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1.发明授权Switched capacitor oscillator formed by a damped resonator with saturable feedback 失效开关电容振荡器由具有可饱和反馈的阻尼谐振器形成
公开(公告)号：US4492935A
公开(公告)日：1985-01-08
申请号：US474685
申请日：1983-03-11
CPC分类号： H03B5/06
摘要： A switched capacitor oscillator is constructed by providing a damped resonator network with a comparator as a nonlinear feedback element by connecting the input of the comparator to the output of a first operational amplifier of the resonator network and connecting the output of the comparator to the input of the resonator network. The comparator thus becomes a saturable positive feedback element for the resonator network. Also disclosed is a startup network for the oscillator and an input network which derives an input from a reference voltage in order to eliminate supply voltage noise and provide precision control of amplitude.
摘要翻译： 通过将比较器的输入连接到谐振器网络的第一运算放大器的输出并将比较器的输出连接到比较器的输入端，将具有比较器的阻尼谐振器网络提供为非线性反馈元件构成开关电容振荡器 谐振器网络。 因此，比较器成为谐振器网络的可饱和正反馈元件。 还公开了用于振荡器的启动网络和从参考电压导出输入的输入网络，以便消除电源电压噪声并提供振幅的精确控制。
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2.发明授权Method and means for coupling a multiplicity of surface acoustic wave transducers to a single electromagnetic wave transmission line 失效用于将多个表面声波换能器耦合到单个电磁波传输线的方法和装置
公开(公告)号：US3942140A
公开(公告)日：1976-03-02
申请号：US522367
申请日：1974-11-08
申请人： Kenneth R. Laker , Alan J. Budreau , Paul H. Carr
发明人： Kenneth R. Laker , Alan J. Budreau , Paul H. Carr
CPC分类号： H03H9/72 , H03H9/0296
摘要： The input transducers of a multichannel surface acoustic wave device are electrically connected in a series or series-parallel circuit arrangement and are connected to a single channel electromagnetic wave transmission line through an inductor. The inductance value of the inductor is chosen such that minimum transducer insertion loss is achieved at the center frequency of the midband channel. The circuit arrangement is selected which achieves optimum coupling to the midband channel subject to the constraint that the insertion losses of all the remaining channels, measured at their respective center frequencies, lie at or near the above optimum value within an acceptable prespecified margin.
摘要翻译： 多通道声表面波器件的输入传感器以串联或并联电路布置电连接，并通过电感器连接到单通道电磁波传输线。 选择电感器的电感值，使得在中频带通道的中心频率处实现最小的换能器插入损耗。 选择电路布置，其实现了对中频带信道的最佳耦合，受限于所有剩余信道的插入损耗在其各自的中心频率处测量在可接受的预定边界内处于或接近上述最佳值。
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公开(公告)号：US4242642A
公开(公告)日：1980-12-30
申请号：US37299
申请日：1979-05-09
申请人： Kenneth R. Laker , Jimmy Tow
发明人： Kenneth R. Laker , Jimmy Tow
CPC分类号： H03H11/126
摘要： An enhanced pole quality factor (Q) notch filter section circuit includes an active biquadratic notch filter section and a pole quality factor enhancement amplifier responsive to the output of the biquadratic notch filter section for providing at the input of the biquadratic notch filter section negative feedback in pass and stop bands of frequencies and positive feedback in the transition range of frequencies between the pass and stop bands of frequencies.
摘要翻译： 增强的极点品质因子（Q）陷波滤波器部分电路包括有效的二次陷波滤波器部分和响应于二次陷波滤波器部分的输出的极品质因子增强放大器，用于在双向陷波滤波器部分的输入处提供负反馈 在频带的通过和停止频带之间的频率的转变范围内通过和停止频带和正反馈。
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公开(公告)号：US4005378A
公开(公告)日：1977-01-25
申请号：US635005
申请日：1975-11-25
CPC分类号： H03H9/1452 , H03H9/6489
摘要： A surface acoustic wave bandpass filter having a flat frequency response in the passband and an exponentially decaying out-of-band response is realized by designing its transducer electrodes to have an appropriate number of discretely apodized interdigital fingers. The apodization or overlap coefficients H.sub.o (N) of adjacent fingers are determined from an analytically derived expression that incorporates factors for the filter time length parameter, the filter center frequency, bandwidth, transition bandwidth falloff, and a ripple reduction parameter.
