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    • 3. 发明授权
    • Cascode amplifier and differential cascode voltage-controlled oscillator using the same
    • 串联放大器和差分共源共栅压控振荡器使用
    • US07821349B2
    • 2010-10-26
    • US12193204
    • 2008-08-18
    • Bong-Hyuk ParkSeung-Sik LeeSeung-Hyun JangSang-Sung Choi
    • Bong-Hyuk ParkSeung-Sik LeeSeung-Hyun JangSang-Sung Choi
    • H03B5/12H03F3/191
    • H03F1/223H03B5/1212H03B5/1215H03B5/1228H03B5/1243H03F1/26H03F3/19H03F2200/108H03F2200/372H03F2200/451
    • Provided is a differential cascode voltage-controlled oscillator that can reduce a phase noise by the use of a quality factor enhancement technique with negative conductance and can mitigate a ground-caused noise effect by the use of a cascode connection technique. The differential cascode voltage-controlled oscillator includes an AC signal generator, and first through fourth cascode amplifiers. The AC signal generator generates an AC signal with a certain frequency according to a control voltage. The first cascode amplifier is connected in a cascode configuration, and amplifies the AC signal to output the resulting signal to a first output terminal. The second cascode amplifier is connected in a cascode configuration and connected to the first cascode amplifier in a cross-coupled configuration, to amplify the AC signal to output the resulting signal to a second output terminal. The third cascode amplifier is connected in a cascode configuration to amplify the AC signal to output the resulting signal to the first output terminal. The fourth cascode amplifier is connected in a cascode configuration and connected to the third cascode amplifier in a cross-coupled configuration, to amplify the AC signal to output the resulting signal to the second output terminal. Herein, the first and second cascode amplifiers and the third and fourth cascode amplifiers are symmetrically connected to differentially amplify the AC signal.
    • 提供了一种差分共源共栅压控振荡器,其可以通过使用具有负电导的品质因子增强技术来减少相位噪声,并且可以通过使用共源共栅连接技术来减轻地面引起的噪声影响。 差分共源共栅压控振荡器包括AC信号发生器和第一至第四共源共栅放大器。 交流信号发生器根据控制电压产生一定频率的交流信号。 第一共源共栅放大器以共源共极配置连接,并且放大AC信号以将得到的信号输出到第一输出端。 第二级联放大器以共源共栅配置连接并且以交叉耦合配置连接到第一共源共栅放大器,以放大AC信号以将所得到的信号输出到第二输出端子。 第三共源共栅放大器以共源共极配置连接以放大AC信号,以将结果信号输出到第一输出端。 第四共源共栅放大器以共源共极配置连接并以交叉耦合配置连接到第三共源共栅放大器,以放大AC信号以将结果信号输出到第二输出端。 这里,第一和第二共源共栅放大器和第三和第四共源共栅放大器对称地连接以差分放大AC信号。
    • 4. 发明授权
    • Apparatus for adjusting frequency characteristic and Q factor of low pass filter and method thereof
    • 用于调整低通滤波器的频率特性和Q因子的装置及其方法
    • US07564301B2
    • 2009-07-21
    • US11927904
    • 2007-10-30
    • Seung-Sik LeeBong-Hyuk ParkChang-Wan KimSang-Sung Choi
    • Seung-Sik LeeBong-Hyuk ParkChang-Wan KimSang-Sung Choi
    • H03K5/00
    • H03H7/0153H03H11/1291
    • Provided are an apparatus for adjusting frequency characteristic and Q factor of a low pass filter (LPF) and a method thereof. The apparatus includes: a frequency comparing unit for calculating a first square value and a second square value, and comparing a first reference value with the first and the second square values; a frequency adjusting unit for adjusting the frequency characteristic to range the first reference value between the first square value and the second square value; a Q factor comparing unit for calculating a third square value, and comparing a second and a third reference values with the third square value; a control unit for activating the Q factor comparing unit when the frequency characteristic is completely adjusted; and a Q factor adjusting unit for adjusting the Q factor to range the third square value between the second reference value and the third reference value.
