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1. 发明授权

US06181181B2 Phase shifter for a quadrature modulator and an image suppression mixer 失效
标题翻译：用于正交调制器和图像抑制混频器的移相器
公开(公告)号：US06181181B2
公开(公告)日：2001-01-30
申请号：US09260483
申请日：1999-03-02
申请人： Masahiro Tsukahara , Koju Aoki
发明人： Masahiro Tsukahara , Koju Aoki
IPC分类号： H03K300
CPC分类号： H03C3/40 , H03H11/20
摘要： A phase shifter that may be used in a quadrature modulator or an image suppression mixer. The phase shifter includes a low pass filter that receives an input signal and generates a first carrier signal. A high pass filter also receives the input signal and generates a second carrier signal. A phase difference detection circuit connected to the high and low pass filters receives the first and second carrier signals and generates a control signal based on the phase difference between the carrier signals. The control signal is fed back to at least one of the low pass filter and the high pass filter to compensate for phase errors caused by parasitic capacitance. The phase shifter has a small circuit area and is very accurate, allowing it to be used in communications devices.
摘要翻译：可用于正交调制器或图像抑制混频器的移相器。移相器包括接收输入信号并产生第一载波信号的低通滤波器。高通滤波器还接收输入信号并产生第二载波信号。连接到高通滤波器和低通滤波器的相位差检测电路接收第一和第二载波信号，并且基于载波信号之间的相位差产生控制信号。控制信号被反馈到低通滤波器和高通滤波器中的至少一个，以补偿由寄生电容引起的相位误差。移相器具有小的电路面积，并且非常精确，允许其在通信设备中使用。

2. 发明授权

US06225676B1 Semiconductor device with improved inter-element isolation 失效
标题翻译：具有改进的元件间隔离的半导体器件
公开(公告)号：US06225676B1
公开(公告)日：2001-05-01
申请号：US09252930
申请日：1999-02-19
申请人： Yoshinobu Hattori , Masahiro Tsukahara , Shinji Saito
发明人： Yoshinobu Hattori , Masahiro Tsukahara , Shinji Saito
IPC分类号： H01L2986
CPC分类号： H01L21/761 , H01L2924/0002 , H01L2924/00
摘要： A semiconductor device having multiple circuit elements capable of performing different functions and that operate at a high frequency includes island regions on which the circuit elements are located and isolation regions that surround the island regions and thus, the circuit elements. The island regions electrically separate the circuit elements from each other. A capacitor is connected between a substrate portion of the semiconductor device and ground. The isolation regions include a conductive region with a conductivity type opposite to the conductivity type of the substrate portion, such that a parasitic capacitor is formed between the substrate portion and the conductive region. The parasitic capacitor prevents signal leakage between the circuit elements and the island regions.
摘要翻译：具有能够执行不同功能并且以高频率工作的多个电路元件的半导体器件包括电路元件所在的岛状区域和围绕岛状区域以及因此电路元件的隔离区域。岛区域将电路元件彼此电分离。电容器连接在半导体器件的衬底部分和接地之间。隔离区域包括具有与衬底部分的导电类型相反的导电类型的导电区域，使得在衬底部分和导电区域之间形成寄生电容器。寄生电容器防止电路元件和岛区域之间的信号泄漏。

3. 发明授权

US06347221B1 Orthogonal modulator having a modulation mixer 失效
标题翻译：具有调制混频器的正交调制器
公开(公告)号：US06347221B1
公开(公告)日：2002-02-12
申请号：US09076706
申请日：1998-05-13
申请人： Masahiro Tsukahara , Koji Takekawa
发明人： Masahiro Tsukahara , Koji Takekawa
IPC分类号： H04B128
CPC分类号： H03C3/403 , H03D7/1408 , H03D7/1433 , H03D7/1458 , H03D2200/0047 , H03D2200/009
摘要： A modulation mixer includes a low cost circuit for reducing a carrier frequency leak. An orthogonal modulator including the modulation mixer may be formed on a single silicon substrate and does not need to be connected to an external transformer to suppress carrier frequency leak.
摘要翻译：调制混频器包括用于减少载波频率泄漏的低成本电路。包括调制混频器的正交调制器可以形成在单个硅衬底上，并且不需要连接到外部变压器以抑制载波频率泄漏。