摘要翻译： 通过设计其换能器电极以具有适当数量的离散变迹的叉指指，实现通带中具有平坦频率响应和指数衰减带外响应的表面声波带通滤波器。 从分析导出的表达式确定相邻手指的变迹或重叠系数Ho（N），该表达包含滤波器时间长度参数，滤波器中心频率，带宽，转换带宽衰减和纹波衰减参数的因子。
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公开(公告)号：US4315227A
公开(公告)日：1982-02-09
申请号：US100293
申请日：1979-12-05
CPC分类号： H03H19/004 , H03F3/005
摘要： Because of the very large variety of useful filter configurations, it is highly desirable to have a generalized circuit topology from which all specific filters can be derived. A generalized switched-capacitor biquadratic active filter comprises a pair of operational amplifiers (10, 11), each of which has an unswitched feedback capacitor (D, B) connected between its output port (3, 3') and its inverting input port (1, 1'). A third through-switched capacitor (C) provides feedback between the output port (3') of the second amplifier (11) and the inverting input port (1) of the first amplifier (10). A diagonally-switched capacitor (A) couples the output port (3) of the first amplifier (10) to the inverting input port (1') of the second amplifier (11). The noninverting input ports (2, 2') of the two amplifiers are connected to signal ground. The filter input terminal (5) is connected to the inverting input ports (1, 1') of each amplifier by an input circuit including a parallel array of an unswitched capacitor, a diagonally-switched capacitor, and a through-switched capacitor (L, H, G and K, J, I). Damping is provided by either a through-switched capacitor (F) connected in parallel with feedback capacitor (B), or by a unswitched capacitor (E) connected in parallel with through switched feedback capacitor (C).
摘要翻译： 由于有用的滤波器配置的种类非常多，所以非常希望有一个广义的电路拓扑，从中可以推导出所有特定的滤波器。 广义开关电容器二元有源滤波器包括一对运算放大器（10,11），每对运算放大器具有连接在其输出端口（3,3'）和其反相输入端口（3，3'）之间的非开关反馈电容器（D，B） 1，1'）。 第三贯通开关电容器（C）在第二放大器（11）的输出端口（3'）和第一放大器（10）的反相输入端口（1）之间提供反馈。 对角线开关电容器（A）将第一放大器（10）的输出端口（3）耦合到第二放大器（11）的反相输入端口（1'）。 两个放大器的同相输入端口（2,2'）连接到信号地。 滤波器输入端子（5）通过包括未开关电容器，对角线开关电容器和贯通开关电容器（L）的并联阵列的输入电路连接到每个放大器的反相输入端口（1,1'） ，H，G和K，J，I）。 通过与反馈电容器（B）并联连接的通过开关电容器（F）或与通过开关反馈电容器（C）并联连接的未开关电容器（E）提供阻尼。
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6.发明授权
公开(公告)号：US4146808A
公开(公告)日：1979-03-27
申请号：US850325
申请日：1977-11-10
CPC分类号： H03H9/14526
摘要： Passband distortion due to mass loading in withdrawal weighted surface acoustic wave transducers is substantially reduced by a thinning technique in which interdigital transducer electrodes are selectively withdrawn to synthesize a response function H.sub.o '(N). H.sub.o '(N) is a modified response function that has been scaled from a desired response function H.sub.o (N) by a thinning factor THIN. THIN is a positive, non-zero constant with a maximum value of unity. Thinned withdrawal weighted transducers fabricated in accordance with the technique have electrode weights that are normalized to less than unity and achieve mass loading reduction with a minimum amount of degradation of the desired response function.
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公开(公告)号：US4399417A
公开(公告)日：1983-08-16
申请号：US157452
申请日：1980-06-06
CPC分类号： H03H7/0123 , H01L27/0794 , H03H1/02 , H03H11/1204
摘要： A capacitor-resistor-capacitor (CRC) element for active filter realization, which is fully integrable and compatible with MOS technology, is described. The incorporation of the CRC element in a semiconductor integrated circuit active filter also is described. The structure of the CRC filter element is closely analogous to a depletion mode MOS field effect device, except that the channel zone 26 is doped to a level which substantially precludes conductivity modulation at the usual operating voltages. However, the doping level is such as to enable the use of the channel zone as a semiconductor resistance element. Thus, the N-channel CRC element realized in the NMOS technology comprises a first capacitance composed of the gate 27, gate dielectric 38, and resistive channel 26, paralleled by the resistive channel 26 itself constituting a resistor, and then the underlying PN junction capacitance between the N-type resistive channel 26 and the underlying P-type semiconductor body portion 21. An active low-pass filter consists of two CRC elements and an operational amplifier and utilizes the positive feedback principle.
摘要翻译： 描述了用于有源滤波器实现的电容器 - 电阻 - 电容（CRC）元件，其完全可集成并且与MOS技术兼容。 还描述了将CRC元件结合到半导体集成电路有源滤波器中。 CRC滤波器元件的结构非常类似于耗尽型MOS场效应器件，不同之处在于通道区26被掺杂到基本上阻止在通常工作电压下的电导率调制的水平。 然而，掺杂水平使得能够使用沟道区作为半导体电阻元件。 因此，在NMOS技术中实现的N沟道CRC元件包括由栅极27，栅极电介质38和电阻通道26组成的第一电容，其由构成电阻器的电阻通道26本身并联，然后是下面的PN结电容 N型电阻通道26与下面的P型半导体主体部分21之间。有源低通滤波器由两个CRC元件和运算放大器组成，并利用正反馈原理。
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