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    • 4. 发明授权
    • RF front end with reduced carrier leakage
    • 射频前端具有减少的载波泄漏
    • US06850748B2
    • 2005-02-01
    • US10207986
    • 2002-07-31
    • Eunseok SongSeung-Wook LeeJeong-Woo LeeJoonbae ParkKyeongho Lee
    • Eunseok SongSeung-Wook LeeJeong-Woo LeeJoonbae ParkKyeongho Lee
    • H04B1/28H04B1/52H04B1/00
    • H04B1/28H04B1/525
    • A method and apparatus that provide a frequency conversion in a radio frequency front-end are disclosed, including a frequency divider that divides an input signal frequency by a predetermined value to produce an output signal frequency; and a frequency mixer that mixes the output signal frequency with a carrier signal frequency to produce a converted signal frequency, which is substantially equal to a difference between the output signal frequency and the carrier signal frequency. The predetermined value and the input signal frequency are selected such that the carrier signal frequency is not substantially equivalent to an integer multiple of the output signal frequency. The method and apparatus can be used in a wireless communication receiver including wireless communication systems and wireless LAN systems.
    • 公开了一种在射频前端提供频率转换的方法和装置,包括将输入信号频率除以预定值以产生输出信号频率的分频器; 以及混频器,其将输出信号频率与载波信号频率进行混合,以产生基本上等于输出信号频率和载波信号频率之差的转换信号频率。 选择预定值和输入信号频率使得载波信号频率基本上不等于输出信号频率的整数倍。 该方法和装置可用于包括无线通信系统和无线LAN系统的无线通信接收机。
    • 7. 发明授权
    • Communication transmitter using offset phase-locked-loop
    • 通信发射机使用偏移锁相环
    • US06963620B2
    • 2005-11-08
    • US10284342
    • 2002-10-31
    • Kang-Yoon LeeEunseok SongJeong Woo LeeJoonbae ParkKyeongho Lee
    • Kang-Yoon LeeEunseok SongJeong Woo LeeJoonbae ParkKyeongho Lee
    • H03C3/09H04L27/04H03D3/24H04L27/12H04L27/20
    • H03C3/0966H03C3/0933
    • A translational-loop transmitter generates RF signals using at most one phase-locked-loop (PLL) circuit. In one embodiment, a single PLL generates two local oscillation signals. The first oscillation signal is mixed with a baseband signal to generate an intermediate frequency signal. The second oscillation signal is input into the translational loop to adjust a voltage-controlled oscillator to the desired carrier frequency. In order to perform this type of modulation, the frequencies of the local oscillation signals are set so that they are harmonically related to one another relative to the carrier frequency. Other embodiments generate only one oscillation signal. Under these conditions, the intermediate frequency signal is generated using the oscillation signal, and a frequency divider in the translational loop is used to generate a control signal for adjusting the voltage-controlled oscillator to the carrier frequency. In still other embodiments, a transmitter signal is generated without using any phase-locked-loop circuits. This is accomplished by generating an intermediate frequency signal using a crystal oscillator, and then using a frequency divider in a feedback loop to generate a control signal for adjusting the voltage-controlled oscillator to the carrier frequency. By minimizing the number of phase-locked-loop circuits in the transmitter, the size, cost, and power requirements of mobile handsets may be significantly reduced.
    • 平移环路发射器使用至多一个锁相环(PLL)电路产生RF信号。 在一个实施例中,单个PLL产生两个本地振荡信号。 第一振荡信号与基带信号混合以产生中频信号。 第二振荡信号被输入到平移回路中,以将压控振荡器调整到期望的载波频率。 为了执行这种类型的调制,本地振荡信号的频率被设置为使得它们相对于载波频率彼此谐波相关。 其他实施例仅产生一个振荡信号。 在这些条件下,使用振荡信号产生中频信号,并且使用平移环路中的分频器产生用于将压控振荡器调节到载波频率的控制信号。 在其他实施例中,产生发射机信号而不使用任何锁相环电路。 这是通过使用晶体振荡器产生中频信号,然后在反馈环路中使用分频器来产生用于将压控振荡器调节到载波频率的控制信号来实现的。 通过最小化发射机中的锁相环电路的数量,移动手机的尺寸,成本和功率要求可能会大大降低。
    • 8. 发明授权
    • System and method for suppressing noise in a phase-locked loop circuit
    • 用于抑制锁相环电路中的噪声的系统和方法
    • US06952125B2
    • 2005-10-04
    • US10689986
    • 2003-10-22
    • Youngho AhnEunseok SongYido KooJeong-Woo LeeJoonbae ParkKyeongho Lee
    • Youngho AhnEunseok SongYido KooJeong-Woo LeeJoonbae ParkKyeongho Lee
    • H03L7/197H03L7/06H03L7/08
    • H03L7/1978
    • A system and method for improving the signal-to-noise ratio of a frequency generator suppresses phase noise and noise generated from mismatches in the internal generator circuits. This is accomplished using a modulation scheme which shifts spurious noise signals outside the loop bandwidth of the generator. When shifted in this manner, the noise signals maybe removed entirely or to any desired degree using, for example, a filter located along the signal path of the generator. In one embodiment, a Sigma-Delta modulator controls the value of a pulse-swallow frequency divider situated along a feedback path of a phase-locked loop to achieve a desired level of noise suppression. In another embodiment, a reference signal input into a phase-locked loop is modulated to effect noise suppression. In another embodiment, the foregoing forms of modulation are combined to accomplish the desired frequency shift. Through these modulation techniques, the signal-to-noise ratio of the frequency generator may be substantially improved while simultaneously achieving faster lock times.
    • 用于提高频率发生器的信噪比的系统和方法抑制由内部发生器电路中的失配产生的相位噪声和噪声。 这是使用将发生器的环路带宽之外的杂散噪声信号移位的调制方案来实现的。 当以这种方式移位时,噪声信号可以使用例如沿着发生器的信号路径定位的滤波器被完全去除或达到任何期望的程度。 在一个实施例中,Σ-Δ调制器控制沿着锁相环路的反馈路径设置的脉冲吞咽分频器的值,以实现期望的噪声抑制水平。 在另一个实施例中,输入到锁相环的参考信号被调制以实现噪声抑制。 在另一个实施例中,组合上述形式的调制以实现期望的频移。 通过这些调制技术,可以显着提高频率发生器的信噪比,同时实现更快的锁定时间。