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    • 2. 发明授权
    • Frequency conversion circuit
    • 变频电路
    • US07796968B2
    • 2010-09-14
    • US11878145
    • 2007-07-20
    • Hyeon Seok HwangSeung Min Oh
    • Hyeon Seok HwangSeung Min Oh
    • H04B1/26
    • H03D7/1441H03D7/1433H03D7/1458H03D7/1491H03D2200/0033H03D2200/0047
    • A frequency conversion circuit comprises an input stage composed of one or more transistors, the input stage outputting a current corresponding to a voltage-type RF signal which is input to the gate of the transistor; a frequency conversion stage receiving an LO signal, causing the output RF signal to transit by the frequency of the LO signal so as to output an IF signal, and detecting an output voltage of the IF signal; a bleeding transistor connected to the input stage, supplying a current corresponding to a DC voltage, applied to a gate-source stage thereof, as a bleeding current to the transistor of the input stage, and in an AC manner, operating complementarily with the input stage to control a current flowing in the frequency conversion stage; a common mode feedback circuit comparing an output voltage provided from the frequency conversion stage with a preset reference voltage, adjusting the output voltage such that the output voltage is equalized to the reference voltage, and directly feeding the adjusted output voltage to the bleeding transistor; and a load stage composed of resistors and distributing a power supply voltage to apply to the frequency conversion stage.
    • 频率转换电路包括由一个或多个晶体管组成的输入级,输入级输出对应于输入到晶体管的栅极的电压型RF信号的电流; 频率转换级接收LO信号,使得输出RF信号通过LO信号的频率转移,以输出IF信号,并检测IF信号的输出电压; 连接到输入级的出血晶体管,将施加到其栅极 - 源极级的对应于直流电压的电流作为输出级的晶体管的输出电流提供,并以AC方式与输入端互补地工作 控制在变频阶段流动的电流; 将从变频级提供的输出电压与预设参考电压进行比较的共模反馈电路,调整输出电压使得输出电压与参考电压相等,并将调整的输出电压直接馈送到出血晶体管; 以及由电阻器组成的负载级,并分配施加到变频级的电源电压。
    • 6. 发明申请
    • BIAS CURRENT GENERATING APPARATUS WITH ADJUSTABLE TEMPERATURE COEFFICIENT
    • 具有可调节温度系数的偏置电流发生装置
    • US20080180161A1
    • 2008-07-31
    • US12014041
    • 2008-01-14
    • Byeong Hak JOYoo Sam NaKyoung Seok ParkHyeon Seok HwangSeung Min Oh
    • Byeong Hak JOYoo Sam NaKyoung Seok ParkHyeon Seok HwangSeung Min Oh
    • H01L35/00
    • H03F1/301
    • There is provided a bias current generating apparatus capable of providing a bias current where a characteristic change is compensated, to one of an analog circuit and RF circuit where various characteristic changes occur according to a temperature, by generating bias currents having a plurality of temperature coefficients. The apparatus including: a positive temperature coefficient current generator generating a positive temperature coefficient current in direct proportion to an absolute temperature; a zero temperature coefficient current generator generating a zero temperature coefficient current constant regardless of the absolute temperature; and an adjustable temperature coefficient current generator generating and outputting an adjustable temperature coefficient current by amplifying the positive temperature coefficient current by A times, amplifying the zero temperature coefficient current by B times, adding the two amplified temperature coefficient currents, wherein a temperature coefficient of the adjustable temperature coefficient current is varied by adjusting sizes of the A and B.
