公开(公告)号：US06987957B2

公开(公告)日：2006-01-17

申请号：US10382278

申请日：2003-03-05

Applicant: Takeo Suzuki ,  Shoichi Asano

Inventor： Takeo Suzuki ,  Shoichi Asano

IPC: H04N1/00

CPC classification number: H04B1/406

Abstract: A dual-band frequency converter unit, for selectively performing frequency conversion between a 2.4-GHz high-frequency-band signal or a 5-GHz high-frequency-band signal and a baseband signal by frequency mixing, includes a local oscillator for generating a local oscillation signal; a first frequency divider for generating a half-frequency signal of the local oscillation signal; and a second frequency divider for generating a quarter-frequency signal of the local oscillation signal. Frequency conversion between the 2.4-GHz high-frequency-band signal and the baseband signal is performed by frequency mixing using the half-frequency signal of the local oscillation signal. Frequency conversion between the 5-GHz high-frequency-band signal and the baseband signal is performed by frequency mixing using the local oscillation signal and the quarter-frequency signal of the local oscillation signal.

公开(公告)号：US07400197B2

公开(公告)日：2008-07-15

申请号：US11387938

申请日：2006-03-22

Applicant: Shoichi Asano ,  Kazuharu Aoki

Inventor： Shoichi Asano ,  Kazuharu Aoki

IPC: H03G3/30

CPC classification number: H03F3/24 ,  H03F1/30 ,  H03F1/302 ,  H03F3/04 ,  H03F3/45475 ,  H03F2200/447 ,  H03F2200/451 ,  H03F2200/504 ,  H03G1/04

Abstract: A gain control circuit capable of keeping a constant gain without being affected by ambient temperature includes a variable resistor element connected to a power supply terminal, a control unit for controlling the resistance value of the variable resistor element on the basis of a gain control voltage, an amplifying transistor that is supplied with a power supply voltage through the variable resistor element, a current detecting resistor that is interposed between the variable resistor element and a collector of the amplifying transistor, and a voltage detecting unit that detects a drop dropped by the current detecting resistor. The dropped voltage detected by the voltage detecting unit is fed back to the control unit to control the resistance value of the variable resistor element such that a current flowing through the current detecting resistor does not vary.

Abstract translation: 能够在不受环境温度影响的情况下保持恒定增益的增益控制电路包括连接到电源端子的可变电阻器元件，用于基于增益控制电压来控制可变电阻器元件的电阻值的控制单元， 通过可变电阻元件供给电源电压的放大晶体管，插在可变电阻元件和放大晶体管的集电极之间的电流检测电阻器，以及检测由电流下降的电压的电压检测单元 检测电阻。 由电压检测单元检测到的下降电压被反馈到控制单元以控制可变电阻元件的电阻值，使得流过电流检测电阻器的电流不变。

公开(公告)号：US20060255858A1

公开(公告)日：2006-11-16

申请号：US11387938

申请日：2006-03-22

Applicant: Shoichi Asano ,  Kazuharu Aoki

Inventor： Shoichi Asano ,  Kazuharu Aoki

IPC: H03F3/04 ,  H03F3/45

CPC classification number: H03F3/24 ,  H03F1/30 ,  H03F1/302 ,  H03F3/04 ,  H03F3/45475 ,  H03F2200/447 ,  H03F2200/451 ,  H03F2200/504 ,  H03G1/04

Abstract: A gain control circuit capable of keeping a constant gain without being affected by ambient temperature includes a variable resistor element connected to a power supply terminal, a control unit for controlling the resistance value of the variable resistor element on the basis of a gain control voltage, an amplifying transistor that is supplied with a power supply voltage through the variable resistor element, a current detecting resistor that is interposed between the variable resistor element and a collector of the amplifying transistor, and a voltage detecting unit that detects a drop dropped by the current detecting resistor. The dropped voltage detected by the voltage detecting unit is fed back to the control unit to control the resistance value of the variable resistor element such that a current flowing through the current detecting resistor does not vary.

Abstract translation: 能够在不受环境温度影响的情况下保持恒定增益的增益控制电路包括连接到电源端子的可变电阻器元件，用于基于增益控制电压来控制可变电阻器元件的电阻值的控制单元， 通过可变电阻元件供给电源电压的放大晶体管，插在可变电阻元件和放大晶体管的集电极之间的电流检测电阻器，以及检测由电流下降的电压的电压检测单元 检测电阻。 由电压检测单元检测到的下降电压被反馈到控制单元以控制可变电阻元件的电阻值，使得流过电流检测电阻器的电流不变。

公开(公告)号：US06177837B1

公开(公告)日：2001-01-23

申请号：US09320260

申请日：1999-05-26

Applicant: Kazuharu Aoki ,  Shoichi Asano

Inventor： Kazuharu Aoki ,  Shoichi Asano

IPC: H03F122

CPC classification number: H03F1/22 ,  H03H11/1213

Abstract: A feedback circuit is connected between the input electrode of amplifying element of an amplifying circuit of the initial stage and the output electrode of amplifying element of an amplifying circuit of the final stage. The feedback circuit is structured by a serial circuit of a voltage dropping means resulting in almost constant voltage drop regardless of an increase or decrease of current and a feedback resistor, and a bias voltage is supplied, via the feedback circuit, to an input electrode of the amplifying element in the amplifying circuit of the initial stage from an output electrode of the amplifying element in the amplifying circuit of the final stage. Thereby, current dissipation is reduced and signal loss is lowered.

Abstract translation: 反馈电路连接在初级放大电路的放大元件的输入电极和最终级的放大电路的放大元件的输出电极之间。 反馈电路由降压装置的串联电路构成，无论电流的增加或减少以及反馈电阻如何，导致几乎恒定的电压降，并且经由反馈电路将偏置电压提供给输入电极 在最终级的放大电路中的放大元件的输出电极的放大电路中的放大元件。 从而，电流消耗降低，信号损失降低。