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    • 1. 发明授权
    • Low noise mixer circuit having passive inductor elements
    • 低噪声混频器电路具有无源电感元件
    • US5884154A
    • 1999-03-16
    • US672486
    • 1996-06-26
    • Jun-ichi SanoRaymond S. PengellyMiles E. Goff
    • Jun-ichi SanoRaymond S. PengellyMiles E. Goff
    • H03D7/14H03F3/45H04B1/28H04B1/16
    • H03F3/45188H03D7/1433H03D7/1441H03D7/1458H03D7/1491H03D2200/0025H03D2200/0084
    • A mixer circuit is provided which incorporates inductive elements for low voltage applications. The circuit consists of a balanced amplifier and a switch composed of transistor pairs driven by a local oscillator signal for multiplying the signal to produce a circuit output signal having a predetermined intermediate frequency. Inductors are used to provide degenerative feedback in the balanced amplifier portion of the circuit. The inductors generate negligible noise and produce a negligible dc voltage drop. The transistors in the circuit are thereby maintained in saturation regions of operation as desired. In accordance with another aspect of the invention, an inductor or, alternatively, a parallel inductor-capacitor circuit, is used as a constant current source in conjunction with the input transistors in the balanced amplifier portion of the circuit.
    • 提供了一种混合电路,其中包含用于低电压应用的电感元件。 电路由平衡放大器和由本机振荡器信号驱动的晶体管组构成的开关构成,用于对信号进行乘法,以产生具有预定中间频率的电路输出信号。 电感器用于在电路的平衡放大器部分中提供退化反馈。 电感器产生可忽略的噪声并产生可忽略的直流电压降。 因此,电路中的晶体管因此被保持在饱和的操作区域中。 根据本发明的另一方面,电感器或可替代地,并联电感器 - 电容器电路被用作与电路的平衡放大器部分中的输入晶体管一起的恒流源。
    • 2. 发明授权
    • Multi-stage wideband successive detection logarithmic amplifier
    • 多级宽带连续检测对数放大器
    • US4980584A
    • 1990-12-25
    • US258135
    • 1988-10-14
    • Miles E. GoffDavid E. Meharry
    • Miles E. GoffDavid E. Meharry
    • G06G7/24
    • G06G7/24
    • A successive detection logarithmic amplifier consists of multiple stages, with each stage containing a field-effect transistor (FET) which functions as both an amplifier and a detector. The FET, having an external gate biasing terminal, is biased to operate in its linear region as an amplifier. The gate-source junction of the FET, which is a diode, functions as the detector. When a signal exceeding a predetermined threshold is applied to the FET, the gate-source junction conducts current in the forward direction during the positive half-cycles of the input signal. During the negative half-cycles of the input signal, very little current flows through the gate-source diode junction. The time average of the forward current peaks produces a voltage across a resistor connected between the external gate bias terminal and ground. The voltages at the external gate bias terminals of each of the stages are summed to form a video output signal, a piece-wise linear voltage which is a logarithmically proportional to the input signal at the initial stage.
