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    Electronic circuit suitable for use as frequency selective amplifier or oscillator
    1.
    发明授权
    Electronic circuit suitable for use as frequency selective amplifier or oscillator 失效
    适用于频率选择放大器或振荡器的电子电路

    公开(公告)号：US3667067A

    公开(公告)日：1972-05-30

    申请号：US3667067D

    申请日：1971-03-18

    Applicant: DEREK ALFRED LEVELL

    Inventor： LEVELL DEREK ALFRED

    IPC: H03B1/00 ,  H03B5/24 ,  H03F1/44 ,  H03F3/191 ,  H03B5/20

    CPC classification number: H03B5/24 ,  H03B2201/01 ,  H03F3/191

    Abstract: An electronic circuit has two similar phase shift networks connected in cascade between a circuit input and the input of an amplifier providing a 180* phase-shift between its input and output. The output of the amplifier and first network are combined and the combination applied to the circuit output, providing an overall frequency response exhibiting a resonant frequency. The networks may be connected together via a buffer amplifier, and each comprises a resistance and a reactance interconnected to provide a phase lead or lag. The resonant frequency may be varied by varying the gain of the amplifier or the resistance or reactance of one or both networks. Variable gain feedback circuitry may be connected between the circuit output and input, so that the circuit is selectively operable as a frequency selective amplifier or oscillator in accordance with the gain of this circuitry.

    Abstract translation: 电子电路具有两个类似的相移网络，其级联连接在电路输入端和放大器的输入端之间，其输入和输出之间提供180°的相移。 放大器和第一网络的输出被组合，并且将该组合应用于电路输出，提供呈现谐振频率的总体频率响应。 网络可以经由缓冲放大器连接在一起，并且每个都包括互连的电阻和电抗以提供相位超前或滞后。 可以通过改变放大器的增益或一个或两个网络的电阻或电抗来改变谐振频率。 可变增益反馈电路可以连接在电路输出和输入之间，使得电路根据该电路的增益选择性地用作频率选择放大器或振荡器。

    Variable frequency R.C.oscillator.
    4.
    发明公开
    Variable frequency R.C.oscillator. 失效
    RC-Oszillatorfür变量Frequenzen。

    公开(公告)号：EP0174710A1

    公开(公告)日：1986-03-19

    申请号：EP85303243.1

    申请日：1985-05-08

    Applicant: Cambridge Electronic Industries plc

    Inventor： Eberhardt, Russell John

    IPC: H03B5/20

    CPC classification number: H03B5/20 ,  H03B2200/0092 ,  H03B2201/01 ,  H03B2201/011

    Abstract: An audio signal generator incorporating a variable R.C. oscillator (10) wherein the basic timing capacitance is replaced by a capacitance multiplying circuit (12) in which a potentiometer is employed to impart frequency variations, the slider of this potentiometer being connected to one input of an operational amplifier.
    The circuit has the advantage that a linear control scale is obtainable on which the frequency is independent of the absolute value of the control device.

    Abstract translation: 一个包含变量R.C.的音频信号发生器 振荡器（10），其中基本定时电容由其中使用电位计来施加频率变化的电容乘法电路（12）代替，该电位计的滑块连接到运算放大器的一个输入端。 该电路的优点在于可获得频率与控制装置的绝对值无关的线性控制标尺。

    NOTCH FILTER CALIBRATION IN LC OSCILLATORS FOR SUPPLY NOISE REJECTION
    5.
    发明公开
    NOTCH FILTER CALIBRATION IN LC OSCILLATORS FOR SUPPLY NOISE REJECTION 审中-公开

    公开(公告)号：US20230155549A1

    公开(公告)日：2023-05-18

    申请号：US17528907

    申请日：2021-11-17

    Applicant: Intel Corporation

    Inventor： Noam Familia ,  Vadim Levin

    IPC: H03B5/24 ,  H03H7/01

    CPC classification number: H03B5/24 ,  H03H7/01 ,  H03H2007/013 ,  H03B2201/01

    Abstract: Embodiments herein relate to an apparatus and method for calibrating a notch filter which filters a power supply signal for a voltage-controlled oscillator (VCO). In one aspect, a control circuit performs a number of calibration cycles for the filter to determine a value of a calibration code for the filter which minimizes a change in a frequency of the output signal of the VCO due to a change in the voltage of the power supply signal. After each calibration cycle, the calibration code is adjusted based on whether the frequency of the output signal increase or decreases. The calibration cycles can therefore converge on an optimal calibration code which minimizes the change in frequency due to the change in voltage. This minimizes a sensitivity of the VCO to noise in the power supply signal.

