公开(公告)号：US20050134385A1

公开(公告)日：2005-06-23

申请号：US10928713

申请日：2004-08-26

申请人： Damian Costa ,  Joseph Austin ,  John Groe ,  Michael Farias

发明人： Damian Costa ,  Joseph Austin ,  John Groe ,  Michael Farias

IPC分类号： H03F1/22 ,  H03G1/00 ,  H03G3/30

CPC分类号： H03G1/0023 ,  H03F1/22 ,  H03F2200/294 ,  H03F2200/372

摘要： Continuous variable-gain low-noise amplifier. The amplifier continuously adjusts its gain between well-defined high and low values by using a cascode current-steering circuit to partition signal current between two different nodes of an output loading network. A shunt feedback network connected from an intermediate node of the loading network to the input provides negative feedback that linearizes the amplifier as its gain is decreased. The circuit degrades the noise figure at lower gains by varying the gain without directly dumping the signal current to the power supply. The circuit produces only small changes in input and output impedances and preserves an improved reverse-isolation cascode characteristic as the gain is controlled.

摘要翻译： 连续可变增益低噪声放大器。 放大器通过使用共源共栅电流转向电路在输出负载网络的两个不同节点之间分配信号电流，在明确的高电平和低电平值之间不断调整其增益。 从负载网络的中间节点连接到输入端的并联反馈网络提供负反馈，使得放大器随着其增益减小而线性化。 该电路通过改变增益而在较低增益下降低噪声系数，而不会将信号电流直接转储到电源。 该电路仅在输入和输出阻抗上产生小的变化，并且在增益受到控制时保持改进的反向隔离共源共栅特性。

公开(公告)号：US06801089B2

公开(公告)日：2004-10-05

申请号：US10139141

申请日：2002-05-03

申请人： Damian Costa ,  Joseph Austin ,  John Groe ,  Michael Farias

发明人： Damian Costa ,  Joseph Austin ,  John Groe ,  Michael Farias

IPC分类号： H03G310

CPC分类号： H03G1/0023 ,  H03F1/22 ,  H03F2200/294 ,  H03F2200/372

摘要： Continuous variable-gain low-noise amplifier. The amplifier continuously adjusts its gain between well-defined high and low values by using a cascode current-steering circuit to partition signal current between two different nodes of an output loading network. A shunt feedback network connected from an intermediate node of the loading network to the input provides negative feedback that linearizes the amplifier as its gain is decreased. The circuit degrades the noise figure at lower gains considerably less than conventional circuits by varying the gain without directly dumping the signal current to the power supply. The circuit produces only small changes in input and output impedances and preserves an improved reverse-isolation cascode characteristic as the gain is controlled.

摘要翻译： 连续可变增益低噪声放大器。 放大器通过使用共源共栅电流转向电路在输出负载网络的两个不同节点之间分配信号电流，在明确的高电平和低电平值之间不断调整其增益。 从负载网络的中间节点连接到输入端的并联反馈网络提供负反馈，使得放大器随着其增益的减小而线性化。 该电路通过改变增益而以比常规电路低得多的噪声系数降低噪声，而不会将信号电流直接转储到电源。 该电路仅在输入和输出阻抗上产生小的变化，并且在增益受到控制时保持改进的反向隔离共源共栅特性。

公开(公告)号：US07489916B1

公开(公告)日：2009-02-10

申请号：US10454761

申请日：2003-06-04

申请人： Michael Farias ,  John Groe ,  Damian Costa

发明人： Michael Farias ,  John Groe ,  Damian Costa

IPC分类号： H04B1/26 ,  H04B15/00

CPC分类号： H04B1/30 ,  H03D7/145 ,  H03D7/1458 ,  H03D7/1491 ,  H03D7/165 ,  H03D2200/0025 ,  H03D2200/0043 ,  H03D2200/0047

摘要： Direct down-conversion mixer. A direct down-conversion mixer is provided. The mixer comprises an LO switching pair coupled to receive an RF input signal and produce a down converted output signal. The mixer also comprises an integrator coupled to receive the output signal and produce an integrator output signal. The mixer also comprises a control circuit coupled to receive an input voltage and the integrator output signal to produce a control signal that is coupled to the LO switching pair.

