公开(公告)号：EP0026639A3

公开(公告)日：1981-04-15

申请号：EP80303369

申请日：1980-09-25

Applicant: COMMUNICATIONS SATELLITE CORPORATION

Inventor： Uzunoglu, Vasil

IPC: H04L07/02 ,  H03L07/00 ,  H03B05/20

CPC classification number: H03L7/24 ,  H04L7/0083 ,  H04L7/027

Abstract: A clock recovery network comprises a synchronised voltage controlled oscillator 10 which receives the input data stream and provides at its output a clock signal synchronised with the input data stream. The tuned centre frequency of the oscillator is controlled by a coarse tuning signal in the form of a voltage proportional to the incoming symbol rate, supplied through an integrator 14 by a frequency-to-voltage converter 12 receiving the input data stream as its input. The coarse tuning signal determines the appropriate frequency range at which the oscillator 10 should operate and the oscillator is then positively synchronised to the frequency f, of the incoming data stream.

公开(公告)号：EP0034064A3

公开(公告)日：1981-12-30

申请号：EP81300523

申请日：1981-02-09

Applicant: DECCA LIMITED

Inventor： Holyman, Brian Thomas ,  Baty, Charlton Robert

IPC: H03J03/18 ,  H03J07/08 ,  H03B05/20 ,  H03H11/12

CPC classification number: H03J7/08 ,  H03B5/20 ,  H03B2200/004 ,  H03H11/12

Abstract: A notch filter (3) is provided with an ancillary circuit (12) including a non-inverting amplifier (14) and a coupling (13) which enables the filter to form part of a oscillatory loop of which the frequency of oscillation corresponds to the frequency of maximum rejection by the notch filter. Measurement of that frequency facilitates the tuning of the notch filter, which includes capacitors constituted by varactor diodes (6, 6a). The gain of the ancillary circuit may be adjusted to change its mode of operation from oscillation to that of a tuned amplifier so that a sweep of the centre frequency of the notch filter through a range of interest facilitates a search for an unknown interfering frequency and the simultaneous tuning of the notch filter to reject that interference.

公开(公告)号：WO1995034950A1

公开(公告)日：1995-12-21

申请号：PCT/JP1995001014

申请日：1995-05-26

Applicant: IKEDA, Takeshi ,  OHE, Tadataka

IPC: H03B05/20

CPC classification number: H03B5/20 ,  H03B5/24 ,  H03B2200/004 ,  H03B2200/0078 ,  H03B2201/02 ,  H03B2201/0208

Abstract: An oscillator which is easily fabricated in an integrated circuit and stably operates and the oscillatory frequency of which can be adjusted within a wide range. The oscillator is constituted of two phase shifting circuits (10C and 30C) which perform prescribed phase shifting by combining signals of the same phase and opposite phase generated at the source and drain of a FET through capacitors or resistors, a noninverting circuit (50) which amplifies the output signal of the phase shifting circuit (30C) of the second stage without changing its phase, and a feedback resistor (70) which feeds back the signal outputted from the circuit (50) to the input of the phase shifting circuit (10) of the first stage.

Abstract translation: 一种易于在集成电路中制造并稳定工作并且其振荡频率可在宽范围内调节的振荡器。 振荡器由两个移相电路（10C和30C）组成，它们通过组合通过电容器或电阻器在FET的源极和漏极产生的相同相位和相位相位的信号来执行规定的相移;同相电路（50） 放大第二级的移相电路（30C）的输出信号而不改变其相位;以及反馈电阻（70），将从电路（50）输出的信号反馈到相移电路（10 ）的第一阶段。

公开(公告)号：WO1996004709A1

公开(公告)日：1996-02-15

申请号：PCT/JP1995001525

申请日：1995-08-01

Applicant: IKEDA, Takeshi ,  OHE, Tadataka ,  NAKANISHI, Tsutomu

IPC: H03B05/20

CPC classification number: H03B5/20 ,  H03B2200/004 ,  H03B2200/0078 ,  H03B2201/02

Abstract: An oscillator which is easily formed into an integrated circuit and stably operated and the oscillation frequency of which can be adjusted within a wide range. The oscillator has two phase shifting circuits (10C and 30C) and a feedback resistor (70). The phase shifting circuits (10C and 30C) each have an operational amplifier which receives signals through a resistor at an inverting input terminal, a series circuit comprising a capacitor across both ends of which the voltage of the input signal is applied and a variable resistor, and a resistor for feeding back the output of the operational amplifier to the inverting input terminals. The output of the phase shifting circuit (10C) is connected to the input of the phase shifting circuit (30C). The feedback resistor (70) feeds back the signal outputted from the phase shifting circuit (30C) to the input side of the phase shifting circuit (10C).