    Oscillator fine tune circuit
    6.
    发明授权
    Oscillator fine tune circuit 失效
    振荡器微调电路

    公开(公告)号：US4560957A

    公开(公告)日：1985-12-24

    申请号：US537310

    申请日：1983-09-29

    Applicant: Richard C. Cabot

    Inventor： Richard C. Cabot

    IPC: H03B1/00 ,  H03B5/20 ,  H03B27/00 ,  H03B5/24 ,  H03F1/34

    CPC classification number: H03B5/20 ,  H03B2200/0078 ,  H03B2201/01 ,  H03B2201/02 ,  H03B27/00

    Abstract: An oscillator having a circuit for fine tuning the frequency thereof while minimizing any effect on the output amplitude thereof. A state variable oscillator employs an inverter amplifier having a negative feedback resistor R.sub.f, a first integrator, and a second integrator. 180.degree. feedback from the second integrator is fed back through resistors R.sub.i and R.sub.v to an inverting input of the inverter amplifier. 90.degree. feedback from the first integrator is fed back partially through resistors R.sub.n and R.sub.v and partially through resistor R.sub.m to the inverting input, and also through resistor R.sub.c to the non-inverting input. A field effect transistor provides a common return to the non-inverting input to control oscillator amplitude. If R.sub.i R.sub.m =R.sub.n R.sub.f then R.sub.v may be adjusted to vary the frequency of the oscillator output signal without affecting its amplitude.

    Abstract translation: 一种振荡器，具有用于微调其频率的电路，同时最小化对其输出幅度的任何影响。 状态可变振荡器采用具有负反馈电阻器Rf，第一积分器和第二积分器的反相放大器。 来自第二积分器的180°反馈通过电阻器Ri和Rv反馈到反相放大器的反相输入端。 来自第一积分器的90°反馈部分地通过电阻器Rn和Rv反馈并且部分地通过电阻器Rm反馈到反相输入端，并且还通过电阻器Rc反馈到非反相输入端。 场效应晶体管为非反相输入端提供一个共同的返回值，以控制振荡器幅度。 如果RiRm = RnRf，则可以调整Rv以改变振荡器输出信号的频率而不影响其振幅。

    R. c. oscillator
    7.
    发明授权
    R. c. oscillator 失效
    R.C。振荡器

    公开(公告)号：US3806832A

    公开(公告)日：1974-04-23

    申请号：US31747472

    申请日：1972-12-21

    Applicant: GTE AUTOMATIC ELECTRIC LAB INC

    Inventor： CHANNING D ,  ESTERS B

    IPC: H03B1/00 ,  H03B5/20 ,  H03B25/00

    CPC classification number: H03B5/20 ,  H03B25/00 ,  H03B2201/01

    Abstract: An improved R.C. oscillator comprises an operational amplifier which is provided with a controlled positive feedback network such that it will oscillate at a frequency determined by a frequency dependent impedance circuit. Two such oscillators may be combined to form a two-out-of-eight frequency oscillator for a telephone touch calling unit.

    Abstract translation: 改进的R.C. 振荡器包括运算放大器，该运算放大器设置有受控正反馈网络，使得其将以由频率相关阻抗电路确定的频率振荡。 两个这样的振荡器可以组合以形成用于电话触摸呼叫单元的八分之二的频率振荡器。

    Incrementally adjustable capacitor unit for tuning a crystal-controlled oscillator
    9.
    发明授权
    Incrementally adjustable capacitor unit for tuning a crystal-controlled oscillator 失效
    用于调谐晶体振荡器的可调节电容器单元

    公开(公告)号：US3754152A

    公开(公告)日：1973-08-21

    申请号：US3754152D

    申请日：1971-11-03

    Applicant: BULOVA WATCH CO INC

    Inventor： KOEHLER D ,  MUTTER W

    IPC: G04G3/00 ,  G04F5/06 ,  H03B1/00 ,  H03B5/32 ,  H03K3/283 ,  H01V7/00

    CPC classification number: H03K3/283 ,  G04F5/066 ,  H03B2201/01 ,  H03J2200/10

    Abstract: A capacitor unit adapted to adjust the frequency of a crystalcontrolled oscillator in incremental steps, the oscillator serving as a frequency standard for an electronic timepiece. The unit is constituted by a bank of capacitors whose respective values fall into a binary series, each capacitor being associated with a switch arranged to connect the capacitor in parallel relation to the other capacitors in the bank, whereby the reactance presented by the unit may be varied incrementally by selective operation of the switches to create a reactance range whose lowest value is determined by the smallest capacitor alone, whose highest value is determined by the sum of all the capacitors in the bank, and whose intermediate values are determined by the capacitors singly or in shunt combinations thereof.

    Abstract translation: 一种电容器单元，适于以增量步长调整晶体振荡器的频率，该振荡器用作电子钟表的频率标准。 该单元由一组电容器构成，其各自的值分为二进制序列，每个电容器与被布置为将电容器与该组中的其它电容器并联连接的开关相关联，由此该单元所呈现的电抗可以是 通过开关的选择性操作逐渐变化以产生电抗范围，其最小值由最小电容器单独确定，其最大值由该组中的所有电容器的总和确定，并且其中间值由电容器单独确定 或其分流组合。

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