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1. 发明授权

US06452445B1 Voltage controlled variable gain element 有权
标题翻译：电压可变增益元件
公开(公告)号：US06452445B1
公开(公告)日：2002-09-17
申请号：US09594988
申请日：2000-06-15
申请人： Dan Nobbe , Arul M. Balasubramaniyan
发明人： Dan Nobbe , Arul M. Balasubramaniyan
IPC分类号： G06G726
CPC分类号： H03G1/0023
摘要： A variable gain element for adjusting a magnitude of an input signal. The variable gain element includes a first differential transistor pair having a first transistor coupled to a second transistor. A second differential transistor pair couples the second transistor to a supply voltage and to an output terminal of the first transistor. A load resistor couples the output terminal to the supply voltage. A control voltage applied to an input of the second differential pair causes a varying amount of current cancellation through the load resistor.
摘要翻译：用于调整输入信号幅度的可变增益元件。可变增益元件包括具有耦合到第二晶体管的第一晶体管的第一差分晶体管对。第二差分晶体管对将第二晶体管耦合到电源电压和第一晶体管的输出端。负载电阻将输出端子耦合到电源电压。施加到第二差分对的输入端的控制电压通过负载电阻引起电流消除的变化量。

2. 发明授权

US06674333B1 Band switchable voltage controlled oscillator with substantially constant tuning range 有权
标题翻译：带可切换压控振荡器，其调谐范围基本恒定
公开(公告)号：US06674333B1
公开(公告)日：2004-01-06
申请号：US10271828
申请日：2002-10-15
申请人： David S. Peckham , Arul M. Balasubramaniyan
发明人： David S. Peckham , Arul M. Balasubramaniyan
IPC分类号： H03B500
CPC分类号： H03J5/244 , H03B2201/0208 , H03B2201/0275
摘要： Systems and methods are described for a band switchable voltage controlled oscillator. A method comprises: operating said voltage controlled oscillator in a first frequency band by switching a first capacitive circuit having a capacitance that varies with a tuning voltage; and operating said voltage controlled oscillator in a second frequency band by switching a second capacitive circuit having a capacitance that does not vary with the tuning voltage. An apparatus comprises: a switchable variable capacitance circuit; a switchable fixed capacitance circuit coupled to the switchable variable capacitance circuit; a controller for selectively switching said switchable fixed and variable capacitance circuits; a fixed tank capacitance circuit coupled to the switchable fixed capacitance circuit; a main tuning voltage variable capacitance circuit coupled to the fixed tank capacitance circuit; a tank inductance coupled to the main tuning voltage variable capacitance circuit; and an amplifier circuit coupled to the tank inductance.
摘要翻译：对带式可切换压控振荡器描述了系统和方法。一种方法包括：通过切换具有随调谐电压而变化的电容的第一电容电路来操作第一频带中的所述压控振荡器; 以及通过切换具有不随所述调谐电压而变化的电容的第二电容电路，在所述第二频带中操作所述压控振荡器。一种装置包括：可切换可变电容电路; 耦合到所述可切换可变电容电路的可切换固定电容电路; 用于选择性地切换所述可切换固定和可变电容电路的控制器; 耦合到可切换固定电容电路的固定电容电容电路; 主调谐电压可变电容电路耦合到固定槽电容电路; 耦合到主调谐电压可变电容电路的谐振电感; 以及耦合到箱体电感的放大器电路。

3. 发明授权

US07345550B2 Type II phase locked loop using dual path and dual varactors to reduce loop filter components 有权
标题翻译： II型锁相环使用双路径和双变容二极管来减少环路滤波器组件
公开(公告)号：US07345550B2
公开(公告)日：2008-03-18
申请号：US11293162
申请日：2005-12-05
申请人： Abdellatif Bellaouar , Ahmed R. Fridi , Arul M. Balasubramaniyan
发明人： Abdellatif Bellaouar , Ahmed R. Fridi , Arul M. Balasubramaniyan
IPC分类号： H03L7/00
CPC分类号： H03L7/0893 , H03L7/099 , H03L2207/06
摘要： A phase locked loop (PLL) with reduced loop filter components having dual charge pumps and corresponding dual signal paths that reduce on-chip component size within the filters. The dual paths are combined advantageously via dual varactors within a voltage controlled oscillator to further reduce loop filter components. The PLL removes the drawbacks of noise introduced by circuitry normally used for summing dual path configurations.
摘要翻译：具有减少的环路滤波器组件的锁相环（PLL），具有双电荷泵和相应的双信号路径，其减少滤波器内的片上组件尺寸。双路径有利地通过压控振荡器内的双变容二极管组合以进一步减少环路滤波器部件。 PLL消除了通常用于求和双路径配置的电路引入的噪声的缺点。

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