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    • 10. 发明申请
    • High-speed VCO calibration technique for frequency synthesizers
    • 用于频率合成器的高速VCO校准技术
    • US20060145776A1
    • 2006-07-06
    • US11028693
    • 2005-01-05
    • Qian ShiKevin Wang
    • Qian ShiKevin Wang
    • H03L1/00
    • H03L7/10H03L7/0891H03L7/18
    • The voltage-controlled oscillator (VCO) in a frequency synthesizer using a phase-locked loop (PLL) is calibrated digitally during power up. The VCO has a coarse frequency control and a fine frequency control. The coarse control is a digital phase-locked loop to quantize the broad frequency range into limited number of frequency steps with a clock frequency divided from the VCO frequency, and to hold the phase-locked dc control voltage for the fine control. By limiting the number of frequency steps and clocking at a divided frequency of the VCO, the coarse control is speeded up. The fine control is [connected to the charge pump output as in] a regular PLL. By searching for the optimal control setting, the center frequency of the VCO is trimmed close to the wanted frequency for the PLL to lock. This allows small VCO gain without losing the tolerance of process and temperature variations. As a result, the PLL phase noise performance is improved.
    • 在上电期间,使用锁相环(PLL)的频率合成器中的压控振荡器(VCO)进行数字校准。 VCO具有粗略的频率控制和精细的频率控制。 粗略控制是数字锁相环,用于将宽频率范围量化为有限数量的频率步长,时钟频率与VCO频率分开,并保持用于精细控制的锁相直流控制电压。 通过限制VCO的分频频率的频率步长和时钟频率,粗调控制被加速。 精细的控制是[连接到常规PLL的电荷泵输出]。 通过搜索最佳控制设置,VCO的中心频率被修剪成接近PLL的锁定频率。 这允许小的VCO增益,而不会失去工艺和温度变化的公差。 结果,提高了PLL相位噪声性能。