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    • 1. 发明公开
    • Frequency modulator
    • Frequenzmodulator。
    • EP0409277A2
    • 1991-01-23
    • EP90113978.2
    • 1990-07-20
    • SANYO ELECTRIC CO., LTD.
    • Miura, Katsunori
    • H03C3/06H03L7/02H03C3/09
    • H03C3/095H03C3/06H03C2200/005H03L7/02
    • A frequency modulator is formed in a monolithic integrated circuit as a whole. A direct current signal from a center frequency control circuit and an alternating current signal from a voltage controlled amplifier (VCA) which receives a modulation signal and outputs the alternating current signal are applied to a control input of a voltage controlled oscillator (VCO). A center frequency (Fo) of the VCO is determined by the direct current signal from the center frequency control circuit and a frequency deviation amount (Δ f) of the VCO is determined by the alternating current signal from the VCA, and therefore, a frequency-modulated signal of Fo + Δ f can be outputted from the VCO. The direct current signal from the center frequency control circuit is also applied to a control input of the VCA, and therefore, the center frequency of the VCO as well as an amplitude of the alternating current signal, that is, the frequency deviation amount can be controlled by only the direct current signal.
    • 整体地,在单片集成电路中形成频率调制器。 来自中心频率控制电路的直流信号和来自接收调制信号并输出​​交流信号的压控放大器(VCA)的交流信号被施加到压控振荡器(VCO)的控制输入。 VCO的中心频率(Fo)由来自中心频率控制电路的直流信号确定,并且VCO的频率偏差量(DELTA f)由来自VCA的交流信号确定,因此频率 可以从VCO输出Fo + DELTA f的调制信号。 来自中心频率控制电路的直流信号也被施加到VCA的控制输入,因此VCO的中心频率以及交流信号的振幅,即频率偏差量可以是 仅由直流信号控制。
    • 3. 发明公开
    • A frequency synthesiser
    • Frequenzsynthesierer。
    • EP0408238A2
    • 1991-01-16
    • EP90307270.0
    • 1990-07-03
    • PLESSEY SEMICONDUCTORS LIMITED
    • Johnson, David Antony
    • H03C3/09H03L7/197H04L27/20
    • H03C3/0975H03C3/02H03C3/06H03C3/0925H03C3/0933H03C3/0941H03C3/095H03C2200/0029H03L7/197H04L27/2017
    • A frequency synthesiser comprising a phase locked loop having a reference oscillator (8) coupled to a first input of a comparator (6), a voltage controlled oscillator (VCO) (2) for providing an output signal, which output signal is fed back by way of a divider circuit (4) or dividing the output fequency by a factor N to a second input of said comparator, the output of the comparator being applied to a control input of the VCO, and including input means for applying a modulating signal in binary format via integrator means (26) for control of the divider circuit, and means having a predetermined transfer function (22) coupling said modulating signal to the control input of the VCO whereby to provide a modulation of the output signal in desired format.
    • 一种频率合成器,包括具有耦合到比较器(6)的第一输入的参考振荡器(8)的锁相环,用于提供输出信号的压控振荡器(VCO)(2),所述输出信号由 除法器电路(4)的方式或将输出倍数除以因子N到所述比较器的第二输入端,比较器的输出被施加到VCO的控制输入,并且包括用于将调制信号施加到 通过用于控制分频器电路的积分器装置(26)的二进制格式,以及具有将所述调制信号耦合到VCO的控制输入的预定传递函数(22)的装置,从而提供所需格式的输出信号的调制。
    • 4. 发明公开
    • Frequency modulator utilizing frequency synthesizer
    • Einen Synthesierer verwendender频率调制器。
    • EP0357996A1
    • 1990-03-14
    • EP89114902.3
    • 1989-08-11
    • NEC CORPORATION
    • Kojima, Tatsuru c/o NEC Corporation
    • H03C3/09
    • H03C3/095H03B5/1847H03C3/06H03C3/22H03C2200/0033H03C2200/005H03C2200/0079
    • The frequency modulator utilizing a frequency synthesizer comprises a voltage controlled oscillator (VCO-2), a programable frequency divider (4), a reference oscillator (8), a phase comparator and a phase locked loop. The VCO (2) comprises a first variable capacitor (24) receiving the control voltage from the phase comparator (6) and a second variable capacitor (26) receiving an input modulation signal. A bias circuit controls a bias to be supplied to the second variable capacitor (26) in accordance with the control voltage delivered from the phase comparator (6). An undesirable change of the modulation sensitivity due to difference of the oscillation frequency is compensated by controlling the reverse bias to be applied to the second variable capacitor (26) receiving the input modulation signal depending on the frequency control voltage for the VCO (2).
    • 利用频率合成器的频率调制器包括压控振荡器(VCO-2),可编程分频器(4),参考振荡器(8),相位比较器和锁相环。 VCO(2)包括从相位比较器(6)接收控制电压的第一可变电容器(24)和接收输入调制信号的第二可变电容器(26)。 偏置电路根据从相位比较器(6)发送的控制电压控制要提供给第二可变电容器(26)的偏置。 通过根据VCO(2)的频率控制电压控制接收输入调制信号的第二可变电容器(26)的反向偏置来补偿由于振荡频率的差异引起的调制灵敏度的不期望的改变。