    • 连续的检测对数放大器由多级构成,每级包含一个场效应晶体管(FET),它既用作放大器又用作检测器。 具有外部栅极偏置端子的FET被偏置为在其线性区域中作为放大器工作。 作为二极管的FET的栅 - 源极结用作检测器。 当超过预定阈值的信号被施加到FET时,在输入信号的正半周期期间,栅 - 源结在正向传导电流。 在输入信号的负半周期期间,极少的电流流过栅极 - 源极二极管结。 正向电流峰值的时间平均值在连接在外部栅极偏置端子和地之间的电阻器两端产生电压。 每个级的外部栅极偏置端子处的电压被相加以形成视频输出信号,分段线性电压在初始阶段与输入信号成对数比例。
    • 5. 发明授权
    • Microstrip to circular waveguide transition with a stripline portion
    • US06624716B2
    • 2003-09-23
    • US10037789
    • 2002-01-03
    • Miles E. Goff
    • Miles E. Goff
    • H01P5107
    • H01P5/107
    • A microstrip to circular waveguide transition having an elongated circular waveguide portion and a stripline circuit portion disposed within the waveguide portion. The stripline includes a strip conductor disposed in a strip conductor plane. The strip conductor extends along a longitudinal axis of the circular waveguide portion from a first region of the transition to a longitudinally spaced second region of the transition. The stripline circuit portion includes a pair of overlying ground planes extending along the longitudinal axis from the first region to the second region, such pair of ground planes being disposed in overlying planes parallel to the strip conductor plane. The strip conductor is spaced from a pair of diametrically opposed first portions of the sidewalls in the first region and bends towards a first of a pair of diametrically opposed second portions of the sidewalls and away from a second one of the pair of opposed second portions of the sidewalls as such strip conductor extends within the waveguide portion towards the second region. The pair of overlying ground planes is disposed adjacent the diametrically opposed sidewall portions of the sidewalls in the first region of the transition and bend away from the first one of the pair of diametrically opposed second portions of the sidewalls and towards the second one of the diametrically opposed second portions of the sidewalls as such pair of ground planes extends within the waveguide section towards the second region. With such an arrangement, the stripline circuit portion provides two symmetrically located ground planes, which make two symmetrical E, field vectors. X-axis components of these vectors add to excite the desired mode in the circular waveguide. Y-axis components of these two vectors are in opposite directions, and will thus cancel out the contribution of coupling to the undesired orthogonal mode in the circular waveguide. This cancellation, due to symmetry, is not related to any particular wavelength, and thus the phenomenon is very broadband.
    • 8. 发明授权
    • Temperature compensated amplifier and operating method
    • 温度补偿放大器和操作方法
    • US6114910A
    • 2000-09-05
    • US211119
    • 1998-12-14
    • Miles E. Goff
    • Miles E. Goff
    • H03F1/30
    • H03F1/306H01L2924/0002
    • An amplifier having an uncompensated gain which decreases with increasing temperature. The amplifier includes an integrated circuit chip having formed thereon a plurality of serially coupled amplifier stages. Each one of a portion of such stages has temperature compensation circuitry. Such circuitry includes a plurality of selectable gains, such gain being selected in accordance with temperature of the chip. The stage has a higher gain at a temperature above a predetermined threshold level associated with such stage and a lower gain at temperature below such predetermined threshold level associated with such stage. Each one of such stages is associated with a different predetermined threshold level. Each one of the stages includes a gain stage having a switchable feedback element, such stage providing a first gain when such element is switched into one state and a second gain when such element is switched into a second state. The temperature compensation circuitry switches such element into one of the states selectively in accordance with the temperature of the chip. Each one of the stages includes a gain stage having: a feedback element; and a switch, such element being in shunt with the switch. The switch is operable to either shunt such element or un-shunt such element. The stage provides a first gain when such element is shunted by the switch and a second gain when such element is un-shunted by such switch. The temperature compensation circuitry places such switch is a condition to either shunt such element or un-shunt such element selectively in accordance with the temperature of the chip.
    • 具有随温度升高而减小的未补偿增益的放大器。 放大器包括其上形成有多个串联放大器级的集成电路芯片。 这些级的一部分中的每一个具有温度补偿电路。 这种电路包括多个可选择的增益,这种增益根据芯片的温度来选择。 阶段在高于与这种阶段相关联的预定阈值水平的温度下具有更高的增益,并且在低于与这种阶段相关联的预定阈值水平的温度下的较低增益。 这些阶段中的每一个与不同的预定阈值水平相关联。 每个级包括具有可切换反馈元件的增益级,当这种元件被切换到一种状态时,这种级提供第一增益,当这种元件被切换到第二状态时,该级提供第一增益。 温度补偿电路根据芯片的温度选择性地将这些元件切换成一个状态。 每个级包括增益级,其具有:反馈元件; 和开关,这种元件与开关分流。 开关可操作以分流这样的元件或不分流这样的元件。 当这种元件被开关分流时,该级提供第一增益,并且当这种元件不被这种开关分流时,该级提供第一增益。 温度补偿电路将这种开关置于根据芯片的温度选择性地分流这样的元件或者不选择地分流这种元件的条件。