摘要翻译： 直接下变频混频器 提供直接下变频混频器。 混频器包括耦合以接收RF输入信号并产生下变频输出信号的LO开关对。 混频器还包括被耦合以接收输出信号并产生积分器输出信号的积分器。 混频器还包括耦合以接收输入电压的控制电路和积分器输出信号，以产生耦合到LO开关对的控制信号。

公开(公告)号：US07164318B2

公开(公告)日：2007-01-16

申请号：US10928713

申请日：2004-08-26

申请人： Damian Costa ,  Joseph Austin ,  John Groe ,  Michael Farias

发明人： Damian Costa ,  Joseph Austin ,  John Groe ,  Michael Farias

IPC分类号： H03G3/30

CPC分类号： H03G1/0023 ,  H03F1/22 ,  H03F2200/294 ,  H03F2200/372

摘要： Continuous variable-gain low-noise amplifier. The amplifier continuously adjusts its gain between well-defined high and low values by using a cascode current-steering circuit to partition signal current between two different nodes of an output loading network. A shunt feedback network connected from an intermediate node of the loading network to the input provides negative feedback that linearizes the amplifier as its gain is decreased. The circuit degrades the noise figure at lower gains by varying the gain without directly dumping the signal current to the power supply. The circuit produces only small changes in input and output impedances and preserves an improved reverse-isolation cascode characteristic as the gain is controlled.

摘要翻译： 连续可变增益低噪声放大器。 放大器通过使用共源共栅电流转向电路在输出负载网络的两个不同节点之间分配信号电流，在明确的高电平和低电平值之间不断调整其增益。 从负载网络的中间节点连接到输入端的并联反馈网络提供负反馈，使得放大器随着其增益减小而线性化。 该电路通过改变增益而在较低增益下降低噪声系数，而不会将信号电流直接转储到电源。 该电路仅在输入和输出阻抗上产生小的变化，并且在增益受到控制时保持改进的反向隔离共源共栅特性。

公开(公告)号：US07496338B1

公开(公告)日：2009-02-24

申请号：US11027710

申请日：2004-12-29

申请人： John Groe ,  Naone Farias ,  Damian Costa ,  Babak Nejati

发明人： John Groe ,  Naone Farias ,  Damian Costa ,  Babak Nejati

IPC分类号： H04B1/06 ,  H03G5/16 ,  H03F3/45

CPC分类号： H03G3/3078 ,  H03G3/3068

摘要： Multi-segment gain control system. Apparatus is provided for a multi-segment gain control. The apparatus includes logic to convert a gain control signal to an exponential signal, and logic to map the exponential signal to multiple control signals that are used to control multiple gain stages to produce linear multi-segment gain control.

摘要翻译： 多段增益控制系统 提供了用于多段增益控制的装置。 该装置包括将增益控制信号转换为指数信号的逻辑，以及将指数信号映射到用于控制多个增益级以产生线性多段增益控制的多个控制信号的逻辑。

公开(公告)号：US06084471A

公开(公告)日：2000-07-04

申请号：US995058

申请日：1997-12-19

申请人： Robert N. Ruth, Jr. ,  John Groe ,  Damian Costa ,  Roy Enright

发明人： Robert N. Ruth, Jr. ,  John Groe ,  Damian Costa ,  Roy Enright

IPC分类号： H03G1/00 ,  H03G3/30 ,  H03G7/06 ,  H03F3/45

CPC分类号： H03G1/0023 ,  H03G3/3036 ,  H03G7/06

摘要： The input AGC and reference (REF) voltages are converted to currents and provided as differential inputs to a current amplifier. The current amplifier scales these currents proportional to absolute temperature. The translinear principle is used to realize the current amplifier and ensures linearity of the differential output currents. These currents are then converted to voltages by resistor elements. The result is applied to a simple differential pair that produces two AGC control currents that follow the hyperbolic tangent function. The two AGC control currents are equal when the AGC input is three-fourths the reference value. The overall gain response is well modeled by a second order function and is self-limiting at high gain values.

摘要翻译： 输入AGC和参考（REF）电压转换为电流，并作为差分输入提供给电流放大器。 电流放大器将这些电流与绝对温度成正比。 该线性原理用于实现电流放大器，并确保差分输出电流的线性度。 然后这些电流通过电阻元件转换成电压。 结果应用于产生跟随双曲正切函数的两个AGC控制电流的简单差分对。 当AGC输入是参考值的四分之三时，两个AGC控制电流相等。 总增益响应由二阶函数良好地建模，并且在高增益值下是自限制的。

公开(公告)号：US20070291889A1

公开(公告)日：2007-12-20

申请号：US11749538

申请日：2007-05-16

申请人： John Groe ,  Joe Austin ,  Damian Costa

发明人： John Groe ,  Joe Austin ,  Damian Costa

IPC分类号： H03D3/24

CPC分类号： H03C3/0925 ,  H03B5/1215 ,  H03B5/1228 ,  H03B5/1243 ,  H03B5/1253 ,  H03C3/0933 ,  H03C3/0958

摘要： Systems for multi-mode phase modulation are disclosed. Systems provide for direct modulation of a multi-mode voltage controlled oscillator (VCO). A fractional-N counter may be used in a phase-locked loop (PLL) to synthesize a radio frequency carrier signal. The multi-mode VCO may be characterized by a first frequency gain during operation in a first mode and by a second frequency gain during operation in a second mode where signals controlling the first and second operating modes are provided by a control circuit. The control circuit may include a switch to provide control signals to the VCO.

