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    • 3. 发明授权
    • Digitally tunable capacitor
    • 数字可调谐电容
    • US08044701B1
    • 2011-10-25
    • US12905657
    • 2010-10-15
    • Jody Greenberg
    • Jody Greenberg
    • H03K5/00
    • H03J1/00H03B5/1215H03B5/1228H03B5/1265H03J2200/10
    • The disclosed device can contain a pair of switchable capacitors, one of which has the larger capacitance of the pair. Each of the switchable capacitors can include a capacitor in series with a switch. Both switchable capacitors can be connected in a parallel circuit that has a tunable capacitance. The ratio of the capacitances of the pair can approximately equal a ratio of mutually prime integers. In a particular case, the ratio of capacitances can approximately equal a ratio of two consecutive integers. The capacitance ratio can be called a weight or weight ratio. A switch controller can drive the pair of switchable capacitors with a pair of (M+1)-ary pulse width modulated signals, each of which has the same modulation period.
    • 所公开的装置可以包含一对可切换电容器,其中一个电容器具有较大的电容。 每个可开关电容器可以包括与开关串联的电容器。 两个可切换电容器可以连接在具有可调谐电容的并联电路中。 该对的电容的比率可以近似等于互相整数的比率。 在特定情况下,电容的比率可以近似等于两个连续整数的比率。 电容比可以称为重量或重量比。 开关控制器可以用一对(M + 1)个脉冲宽度调制信号驱动该对可切换电容器,每一个具有相同的调制周期。
    • 5. 发明申请
    • LOW-NOISE HIGH-STABILITY CRYSTAL OSCILLATOR
    • 低噪声高稳定性晶体振荡器
    • US20080122549A1
    • 2008-05-29
    • US11935271
    • 2007-11-05
    • Jody Greenberg
    • Jody Greenberg
    • H03L5/00
    • H03L5/00H03B5/364
    • Circuits, methods, and apparatus that provide low-noise, high-stability crystal oscillators having controlled-amplitude differential output signals and DC level control. A crystal oscillator circuit has two feedback loops, one for setting the DC level of its signals, the other for adjusting the amplitude of those signals. The DC level feedback loop can set the DC component of the oscillator signals to a voltage midway between two supply voltages. The amplitude control loop sets the amplitude of the output of the crystal oscillator signal to be within a range. The amplitude can be set to provide a maximum swing without clipping the supply voltages in order to provide high-stability and minimal jitter. The amplitude control circuit can also be digital for improved noise performance. The time constants of these two loops can be separated such that instabilities are avoided.
    • 提供具有受控幅度差分输出信号和DC电平控制的低噪声,高稳定性晶体振荡器的电路,方法和装置。 晶体振荡器电路具有两个反馈回路,一个用于设置其信号的直流电平,另一个用于调整这些信号的幅度。 DC电平反馈环路可以将振荡器信号的直流分量设置为两个电源电压之间的一个电压。 振幅控制回路将晶体振荡器信号的输出振幅设定在一个范围内。 可以设置幅度以提供最大摆幅而不削减电源电压,以便提供高稳定性和最小的抖动。 幅度控制电路也可以是数字的,以提高噪声性能。 这两个循环的时间常数可以分开,以避免不稳定。
    • 7. 发明授权
    • Low-noise high-stability crystal oscillator
    • 低噪声高稳定晶体振荡器
    • US07292114B2
    • 2007-11-06
    • US11242621
    • 2005-10-03
    • Jody Greenberg
    • Jody Greenberg
    • H03B5/32
    • H03L5/00H03B5/364
    • Circuits, methods, and apparatus that provide low-noise, high-stability crystal oscillators having controlled-amplitude differential output signals and DC level control. A crystal oscillator circuit has two feedback loops, one for setting the DC level of its signals, the other for adjusting the amplitude of those signals. The DC level feedback loop can set the DC component of the oscillator signals to a voltage midway between two supply voltages. The amplitude control loop sets the amplitude of the output of the crystal oscillator signal to be within a range. The amplitude can be set to provide a maximum swing without clipping the supply voltages in order to provide high-stability and minimal jitter. The amplitude control circuit can also be digital for improved noise performance. The time constants of these two loops can be separated such that instabilities are avoided.
    • 提供具有受控幅度差分输出信号和DC电平控制的低噪声,高稳定性晶体振荡器的电路,方法和装置。 晶体振荡器电路具有两个反馈回路,一个用于设置其信号的直流电平,另一个用于调整这些信号的幅度。 DC电平反馈环路可以将振荡器信号的直流分量设置为两个电源电压之间的一个电压。 振幅控制回路将晶体振荡器信号的输出振幅设定在一个范围内。 可以设置幅度以提供最大摆幅而不削减电源电压,以便提供高稳定性和最小的抖动。 幅度控制电路也可以是数字的,以提高噪声性能。 这两个循环的时间常数可以分开,以避免不稳定。