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    • 82. 发明公开
    • Multi-terminal MOS varactor
    • MOS-Varaktor mit mehrerenAnschlüssen
    • EP1333501A3
    • 2005-01-05
    • EP03250374.0
    • 2003-01-21
    • Sharp Kabushiki Kaisha
    • Adan, Alberto Oscar, c/o Sharp Kabushiki Kaisha
    • H01L29/93
    • H01L29/94H03B5/1215H03B5/1228H03B5/1253H03L7/099H03L2207/06
    • In a multi-terminal MOS varactor, a floating electrode 8 of a MOS capacitor (Cf) 5 is connected to one of two terminals of each of a plurality of capacitors (C1-Cn) 6-1 through 6-n. To the other terminals (Vg1-Vgn) 9-1 through 9-n of the respective capacitors (C1-Cn) 6-1 through 6-n, control voltages Vg1-Vgn are applied, and a terminal (Vn) 11 of the MOS capacitor (Cf) 5, the terminal being on the side of a well, receives a control voltage. In the multi-terminal MOS varactor with the arrangement above, it is possible to progressively change the valid electrostatic capacity C of the other terminal (Vgj) 9-j of an arbitrary capacitor (Cj) 6-j, by changing the control voltage. Since electrostatic capacity can be progressively changed in this MOS varactor, adopting this MOS varactor to an oscillator enables to control a frequency and sensitivity of the oscillator.
    • 在多端子MOS变容二极管中,MOS电容器(Cf)5的浮置电极8连接到多个电容器(C1-Cn)6-1至6-n中的每一个的两个端子中的一个。 对各电容器(C1〜Cn)6-1〜6-n的其他端子(Vg1〜Vgn)9-1〜9-n施加控制电压Vg1〜Vgn, MOS电容器(Cf)5,端子位于阱的一侧,接收控制电压。 在具有上述结构的多端子MOS变容二极管中,通过改变控制电压,可以逐渐改变任意电容器(Cj)6-j的另一个端子(Vgj)9-j的有效静电电容C. 由于在这个MOS变容二极管中可以逐渐改变静电容量,所以将这个MOS变容二极管应用于振荡器可以控制振荡器的频率和灵敏度。
    • 84. 发明公开
    • Phase lock loop gain control using unit current sources
    • Phasenregelschleifeverstärkungssteuerungmit Einheitsstromquellen
    • EP1244215A1
    • 2002-09-25
    • EP02252014.2
    • 2002-03-20
    • Broadcom Corporation
    • Gomez, Ramon A.
    • H03L7/00
    • H03L7/00H03B5/1212H03B5/1215H03B5/1228H03B5/1243H03B5/1253H03B5/1265H03B5/1278H03B2200/0046H03B2200/0048H03B2200/005H03B2201/02H03B2201/0208H03B2201/025H03D7/165H03D7/18H03J5/244H03J2200/10H03L7/0898H03L7/093H03L7/099H03L7/10H03L7/107H03L7/1072H03L7/18
    • A gain compensator compensates for the gain variation of a varactor-tuned voltage tuned oscillator (VCO) in a phase lock loop (PLL). The VCO (222) includes a parallel LC circuit (228) having multiple fixed capacitors that can be switched-in or switched-out of the LC circuit according to a capacitor control signal to perform band-select tuning of the VCO. The gain compensator compensates for the variable VCO gain by generating a charge pump reference current that is based on the same capacitor control signal that controls the fixed capacitors in the LC circuit. The gain compensator generates the charge pump reference current by replicating a reference scale current using unit current sources. The number of times the reference scale current is replicated is based on the fixed capacitance that is switched-in to the LC circuit and therefore the frequency band of the PLL. The reference scale current is generated based on a PLL control that specifics certain PLL characteristics such as reference frequency, loop bandwidth, and loop damping. Therefore, the reference pump current can be efficiently optimized for changing PLL operating conditions, in addition to compensating for variable VCO gain.
    • 增益补偿器补偿锁相环(PLL)中变容二极管调谐电压调谐振荡器(VCO)的增益变化。 VCO(222)包括具有多个固定电容器的并联LC电路(228),该固定电容器可以根据电容器控制信号切换或切换出LC电路,以执行VCO的频带选择调谐。 增益补偿器通过产生基于控制LC电路中的固定电容器的相同电容器控制信号的电荷泵参考电流来补偿可变VCO增益。 增益补偿器通过使用单位电流源复制参考刻度电流来产生电荷泵参考电流。 参考比例电流复制的次数是基于切换到LC电路的固定电容,因此是PLL的频带。 参考比例电流是基于特定某些PLL特性(如参考频率,环路带宽和环路阻尼)的PLL控制产生的。 因此,除了补偿可变VCO增益之外,参考泵电流可以有效地优化用于改变PLL工作条件。