4. 发明授权

US06275688B1 Double balanced mixer 失效
标题翻译：双平衡搅拌机
公开(公告)号：US06275688B1
公开(公告)日：2001-08-14
申请号：US09252931
申请日：1999-02-19
申请人： Minoru Takagi , Masahiro Tsukahara
发明人： Minoru Takagi , Masahiro Tsukahara
IPC分类号： H04Q720
CPC分类号： H03D7/145 , H03D7/1433 , H03D7/1458 , H03D2200/0043 , H03D2200/0084
摘要： A double balanced mixer which may be used in communications devices, such as portable or cellular telephones. The mixer includes a first differential amplifier having a first transistor pair whose emitters are connected together, a second differential amplifier having a second transistor pair whose emitters are connected together, and a third differential amplifier having a third transistor pair whose emitters are connected together by way of a resistor. A first constant current source is connected between the emitter of one of the transistors of the third transistor pair and ground. A second constant current source is connected between the emitter of the other transistor of the third transistor pair and ground. A gate circuit is connected to one of the first and second current sources for selectively activating the one connected current source. By selectively activating the current source, the mixer has low power consumption.
摘要翻译：双平衡混频器，可用于通信设备，如便携式或蜂窝电话。混频器包括具有发射极连接在一起的第一晶体管对的第一差分放大器，具有发射极连接在一起的第二晶体管对的第二差分放大器，以及发射极通过其连接在一起的第三晶体管对的第三差分放大器的电阻。第一恒流源连接在第三晶体管对的一个晶体管的发射极和地之间。第二恒流源连接在第三晶体管对的另一个晶体管的发射极和地之间。门电路连接到第一和第二电流源中的一个，用于选择性地激活一个连接的电流源。通过选择性地激活电流源，混频器具有低功耗。

5. 发明授权

US5708399A Modulator and frequency multiplier for use therein 失效
标题翻译：用于其中的调制器和倍频器
公开(公告)号：US5708399A
公开(公告)日：1998-01-13
申请号：US674506
申请日：1996-07-02
申请人： Ryota Fujii , Masahiro Tsukahara , Moriaki Mizuno , Minoru Takagi
发明人： Ryota Fujii , Masahiro Tsukahara , Moriaki Mizuno , Minoru Takagi
IPC分类号： H03D7/14 , H03B19/14 , H03C3/14 , H03D7/16 , H03B19/10 , H03C3/00
CPC分类号： H03D7/16
摘要： A modulator that effectively suppresses carrier leakage is disclosed. The modulator includes a frequency multiplier, a phase shifter and an orthogonal modulator. The frequency multiplier outputs complementary signals whose frequencies are twice the frequency of a first carrier signal. The phase shifter divides the frequencies of the output signals of the frequency multiplier to produce a plurality of second carrier signals whose phases are shifted by 90 degrees from one another. The orthogonal modulator receives an input signal and the second carrier signals from the phase shifter and outputs signals obtained by combining the input signal with the second carrier signals. The frequency multiplier has an input circuit section including a differential circuit. The differential input section receives complementary signals as the first carrier signal. The orthogonal modulator has an output circuit section including a differential circuit.
摘要翻译：公开了一种有效抑制载流子泄漏的调制器。调制器包括倍频器，移相器和正交调制器。倍频器输出其频率是第一载波信号频率的两倍的互补信号。移相器分频倍频器的输出信号的频率，产生相位彼此相差90度的多个第二载波信号。正交调制器从移相器接收输入信号和第二载波信号，并输出通过将输入信号与第二载波信号组合而获得的信号。倍频器具有包括差动电路的输入电路部分。差分输入部分接收互补信号作为第一载波信号。正交调制器具有包括差分电路的输出电路部分。

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