    • 提供了一种偏置电流产生装置,其能够通过产生具有多个温度系数的偏置电流,将特性变化补偿的偏置电流提供给模拟电路和RF电路中的一个,其中根据温度发生各种特性变化 。 该装置包括:正温度系数电流发生器,其与绝对温度成正比地产生正温度系数电流; 产生零温度系数电流恒定的零温度系数电流发生器,与绝对温度无关; 以及可调温度系数电流发生器,通过将正温度系数电流放大A倍,并将零温度系数电流放大B倍,生成并输出可调温度系数电流,加上两个放大温度系数电流,其中, 调节温度系数电流可以通过调节A和B的尺寸来改变。
    • 8. 发明授权
    • Frequency synthesizer having multi-band voltage controlled oscillator
    • 具有多频段压控振荡器的频率合成器
    • US07834705B2
    • 2010-11-16
    • US12205192
    • 2008-09-05
    • Seung Won SeoSeung Min OhByeong Hak Jo
    • Seung Won SeoSeung Min OhByeong Hak Jo
    • H03L7/099H03L7/10
    • H03L7/10H03L7/099H03L7/18H03L2207/06
    • There is provided a frequency synthesizer including a multi-band voltage controlled oscillator having a plurality of voltage controlled oscillating cores outputting oscillation frequencies having different bands according to an input control voltage. Each of the voltage controlled oscillating cores outputs a frequency band divided into a plurality of bands, and the voltage controlled oscillating core operates by each of the divided bands, and one of the voltage controlled oscillating cores operates in one of the bands according to the control voltage. The frequency synthesizer further includes a comparator unit and an oscillation band-determining unit. The comparator unit compares the control voltage with a pre-set reference voltage range. The oscillation band-determining unit changes the band where the voltage controlled oscillating core operates into another one of the bands when the control voltage is out of the pre-set reference voltage range.
    • 提供了一种频率合成器,其包括具有根据输入控制电压输出具有不同频带的振荡频率的多个压控振荡核心的多频带压控振荡器。 每个压控振荡核心输出被划分成多个频带的频带,并且压控振荡核心由每个分频频带操作,并且一个压控振荡核心根据控制在一个频带中操作 电压。 频率合成器还包括比较器单元和振荡频带确定单元。 比较器单元将控制电压与预设参考电压范围进行比较。 当控制电压超出预设的参考电压范围时,振荡频带确定单元将电压控制的振荡磁芯的频带改变为另一个频带。
    • 10. 发明申请
    • FREQUENCY SYNTHESIZER HAVING MULTI-BAND VOLTAGE CONTROLLED OSCILLATOR
    • 具有多波段电压控制振荡器的频率合成器
    • US20090066425A1
    • 2009-03-12
    • US12205192
    • 2008-09-05
    • Seung Won SEOSeung Min OhByeong Hak Jo
    • Seung Won SEOSeung Min OhByeong Hak Jo
    • H03L7/00
    • H03L7/10H03L7/099H03L7/18H03L2207/06
    • There is provided a frequency synthesizer including a multi-band voltage controlled oscillator having a plurality of voltage controlled oscillating cores outputting oscillation frequencies having different bands according to an input control voltage. Each of the voltage controlled oscillating cores outputs a frequency band divided into a plurality of bands, and the voltage controlled oscillating core operates by each of the divided bands, and one of the voltage controlled oscillating cores operates in one of the bands according to the control voltage. The frequency synthesizer further includes a comparator unit and an oscillation band-determining unit. The comparator unit compares the control voltage with a pre-set reference voltage range. The oscillation band-determining unit changes the band where the voltage controlled oscillating core operates into another one of the bands when the control voltage is out of the pre-set reference voltage range.
    • 提供了一种频率合成器,其包括具有根据输入控制电压输出具有不同频带的振荡频率的多个压控振荡核心的多频带压控振荡器。 每个压控振荡核心输出被划分成多个频带的频带,并且压控振荡核心由每个分频频带操作,并且一个压控振荡核心根据控制在一个频带中操作 电压。 频率合成器还包括比较器单元和振荡频带确定单元。 比较器单元将控制电压与预设参考电压范围进行比较。 当控制电压超出预设的参考电压范围时,振荡频带确定单元将电压控制的振荡磁芯的频带改变为另一个频带。