Abstract translation: 一种易于形成集成电路并稳定工作并且其振荡频率可在宽范围内调节的振荡器。 振荡器具有两个移相电路（10C和30C）和反馈电阻（70）。 相移电路（10C和30C）各自具有运算放大器，其通过反相输入端子处的电阻器接收信号，串联电路包括施加输入信号的电压的两端的电容器和可变电阻器， 以及用于将运算放大器的输出反馈到反相输入端子的电阻器。 移相电路（10C）的输出端连接到移相电路（30C）的输入端。 反馈电阻（70）将从移相电路（30C）输出的信号反馈到移相电路（10C）的输入侧。

公开(公告)号：WO1995034951A1

公开(公告)日：1995-12-21

申请号：PCT/JP1995001179

申请日：1995-06-13

Applicant: IKEDA, Takeshi ,  OHE, Tadataka

IPC: H03B05/20

CPC classification number: H03B5/24

Abstract: An oscillator the oscillation of which can be adjusted over a wide range and which can stably operate and can be easily formed in an integrated circuit, comprises two phase shifting circuits (10C and 30C) each having a first serial circuit which divides the voltage of an inputted AC signal into about halves and which comprises two resistors, a second serial circuit which shifts the phase of the inputted AC signal by prescribed angle and which comprises a capacitor and a variable resistor, and a differential amplifier which performs prescribed amplification of the difference between the outputs of the first and second serial circuits, a noninverting circuit (50) connected to the input of the phase shifting circuit (10C), and a feedback resistor (70) which feeds back the signal outputted from the phase shifting circuit (30C) to the input of the noninverting circuit (50).

Abstract translation: 振荡器的振荡可以在宽范围内进行调节并且可以稳定地操作并且可以容易地在集成电路中形成，包括两个移相电路（10C和30C），每个具有第一串联电路，该第一串联电路将 输入的AC信号分成两半，并且包括两个电阻器，第二串联电路，其将输入的AC信号的相位偏移指定角度，并且包括电容器和可变电阻器;以及差分放大器，其执行规定的放大倍数 第一和第二串行电路的输出，连接到移相电路（10C）的输入端的同相电路（50）和反相电路（70）反馈从相移电路（30C）输出的信号， 到同相电路（50）的输入。

公开(公告)号：WO1994029947A1

公开(公告)日：1994-12-22

申请号：PCT/CA1994000237

申请日：1994-05-04

Applicant: NORTHERN TELECOM LIMITED

Inventor： NORTHERN TELECOM LIMITED ,  BROWN, Anthony, Kevin, Dale

IPC: H03B05/20

CPC classification number: H03H11/42 ,  H03B5/20 ,  H03G1/0023

Abstract: A gyrator based resonator comprises first and second differential amplifiers cross coupled to form a quadrature phase voltage controlled oscillator. The differential amplifier circuits include matched transistor pairs and associated transconductance adjusting components to control the resonant frequency of the resonator. Transconductance delay and admittance loss elements are also provided and these elements serve to control the loop gain of the resonator. A loop gain greater than unity results in the resonator oscillating while a loop gain less than unity produces a bandpass filter. A resonator having gain less than unity may be slaved to a similar resonator having gain adjusted to be greater than unity thus creating a low noise oscillator and tracking filter.

Abstract translation: 基于回转器的谐振器包括交叉耦合以形成正交相压控振荡器的第一和第二差分放大器。 差分放大器电路包括匹配的晶体管对和相关联的跨导调整组件以控制谐振器的谐振频率。 还提供了跨导延迟和导纳损耗元件，并且这些元件用于控制谐振器的环路增益。 大于单位的环路增益导致谐振器振荡，而环路增益小于单位产生带通滤波器。 具有小于1的增益的谐振器可以被从属于具有被调整为大于1的增益的类似谐振器，从而产生低噪声振荡器和跟踪滤波器。

公开(公告)号：WO1993019517A1

公开(公告)日：1993-09-30

申请号：PCT/CA1992000534

申请日：1992-12-09

Applicant: NORTHERN TELECOM LIMITED

Inventor： NORTHERN TELECOM LIMITED ,  BROWN, Anthony, Kevin, Dale

IPC: H03B05/20

CPC classification number: H03B27/00

Abstract: A resonant circuit comprises first (600) and second (600') amplifiers. An input of the second amplifier is coupled to an output of the first amplifier, and an output of the second amplifier is cross-coupled to an input of the first amplifier. The first amplifier has a first gain and a 90 degree phase shift between its input and its output at a resonant frequency of the resonant circuit. The second amplifier has a second gain and a 90 degree phase shift between its input and its output at the resonant frequency of the resonant circuit. The second gain is different from the first gain. The resonant circuit can have a first port (Ap, An) and second ports (Bp, Bn) coupled to an input and an output respectively of one of the first and second amplifiers. Because the gains of the first and second amplifiers differ, the gain from the first port to the second port of the resonant circuit will differ from the gain from the second port to the first port. This gain difference is useful for enhancing the quality factor Q of multiple resonator circuits constructed from such resonant circuits.