第二のダイオードに流れる電流を制御する回路とを具備したものである。
[0010]
[Means for solving the problem]
In order to achieve the above object, a switch circuit according to the present invention has a first diode whose conduction/non-conduction is controlled by controlling a bias current, and in the switch circuit which switches an input signal, the switch circuit is equipped with a second diode provided in a path which bypasses the bias current, and a circuit which controls the current flowing through the first diode and the second diode .

また、関連発明としての超音波診断装置は、複数の振動子素子が配列され超音波を送受波する探触子と、この探触子内の各振動子素子に所定の遅延時間を与えて超音波打ち出しの駆動パルスを印加する送波パルス発生器と、この送波パルス発生器から上記探触子へ印加される送波パルスと該探触子からの受波信号とを切り換える送受分離回路と、この送受分離回路を介して出力される探触子からの受波信号を増幅する受信増幅器と、この受信増幅器からの受波信号に所定の遅延時間を与える遅延回路を有しこれらの遅延回路で位相が揃えられた受波信号を加算して出力する整相回路と、この整相回路で整相された信号を検波する検波器と、この検波器からの出力信号を画像として表示する表示装置とを備えて成る超音波診断装置において、上記送受分離回路として、バイアス電流を制御することにより導通、非導通が制御される第一のダイオードと、上記バイアス電流をバイパスする経路に設けられた第二のダイオードと、上記第一のダイオード及び上記第二のダイオードに流れる電流を制御する回路とを具備したスイッチ回路を備えた。
Also, an ultrasonic diagnostic apparatus as a related invention comprises a probe in which a plurality of transducer elements are arranged to transmit and receive ultrasonic waves, a transmission pulse generator that applies a drive pulse for transmitting ultrasonic waves to each transducer element in the probe with a predetermined delay time, a transmission/reception separation circuit that switches between the transmission pulse applied to the probe from the transmission pulse generator and the reception signal from the probe, a reception amplifier that amplifies the reception signal from the probe output via the transmission/reception separation circuit, and a delay circuit that gives a predetermined delay time to the reception signal from the reception amplifier, and these delays In an ultrasonic diagnostic apparatus comprising a phasing circuit that adds and outputs received signals whose phases have been aligned in a circuit, a detector that detects the signals phased by the phasing circuit, and a display device that displays the output signal from the detector as an image, the transmission/reception separation circuit comprises a switch circuit that includes a first diode whose conduction/non-conduction is controlled by controlling a bias current, a second diode provided in a path that bypasses the bias current, and a circuit that controls the current flowing through the first diode and the second diode.

Claims

A switch circuit for switching an input signal, having a first diode whose conduction/non-conduction is controlled by controlling a bias current, characterized in that the switch circuit further comprises a second diode provided in a path that bypasses the bias current, and a circuit that controls the current flowing through the first diode and the second diode .

an ultrasonic diagnostic device comprising: a probe in which a plurality of transducer elements are arranged to transmit and receive ultrasonic waves; a transmission pulse generator that applies a drive pulse for transmitting ultrasonic waves to each transducer element in the probe with a predetermined delay time; a transmission/reception separation circuit that switches between the transmission pulse applied to the probe from the transmission pulse generator and a reception signal from the probe; a reception amplifier that amplifies the reception signal from the probe output via the transmission/reception separation circuit; a phasing circuit that has a delay circuit that applies a predetermined delay time to the reception signal from the reception amplifier and adds and outputs the reception signals whose phases have been aligned by these delay circuits; a detector that detects the signal phased by the phasing circuit; and a display device that displays the output signal from the detector as an image;
the transmission/reception separation circuit comprises a switch circuit including a first diode whose conduction/non-conduction is controlled by controlling a bias current, a second diode provided in a path that bypasses the bias current, and a circuit that controls the current flowing through the first diode and the second diode.