摘要翻译： 公开了用于多模相位调制的系统。 系统提供对多模式压控振荡器（VCO）的直接调制。 在锁相环（PLL）中可以使用分数N计数器来合成射频载波信号。 多模式VCO可以在第一模式下操作期间的第一频率增益和在控制第一和第二操作模式的信号由控制电路提供的第二模式中的第二频率增益来表征。 控制电路可以包括向VCO提供控制信号的开关。

公开(公告)号：US07135929B1

公开(公告)日：2006-11-14

申请号：US10828826

申请日：2004-04-21

申请人： Damian Costa ,  Shahram Mahdavi ,  John Groe

发明人： Damian Costa ,  Shahram Mahdavi ,  John Groe

IPC分类号： H03F3/04

CPC分类号： H03F1/22 ,  H03F1/30 ,  H03F3/19

摘要： A bias voltage circuit with ultra low output impedance. The circuit incorporates feedback to reduce the output impedance at both low and RF frequencies. The bias circuit outputs a bias signal for biasing an amplifier. The bias circuit includes an input stage that receives an input signal and produces the bias signal at an output terminal that is coupled to a gain stage. The bias circuit also includes a load coupled to the input stage at a first terminal, and a feedback circuit coupled between the first terminal and the gain stage.

摘要翻译： 具有超低输出阻抗的偏置电压电路。 该电路采用反馈来降低低频和RF频率下的输出阻抗。 偏置电路输出用于偏置放大器的偏置信号。 偏置电路包括输入级，其接收输入信号并在耦合到增益级的输出端产生偏置信号。 偏置电路还包括耦合到第一端子处的输入级的负载以及耦合在第一端子和增益级之间的反馈电路。

公开(公告)号：US06724235B2

公开(公告)日：2004-04-20

申请号：US10202502

申请日：2002-07-23

申请人： Damian Costa ,  John B. Groe ,  Michael Farias

发明人： Damian Costa ,  John B. Groe ,  Michael Farias

IPC分类号： H03K1714

CPC分类号： H03G1/0023 ,  H03F3/45085 ,  H03F3/45188 ,  H03F3/45672 ,  H03F2203/45702

摘要： A variable-gain BiCMOS transconductance amplifier (VGA). An NMOS differential pair amplifier with bipolar cascoding provides continuous gain control by adjustment of drain-source voltage to shift the NMOS differential pair from a saturation region operation and high gain to a triode operation and low gain. A simple control circuit is used in order to generate the desired exponential gain to linear control voltage characteristic that is stable over temperature and process. The shift from saturation to triode operation of the input NMOS differential pair simultaneously increases the input linearity as the gain is reduced.

摘要翻译： 可变增益BiCMOS跨导放大器（VGA）。 具有双极级级联的NMOS差分对放大器通过调整漏极 - 源极电压来提供连续增益控制，以将NMOS差分对从饱和区域操作和高增益移动到三极管操作和低增益。 使用简单的控制电路，以便产生对温度和过程稳定的线性控制电压特性所需的指数增益。 输入NMOS差分对的饱和至三极管工作的转变同时增加输入线性度，随着增益的减小。

公开(公告)号：US20080160946A1

公开(公告)日：2008-07-03

申请号：US11617054

申请日：2006-12-28

申请人： Jianhua Lu ,  Mark Santini ,  Weinan Gao ,  Mats Lindstrom ,  Damian Costa

发明人： Jianhua Lu ,  Mark Santini ,  Weinan Gao ,  Mats Lindstrom ,  Damian Costa

IPC分类号： H04B1/10 ,  H04B7/00

CPC分类号： H04B1/109 ,  H04B1/28

摘要： Systems for suppressing image noise are provided. In this regard, one embodiment includes a system for suppressing image noise comprising a low noise amplifier (LNA) configured to amplify a received RF signal, an RF variable gain attenuator with an image rejection filter with programmable bandwidth configured to suppress image noise and image interference, and an RF mixer configured to perform frequency translation.

摘要翻译： 提供用于抑制图像噪声的系统。 在这方面，一个实施例包括用于抑制图像噪声的系统，包括被配置为放大接收的RF信号的低噪声放大器（LNA），具有被配置为抑制图像噪声和图像干扰的具有可编程带宽的镜像抑制滤波器的RF可变增益衰减器 以及被配置为执行频率转换的RF混合器。