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1. 发明授权

US06605996B2 Automatically gain controllable linear differential amplifier using variable degeneration resistor 有权
标题翻译：使用可变退化电阻自动增益可控线性差分放大器
公开(公告)号：US06605996B2
公开(公告)日：2003-08-12
申请号：US10039542
申请日：2001-12-31
申请人： Hyun Kyu Yu , Sang-Gug Lee , Mun Yang Park , Seong-Do Kim , Yong-Sik Youn , Seon-Ho Han , Nam-Soo Kim
发明人： Hyun Kyu Yu , Sang-Gug Lee , Mun Yang Park , Seong-Do Kim , Yong-Sik Youn , Seon-Ho Han , Nam-Soo Kim
IPC分类号： H03F345
CPC分类号： H03G1/007 , H03F3/45179 , H03F2203/45492 , H03G1/0023
摘要： An automatically gain controllable linear differential amplifier using a variable degeneration resistor is disclosed. The linear differential amplifier includes an input end, a bias current source, a load unit, a first MOS transistor and a second MOS transistor. The linear differential amplifiers of the present invention can control an amplifying gain according to an input signal and improve linearity IIP3 without needing additional power consumption caused by improving the linearity. The automatically gain controllable linear differential amplifier uses NMOS/PMOS transistor so an integration process of the amplifier can be implemented more conveniently and efficiently.
摘要翻译：公开了一种使用可变退化电阻的自动增益可控线性差分放大器。线性差分放大器包括输入端，偏置电流源，负载单元，第一MOS晶体管和第二MOS晶体管。本发明的线性差分放大器可以根据输入信号控制放大增益，并提高线性度IIP3，而不需要通过提高线性度而引起的附加功耗。自动增益可控线性差分放大器使用NMOS / PMOS晶体管，因此可以更方便，高效地实现放大器的集成过程。

2. 发明授权

US06615398B2 Method for dividing ROM and DDFS using the same method 有权
公开(公告)号：US06615398B2
公开(公告)日：2003-09-02
申请号：US10017315
申请日：2001-12-18
申请人： Hyun Kyu Yu , Seon-Ho Han , Mun Yang Park , Seong-Do Kim , Yong-Sik Youn , Lee-Sup Kim , Ki-Hyuk Sung , Byung-Do Yang , Young-Jun Kim
发明人： Hyun Kyu Yu , Seon-Ho Han , Mun Yang Park , Seong-Do Kim , Yong-Sik Youn , Lee-Sup Kim , Ki-Hyuk Sung , Byung-Do Yang , Young-Jun Kim
IPC分类号： G06F1750
CPC分类号： G06F1/0356 , G06F1/0328 , G06F2101/04 , G11C17/00
摘要： The present invention relates to a ROM division method for reducing the size of a ROM in a direct digital frequency synthesizer (DDFS), which is used to synthesize a frequency in a communication system requiring fast frequency conversion. A ROM consuming most energy in the system, a modified Nicholas architecture is brought forth to reduce the size of ROM. In this modified Nicholas architecture, a ROM is divided into coarse ROM and fine ROM to convert phase to sine value. The present invention divides the coarse ROM and the fine ROM into quantized ROM and error ROM respectively. Then, value stored in each ROM is segmented in certain intervals and the minimum quantized value in each of the section is stored in the quantized ROM, while the difference between the original ROM value and the quantized ROM value is stored in the error ROM. This way, the size of a ROM can be reduced. Phase value inputted in a DDFS, a sine value is calculated by adding the four ROM values, i.e., coarse-quantized ROM, coarse-error ROM, fine-quantized ROM and fine-error ROM.

3. 发明授权

US06940350B2 Amplifier and method for canceling nonlinearity in amplifier 失效
标题翻译：用于消除放大器非线性的放大器和方法
公开(公告)号：US06940350B2
公开(公告)日：2005-09-06
申请号：US10618507
申请日：2003-07-11
申请人： Yong-Sik Youn , Hyun-Kyu Yu , Mun-Yang Park
发明人： Yong-Sik Youn , Hyun-Kyu Yu , Mun-Yang Park
IPC分类号： H03F1/30 , H03F1/32 , H03F3/04 , H03F3/345 , H03F1/22
CPC分类号： H03F3/345 , H03F1/301 , H03F1/3205 , H03F3/04
摘要： An amplifier including an amplifier transistor that operates in an active region has main current flowing therethrough according to input voltage, and a linear transistor that is driven by offset positive-polarity input voltage to operate in a linear region and has auxiliary current flowing therethrough. The main current and auxiliary current are added to become output current. The offset positive-polarity voltage corresponds to the sum of AC component of the input voltage and an offset DC voltage. Here, a transistor stacked on the linear transistor is coupled to the amplifier transistor to secure the linear region operation of the linear transistor. The stacked transistor is driven by a voltage having polarity opposite to that of the input voltage.
摘要翻译：包括在有源区域中工作的放大器晶体管的放大器根据输入电压具有流过其中的主电流，以及由偏移正极性输入电压驱动以在线性区域中操作并具有辅助电流流过其中的线性晶体管。主电流和辅助电流相加，成为输出电流。偏移正极性电压对应于输入电压的交流分量和偏移直流电压之和。这里，堆叠在线性晶体管上的晶体管耦合到放大器晶体管，以确保线性晶体管的线性区域操作。堆叠晶体管由具有与输入电压的极性相反的极性的电压驱动。

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