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    • 135. 发明授权
    • Wide range multi-modulus divider in fractional-N frequency synthesizer
    • 分数N频率合成器中的宽范围多模分频器
    • US08565368B1
    • 2013-10-22
    • US13481489
    • 2012-05-25
    • Juinn-Yan ChenSan-Chieh Chou
    • Juinn-Yan ChenSan-Chieh Chou
    • H03K21/00H03K23/00
    • H03K21/10H03K23/68
    • A multi-modulus divider includes a chain of n dual modulus divider cells in cascade and connected in a ripple configuration where the last (n-k) of the divider cells are state-parked dual modulus divider cells. The state-parked dual modulus divider cells are forced to a given logical state when the divider cell is bypassed. The state-parked dual modulus divider cells ensure that the multi-modulus divider can change between different number of cells without clock glitches or clock errors. The multi-modulus divider is therefore capable of achieving a wide division range with seamless transition between division ratios.
    • 多模式分配器包括级联的n个双模均衡器单元的链,并以波纹配置连接,其中分配器单元的最后(n-k)是状态驻留双模除法器单元。 当分频器电池旁路时,状态驻留双模除法器单元被强制为给定的逻辑状态。 状态驻留双模式分频器电池确保多模式分频器可在不同数量的单元之间切换,无需时钟毛刺或时钟错误。 因此,多模式分频器能够实现宽分割范围,并且在分频比之间无缝转换。
    • 136. 发明申请
    • COMPACT HIGH FREQUENCY DIVIDER
    • 紧凑型高频分频器
    • US20130271188A1
    • 2013-10-17
    • US13445075
    • 2012-04-12
    • Ngar Loong A. Chan
    • Ngar Loong A. Chan
    • H03B19/14
    • H03B19/14H03K3/35613H03K21/026H03K21/10
    • A frequency divider circuit having two stages of transistors has improved performance at low supply voltages. The circuit may include cross-coupled PMOS and NMOS transistors, in which the input signal to be frequency divided is supplied to the body of the PMOS and/or NMOS transistors. The input signal may be coupled to the PMOS and/or NMOS transistors through capacitive or inductive coupling. The input signal to the PMOS and/or NMOS transistors may be generated by a voltage controlled oscillator circuit. With the frequency divider circuit having inputs signals coupled to the body of the PMOS and/or NMOS transistors supply voltages as low as 0.5 Volts may be possible.
    • 具有两级晶体管的分频器电路在低电源电压下具有改进的性能。 电路可以包括交叉耦合的PMOS和NMOS晶体管,其中待分频的输入信号被提供给PMOS和/或NMOS晶体管的主体。 输入信号可以通过电容或电感耦合耦合到PMOS和/或NMOS晶体管。 可以通过压控振荡器电路产生到PMOS和/或NMOS晶体管的输入信号。 利用具有耦合到PMOS和/或NMOS晶体管的输入信号的分频器电路,可以提供低至0.5伏特的电压。
    • 137. 发明授权
    • Clock generation for N.5 modulus divider
    • N.5模数分频器的时钟生成
    • US08558575B1
    • 2013-10-15
    • US13427955
    • 2012-03-23
    • Brian Abernethy
    • Brian Abernethy
    • H03K19/21
    • H03K21/10H03K19/21H03K23/68H03L7/1803H03L7/1972H03L7/1974
    • A system is provided for generating an output clock used for N.5 modulus division. An edge-slip circuit accepts a modulus count, a divisor select signal, and a clock signal having a frequency greater than a modulus count frequency. The edge-slip circuit also has an input to accept an output clock signal, and an output to supply a clock slip signal (NE). An exclusive-or (XOR) has an input to accept a buffered clock signal (NF) and the clock slip signal (NE). The XOR has an output to supply the output clock signal. The output clock signal has a frequency equal to a buffered clock signal frequency, with no skipped clock edges, when the clock slip signal does not change logic levels. Alternatively, the output clock signal frequency is equal to the buffered clock signal frequency, with a skipped clock edge, when the clock slip signal changes logic levels.
