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1. 发明授权

US06169462A Oscillator with controlled current source for start stop control 有权
标题翻译：具有控制电流源的振荡器用于启动停止控制
公开(公告)号：US06169462A
公开(公告)日：2001-01-02
申请号：US09353240
申请日：1999-07-14
申请人： David Glenn White
发明人： David Glenn White
IPC分类号： H03B532
CPC分类号： H03K3/0307 , H03B5/06 , H03B5/36 , H03B2200/0094 , H03B2200/0096 , H03B2201/0208 , H03K3/014
摘要： A first inverter is provided with a feedback resistor for biasing the inverter to a linear operating range and an AC feedback path for causing oscillations to occur. A controlled current source, responsive to a control signal Vc supplied thereto and coupled to an input of the inverter supplies a current in a first sense thereto for enabling the oscillations and supplies a current in a second sense thereto for inhibiting the oscillations. The controlled current source comprises a second inverter for amplifying the control signal Vc to a logic level substantially greater than that of the first inverter and a current limiting resistor coupled in series with the second inverter for limiting current flow to and from the input of the first inverter.
摘要翻译：第一反相器设置有用于将反相器偏置到线性工作范围的反馈电阻器和用于引起振荡的AC反馈路径。受控电流源响应于提供给其的控制信号Vc并耦合到逆变器的输入端，以第一种方式向其提供电流以实现振荡，并将第二种方式的电流提供给其用于抑制振荡。受控电流源包括第二反相器，用于将控制信号Vc放大到大于第一反相器的逻辑电平的逻辑电平;以及与第二反相器串联耦合的限流电阻，用于限制电流流入和流出第一逆变器。

2. 发明授权

US06181217B2 VCXO with reduced PWM effects high slew rate conditions 有权
标题翻译： VCXO具有降低PWM效应的高转换速率条件
公开(公告)号：US06181217B2
公开(公告)日：2001-01-30
申请号：US09353221
申请日：1999-07-14
申请人： David Glenn White
发明人： David Glenn White
IPC分类号： H03B532
CPC分类号： H03B5/32 , H03B5/36 , H03B5/368
摘要： A VCXO having reduced PWM effects includes an inverter (U1) having a DC feedback path (Rf) for biasing the inverter to a linear operating range and having an AC feedback path (40) for causing oscillations to occur and for varying the frequency of said oscillations in accordance with a frequency control bias voltage, Vbias. The AC feedback path includes a tank circuit (28) comprising a crystal (X1) having a first plate (22) coupled to an output (2) of the inverter via a source resistance (Rx), coupled to a source of reference potential via a varactor diode (D1) and coupled to a source (R1,T2) of the bias voltage (Vbias). The crystal (X1) has a second plate (24) coupled to an input of the inverter and coupled to the source of reference potential via a capacitor (C2) of fixed value. The source resistance is of a relatively high value selected to substantially attenuate the bias voltage whereby both the input and the output terminals of the inverter are effectively isolated from the bias voltage source. Advantageously, the PWM effect is reduced, the tuning range is extended and crystal power dissipation is reduced.
摘要翻译：具有降低的PWM效应的VCXO包括具有DC反馈路径（Rf）的逆变器（U1），用于将逆变器偏置到线性工作范围并且具有用于引起振荡发生的AC反馈路径（40），并且用于改变所述根据频率控制偏置电压Vbias进行振荡。交流反馈路径包括一个包括晶体（X1）的储能电路（28），该晶体（X1）具有经由源极电阻（Rx）耦合到反相器的输出端（2）的第一板（22），耦合到参考电位源变容二极管（D1）并耦合到偏置电压（Vbias）的源极（R1，T2）。晶体（X1）具有耦合到反相器的输入的第二板（24），并通过固定值的电容器（C2）耦合到参考电位源。源电阻具有相对较高的值，其被选择为基本上衰减偏置电压，由此反相器的输入端和输出端都有效地与偏置电压源隔离。有利地，PWM效应降低，调谐范围扩大并且晶体功率消耗降低。

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