公开(公告)号：DE10392236T5

公开(公告)日：2005-03-03

申请号：DE10392236

申请日：2003-01-30

Applicant: ADVANTEST CORP

Inventor： ARAI MICHIAKI ,  NISHI MASANOBU

IPC: H03M1/18

公开(公告)号：JP2006211086A

公开(公告)日：2006-08-10

申请号：JP2005017934

申请日：2005-01-26

Applicant: Advantest Corp ,  株式会社アドバンテスト

Inventor： NISHI MASANOBU

IPC: H03F1/32 ,  H03F1/02

Abstract: PROBLEM TO BE SOLVED: To mount a low-power and low-distortion amplifier by a transistor.
SOLUTION: The amplifier 1 is provided with the transistor 10 to which an input signal (an input voltage Vin) is inputted from a base B and an output signal is outputted from a collector C, and a transformer 20 having a primary winding 20a and a secondary winding 20b. The primary winding 20a is connected to an emitter E of the transistor 10 via a capacitor 12 and a resistor 14. The secondary winding 20b is connected to the collector C of the transistor 10 via a capacitor 16. The polarity of the secondary winding 20b is made opposite to that of the primary winding 20a. The amplifier 1 can increase a load viewed from the emitter E of the transistor 10. Consequently, low-power and low-distortion amplification can be realized.
COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 要解决的问题：通过晶体管安装低功耗和低失真放大器。 解决方案：放大器1设置有从基极B输入输入信号（输入电压Vin）的晶体管10，并且从集电极C输出输出信号，并且具有初级绕组的变压器20 20a和次级绕组20b。 初级绕组20a通过电容器12和电阻器14连接到晶体管10的发射极E.次级绕组20b通过电容器16连接到晶体管10的集电极C.次级绕组20b的极性是 与初级绕组20a相反。 放大器1可以增加从晶体管10的发射极E观察的负载。因此，可以实现低功率和低失真的放大。 版权所有（C）2006，JPO＆NCIPI

公开(公告)号：JP2002043909A

公开(公告)日：2002-02-08

申请号：JP2000226899

申请日：2000-07-27

Applicant: ADVANTEST CORP

Inventor： NISHI MASANOBU

IPC: H03H7/01 ,  H03H11/04 ,  H03K17/00

Abstract: PROBLEM TO BE SOLVED: To allow switching between a broad band filter characteristic and a narrow band filter characteristic without using a mechanical contact switch. SOLUTION: A signal changeover circuit of a differential amplifier type gives an input signal to a broadband filter or a narrow band filter selectively so as to provide the input signal to receive the broad band filter characteristic or the narrow band filter characteristic.