    • 提供一种用于调整低通滤波器(LPF)的频率特性和Q因子的装置及其方法。 该装置包括:频率比较单元,用于计算第一平方值和第二平方值,并将第一参考值与第一和第二平方值进行比较; 频率调整单元,用于调整频率特性以使第一参考值在第一平方值和第二平方值之间变化; 用于计算第三平方值的Q因子比较单元,以及将第二和第三参考值与第三平方值进行比较; 控制单元,用于当频率特性被完全调整时激活Q因子比较单元; 以及Q因子调整单元,用于调整Q因子以使第三平方值在第二参考值和第三参考值之间。
    • 8. 发明授权
    • Dual-band wideband local oscillation signal generator
    • 双频宽带本地振荡信号发生器
    • US08174328B2
    • 2012-05-08
    • US12860530
    • 2010-08-20
    • Bong-Hyuk ParkKwang-Chun LeeHyun-Kyu Chung
    • Bong-Hyuk ParkKwang-Chun LeeHyun-Kyu Chung
    • H03B21/01H03B21/02H03B21/04H03B27/00H04B1/26H04B1/28
    • H03L7/099
    • A dual-band wideband local oscillation signal generator includes an oscillation unit, a division unit, a poly phase filter (PPF), a switch unit, and a single side band (SSB) mixer. The oscillation unit is configured to generate a positive in-phase (IP) signal, a negative in-phase (IN) signal, a negative quadrature-phase (QN) signal, and a positive quadrature-phase (QP) signal. The division unit is configured to divide frequencies of the IP signal and the IN signal and generate an RF signal. The PPF is configured to receive the IP signal and the IN signals inputted to the division unit, and generate an LO IP signal, an LO IN signal, an LO QP signal, and an LO QN signal. The switch unit is configured to receive the generated LO signals and select a high band frequency signal or a low band frequency signal.
    • 双频宽带本地振荡信号发生器包括振荡单元,分频单元,多相滤波器(PPF),开关单元和单边带(SSB)混频器。 振荡单元被配置为产生正同相(IP)信号,负同相(IN)信号,负正交相位(QN)信号和正正交相位(QP)信号。 分割单元被配置为分配IP信号和IN信号的频率并产生RF信号。 PPF被配置为接收输入到分割单元的IP信号和IN信号,并且生成LO IP信号,LO IN信号,LO QP信号和LO QN信号。 开关单元被配置为接收所生成的LO信号并选择高频带信号或低频信号。
    • 9. 发明授权
    • Controlled-gain wideband feedback low noise amplifier
    • 控制增益宽带反馈低噪声放大器
    • US08102214B2
    • 2012-01-24
    • US12868468
    • 2010-08-25
    • Bong-Hyuk ParkKwang-Chun Lee
    • Bong-Hyuk ParkKwang-Chun Lee
    • H03F1/34
    • H03F1/223H03F1/342H03F3/19H03F3/72H03F2200/294H03F2200/36H03F2200/408H03F2203/7209
    • Provided is controlled-gain wideband feedback low-noise amplifier. The controlled-gain wideband feedback low-noise amplifier includes: a feedback amplifier configured to isolate an input signal and an output signal obtained by amplifying the input signal, feed back the output signal to the input signal to amplify wideband input signals, resonate a low-frequency band signal among the wideband input signals to amplify the low-frequency band signal among the wideband input signals, and be switched in accordance with a control signal to control an amplification gain of the low-frequency band signal among the wideband input signals; and a cascode amplifier configured to amplify a high-frequency band signal among the wideband signals inputted from the feedback amplifier, and be switched in accordance with a control signal to control an amplification gain of the high-frequency band signal among the wideband signals.
    • 提供控制增益宽带反馈低噪声放大器。 受控增益宽带反馈低噪声放大器包括:反馈放大器,被配置为隔离输入信号和通过放大输入信号获得的输出信号,将输出信号反馈到输入信号以放大宽带输入信号,共振低 宽频带输入信号中的频带信号,以放大宽带输入信号之中的低频带信号,并根据控制信号进行切换,以控制宽带输入信号中的低频带信号的放大增益; 以及级联放大器,被配置为放大从反馈放大器输入的宽带信号中的高频带信号,并且根据控制信号进行切换,以控制宽带信号中的高频带信号的放大增益。