    • 提供一种用于产生用于N.5模数分频的输出时钟的系统。 边缘滑移电路接受模数计数,除数选择信号和具有大于模数计数频率的频率的时钟信号。 边缘滑移电路还具有接收输出时钟信号的输入端和用于提供时钟滑差信号(NE)的输出。 异或(XOR)具有接受缓冲时钟信号(NF)和时钟转移信号(NE)的输入。 XOR具有输出以提供输出时钟信号。 当时钟滑移信号不改变逻辑电平时,输出时钟信号的频率等于缓冲的时钟信号频率,没有跳过的时钟沿。 或者,当时钟滑移信号改变逻辑电平时,输出时钟信号频率等于具有跳过时钟边沿的缓冲时钟信号频率。
    • 138. 发明授权
    • Frequency divider for generating output clock signal with duty cycle different from duty cycle of input clock signal
    • 用于产生输出时钟信号的分频器,占空比不同于输入时钟信号的占空比
    • US08502573B2
    • 2013-08-06
    • US13658809
    • 2012-10-23
    • Mediatek Inc.
    • Ming-Da Tsai
    • H03K21/00
    • H03K23/425G06F1/08H03K3/356173H03K21/023H03K21/10
    • A frequency divider includes a plurality of logic circuit blocks. Each of the logic circuit blocks has a plurality of control terminals. At least one of the control terminals of one of the logic circuit blocks is arranged to receive an input clock signal having a first duty cycle. At least one of the remaining control terminals of the one of the logic circuit blocks is arranged to couple another one of the logic circuit blocks by a positive feedback. A clock signal at the at least one of the remaining control terminals has a second duty cycle different from the first duty cycle. Each of the logic circuit blocks includes a plurality of first transistors coupled in parallel between a first reference voltage and an output terminal, and a plurality of second transistors coupled in series between a second reference voltage and the output terminal.
    • 分频器包括多个逻辑电路块。 每个逻辑电路块具有多个控制端子。 一个逻辑电路块的控制端中的至少一个被布置成接收具有第一占空比的输入时钟信号。 逻辑电路块中的一个的剩余控制端中的至少一个被布置成通过正反馈耦合另一个逻辑电路块。 所述剩余控制端中的至少一个的时钟信号具有与第一占空比不同的第二占空比。 每个逻辑电路块包括并联在第一参考电压和输出端之间的多个第一晶体管,以及串联耦合在第二参考电压和输出端之间的多个第二晶体管。
    • 139. 发明申请
    • HIGH SPEED COUNTER APPARATUS
    • 高速计数器
    • US20130156147A1
    • 2013-06-20
    • US13716006
    • 2012-12-14
    • Electronics and Telecommunications Research Institute
    • Kunal Jayant Dadia
    • H03K21/02
    • H03K21/026H03K21/10
    • Disclosed is a high speed counter apparatus. The high speed counter apparatus includes a first counter configured to perform a count on the lower bits of the final output signal in response to a first clock signal, a second counter configured to perform a count on the upper bits of the final output signal in response to a second clock signal, and a clock signal generator configured to generate the second clock signal from the first clock signal. In accordance with the present invention, power consumption and a bottleneck phenomenon in an upper bit counter can be reduced because a second clock signal for operating the upper bit counter is synchronized with a first clock signal for operating the lower bit counter at a frequency lower than that of the clock signal for operating the lower bit counter.
    • 公开了一种高速计数器装置。 高速计数器装置包括:第一计数器,被配置为响应于第一时钟信号对最终输出信号的低位执行计数;第二计数器,被配置为响应于对最终输出信号的高位进行计数 以及被配置为从第一时钟信号产生第二时钟信号的时钟信号发生器。 根据本发明,由于用于操作高位计数器的第二时钟信号与第一时钟信号同步,所以可以降低高位计数器中的功耗和瓶颈现象,以便以低于 用于操作低位计数器的时钟信号。