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    • 4. 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。
    • 7. 发明授权
    • Automated qualitative mask fit tester
    • 自动定性面膜适合测试仪
    • US08276587B2
    • 2012-10-02
    • US12372082
    • 2009-02-17
    • Hai ZhangWill ZantoQian ShiGreg OlsonPhillip PoeschlVincent MajkowskiStuart J. Olstad
    • Hai ZhangWill ZantoQian ShiGreg OlsonPhillip PoeschlVincent MajkowskiStuart J. Olstad
    • A61M16/00A61M16/14A61M15/00
    • A61M11/06A61M2016/0027A61M2205/075A61M2205/50A61M2209/02
    • A hand-held, automated qualitative fit tester (QLFT) for establishing gas mask fit integrity. The automated QLFT may be configured to utilize a pressure source in combination with a cartridge and a nebulizer to generate aerosols having size distributions and concentrations that are substantially the same as OSHA-approved manual units. The QLFT may further include a cartridge that contains the aerosol solution used to test mask integrity. The cartridge may be configured to recapture solution that collects on the interior walls of the nebulizer. The automated QLFT may also be equipped with a microprocessor for executing sequences that are in substantive compliance with 29 CFR 1910.134 and for writing to a data storage device. The automated aspects of the invention can reduce or negate the need for operating personnel to repeatedly and manually actuate a squeeze ball and record results manually, as is required with present OSHA-approved hand-held aerosol generators.
    • 一种用于建立防毒面具配合完整性的手持式自动定性适合测试仪(QLFT)。 自动化QLFT可以被配置为利用与筒和喷雾器组合的压力源来产生具有与OSHA认可的手动单元基本相同的尺寸分布和浓度的气溶胶。 QLFT还可以包括含有用于测试掩模完整性的气溶胶溶液的盒。 墨盒可以被配置为重新捕获在雾化器的内壁上收集的溶液。 自动化QLFT还可以配备微处理器,用于执行实质上符合29 CFR 1910.134的序列以及写入数据存储设备。 本发明的自动化方面可以减少或否定操作人员重复和手动地致动挤压球并且手动记录结果的需要,如现在的OSHA认可的手持式气溶胶发生器所要求的。
    • 8. 发明申请
    • DC offset cancellation in a direct-conversion receiver
    • 直接转换接收机中的直流偏移消除
    • US20050110550A1
    • 2005-05-26
    • US10719833
    • 2003-11-24
    • Qian ShiLiang DaiKevin Wang
    • Qian ShiLiang DaiKevin Wang
    • H03D3/00H03F3/45H03L5/00
    • H03F3/45991H03D3/008H03F3/45973H03F2200/294H03F2200/372
    • The DCOC block is used in ZIF BB to form HPF function to cancel dc offset with a penalty of small silicon area and low power consumption. It is a LPF plus a voltage to current conversion (VIC) resistor, and can hook up with any BB opamp used in signal path, to form a feedback loop, with or without signal gain stages in the loop. The BB opamp is used as a summing point. The summing method is input current summing. The cutoff frequency of the HPF function is thus defined by the integrator, the VIC resistor, and the feedback resistor in the summing opamp. The presence of the VIC resistor can drastically reduce the integrator capacitor and resistor values and thus save silicon area or improve receiver performance.
    • 在ZIF BB中使用DCOC块形成HPF功能,以小的硅面积和低功耗的损失来消除直流偏移。 它是一个LPF加上电压 - 电流转换(VIC)电阻,并且可以连接在信号通路中使用的任何BB运算放大器,形成一个反馈回路,在回路中有或没有信号增益级。 BB运算符用作求和点。 求和方法为输入电流求和。 因此,HPF功能的截止频率由积分器,VIC电阻和求和运算放大器中的反馈电阻器定义。 VIC电阻的存在可以显着降低积分器电容和电阻值,从而节省硅面积或提高接收机性能。