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公开(公告)号：US07092538B2
公开(公告)日：2006-08-15
申请号：US10412460
申请日：2003-04-11
申请人： Robert C. Potter , Steven E. Boor
发明人： Robert C. Potter , Steven E. Boor
IPC分类号： H04R3/00
摘要： A method and apparatus for substantially reducing and virtually eliminating direct current flow through the input transistor(s) of an input buffer circuit for an electret microphone is disclosed. An input transistor is provided and operably connected to an input and an output of the input buffer circuit. The input transistor has a first operating state wherein current flow occurs in a first direction and a second operating state wherein the a current flow occurs in a second direction—opposite that of the first direction. The input transistor is biased to alternately control operation between the first operating state and the second operating state. The alternating, opposing flows of current of the respective operating states cooperate to substantially reduce and virtually eliminate the flow of direct current through the input transistor(s) of the buffer circuit. A reduction in excess noise associated with the input transistor results from the substantially decreased direct current flow through the input transistor(s) of the buffer circuit.
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公开(公告)号：US07403756B1
公开(公告)日：2008-07-22
申请号：US11603392
申请日：2006-11-22
CPC分类号： H04B1/0096 , H04B1/0007 , H04B1/18 , H04B1/30
摘要： The present invention is directed to a highly-integrated MEMS-based miniaturized transceiver. The transceiver utilizes a low band front-end to direct sample low band signals and a high band front-end to translate high band signals that cannot be directly sampled to low band before low band front-end processing. The low band front-end comprises an array of High-Q MEMS (microelectromechanical systems)-based filters/resonators separated by isolation amplifiers in selectable cascade with narrower bandwidth filters. Dynamic tuning ability is provided through the isolation amplifiers and the sample frequency of the analog-to-digital converter. This architecture is amenable to monolithic fabrication. The input frequency range is scalable with analog-to-digital conversion sampling rate improvements. Re-utilization of filters is spatially efficient and cost effective. Tuning time is limited only by the analog-to-digital conversion and digital signal processing, not synthesizer settling times. This architecture eliminates major sources of traditional intermodulation distortion and reduces complex hardware, increasing reliability.
摘要翻译： 本发明涉及一种高度集成的基于MEMS的小型化收发器。 收发器利用低频前端来引导采样低频带信号和高频带前端，以便在低频带前端处理之前，将不能直接采样到低频段的高频带信号进行转换。 低频带前端包括由具有窄带宽滤波器的可选级联的隔离放大器隔开的高Q MEMS（微机电系统）基滤波器/谐振器阵列。 通过隔离放大器和模数转换器的采样频率提供动态调谐能力。 这种架构适合于单片制造。 输入频率范围可以通过模数转换采样率提升来扩展。 过滤器的再利用在空间上是有效的并且具有成本效益。 调谐时间仅限于模数转换和数字信号处理，而不是合成器建立时间。 该架构消除了传统互调失真的主要来源，并降低了复杂的硬件，提高了可靠性。
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3.发明授权Low phase noise MEMS-based oscillator with bifurcation and parametric noise squeezing 有权具有分岔和参数噪声挤压的低相位噪声基于MEMS的振荡器公开(公告)号：US08466754B1
公开(公告)日：2013-06-18
申请号：US13152685
申请日：2011-06-03
申请人： Vadim Olen , Jonathan A. Lovseth , Robert C. Potter , Robert A. Newgard , Roy H. Olsson, III , Kenneth E. Wojciechowski
发明人： Vadim Olen , Jonathan A. Lovseth , Robert C. Potter , Robert A. Newgard , Roy H. Olsson, III , Kenneth E. Wojciechowski
IPC分类号： H03B5/30
CPC分类号： H03B5/30 , H03B2200/009
摘要： The present invention is a method for reducing phase noise in oscillator signals. For example, the oscillator may be a low phase noise MEMS-based oscillator and may include a resonator (ex.—a MEMS resonator). Further, the resonator of the oscillator may be operated near a bifurcation point. Still further, the MEMS resonator may be parametrically pumped in such a way so as to redistribute the quadrature signal noise (ex.—phase noise) to in-phase noise (ex.—amplitude noise).
摘要翻译： 本发明是一种降低振荡器信号相位噪声的方法。 例如，振荡器可以是低相位噪声的基于MEMS的振荡器，并且可以包括谐振器（例如MEMS谐振器）。 此外，振荡器的谐振器可以在分叉点附近操作。 此外，MEMS谐振器可以以这样的方式被参数泵浦，以便将正交信号噪声（例如相位噪声）重新分配到同相噪声（例如振幅噪声）。
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