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公开(公告)号：US4628272A
公开(公告)日：1986-12-09
申请号：US655822
申请日：1984-10-01
申请人： Walter L. Davis , Yolanda Prieto
发明人： Walter L. Davis , Yolanda Prieto
CPC分类号： H03D3/20 , H03D2200/0009 , H03D2200/0039 , H03D2200/0082 , H03D2200/0096
摘要： An inductorless quadrature demodulator for frequency modulated signals is disclosed. A limited FM signal is passed through an active filter (26) and a phase shift network (30) to produce a quadrature signal. The limited FM signal is compared with the quadrature signal in an EXCLUSIVE OR gate (24) and then low pass filtered (36) to obtain recovered audio. The active filter (26) includes a transconductance amplifier (60) whose center frequency can be adjusted by appropriate adjustment of the amplifier's bias current. The bias current is temperature compensated to allow operation of the demodulator over a wide temperature range.
摘要翻译： 公开了一种用于调频信号的无电感正交解调器。 有限的FM信号通过有源滤波器（26）和相移网络（30）以产生正交信号。 将有限的FM信号与异或门（24）中的正交信号进行比较，然后低通滤波（36）以获得恢复的音频。 有源滤波器（26）包括跨导放大器（60），其中心频率可以通过适当调整放大器的偏置电流来调节。 偏置电流进行温度补偿，以允许解调器在宽温度范围内工作。
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公开(公告)号：US4362998A
公开(公告)日：1982-12-07
申请号：US7981
申请日：1979-01-31
申请人： Kazuo Watanabe , Masanori Ienaka , Yasuo Kominami , Makoto Homma
发明人： Kazuo Watanabe , Masanori Ienaka , Yasuo Kominami , Makoto Homma
CPC分类号： H03D3/22 , H03D3/14 , H03D1/229 , H03D13/008 , H03D2200/0009 , H03D2200/0049
摘要： An FM detector is constructed of a phase shift network and an analog multiplier. The analog multiplier includes a differential amplifier circuit and a phase detector circuit. The differential amplifier circuit includes differential pair transistors which are driven by FM intermediate frequency signals. One of the differential pair transistors has another transistor connected thereto which is also driven by the FM intermediate frequency signal. A collector signal of either one of the differential pair transistors is applied to the phase detector circuit through the phase shift network, while a collector signal of the other transistor is directly applied to the phase detector circuit. An emitter of the one transistor and an emitter of the other transistor are connected through resistors, whereby the signal-to-noise ratio of the FM detector is improved.
摘要翻译： FM检波器由相移网络和模拟乘法器构成。 模拟乘法器包括差分放大器电路和相位检测器电路。 差分放大器电路包括由FM中频信号驱动的差分对晶体管。 差分对晶体管中的一个具有连接到其上的另一个晶体管，其也由FM中频信号驱动。 差分对晶体管中的任一个的集电极信号通过相移网络施加到相位检测器电路，而另一个晶体管的集电极信号被直接施加到相位检测器电路。 一个晶体管的发射极和另一个晶体管的发射极通过电阻连接，从而提高了FM检测器的信噪比。
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公开(公告)号：US4342000A
公开(公告)日：1982-07-27
申请号：US135149
申请日：1980-03-28
申请人： Minoru Ogita
发明人： Minoru Ogita
CPC分类号： H03D3/22 , H03D3/10 , H03D2200/0009 , H03D2200/0049 , H03D2200/0082 , H03D2200/0088
摘要： In an FM detecting circuit of either the ratio detecting circuit type or the quadrature detecting circuit type arranged to have an LC resonance circuit and to detect the amount of deviation of an FM input signal relative to the resonance frequency by utilizing the resonance characteristic of the LC resonance circuit in the vicinity of the resonance frequency to thereby perform FM detection, a semiconductor element is connected to the LC resonance circuit to expand the rectilinear region of the resonance characteristic and to reduce detecting distortions.
摘要翻译： 在布置成具有LC谐振电路的比率检测电路类型或正交检测电路类型的FM检测电路中，并且通过利用LC的谐振特性来检测FM输入信号相对于谐振频率的偏差量 在谐振频率附近的谐振电路，从而进行FM检测，半导体元件连接到LC谐振电路，以扩大谐振特性的直线区域，并减少检测失真。
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公开(公告)号：US3604946A
公开(公告)日：1971-09-14
申请号：US3604946D
申请日：1969-04-28
申请人： US NAVY
发明人： PROZELLER DEWARD F
CPC分类号： H03D13/008 , H03D2200/0009
摘要： A phase detector circuit in which the rectifying elements conduct for a fraction of the reference period and therein determine the relative phase difference between an unknown input signal and a reference signal. This is primarily accomplished by obtaining from the reference signal switching functions that are of fractional duty cycle as compared to the unknown signal. The output of this fractional duty cycle phase detector is a DC voltage whose level is proportional to the phase difference between the reference and the unknown input signal.
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公开(公告)号：US5596298A
公开(公告)日：1997-01-21
申请号：US418140
申请日：1995-04-05
CPC分类号： H03D3/22 , H03D2200/0009 , H03D2200/0019 , H03D2200/0047 , H03D2200/0052 , H03D2200/0082
摘要： In a quadrature FM detector, demodulation is performed by a product detector which multiplies an amplitude limited FM modulated information signal by a version of the amplitude limited FM modulated information signal which has been phase shifted by a phase shifting network including a single tuned LC circuit. In order to assure that the LC circuit is tuned to the carrier frequency of the FM signal, the LC circuit is tuned by a variable impedance device in response to a control signal generated by a bus controlled DAC. The control signal is coupled to the variable impedance device at the same pin of an integrated circuit where the LC circuit is coupled to the demodulator.
摘要翻译： 在正交FM检测器中，通过产品检测器进行解调，产品检测器将限幅FM调制信息信号乘以已经由包括单个调谐LC电路的相移网络相移的限幅FM调制信息信号的版本。 为了确保LC电路被调谐到FM信号的载波频率，响应于由总线控制的DAC产生的控制信号，LC电路由可变阻抗器件调谐。 控制信号耦合到集成电路的相同引脚处的可变阻抗器件，其中LC电路耦合到解调器。
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6.发明授权Phase comparator circuit and phase locked loop (PLL) circuit using the same 失效相位比较器电路和锁相环（PLL）电路使用相同
公开(公告)号：US5343097A
公开(公告)日：1994-08-30
申请号：US944415
申请日：1992-09-14
申请人： Hiroshi Takeuchi
发明人： Hiroshi Takeuchi
CPC分类号： H03D13/008 , H03K5/26 , H03D2200/0009 , H03D2200/0047 , H03D7/14
摘要： A phase comparator circuit is constituted by a quadrant multiplier circuit and a DC compensation circuit. The quadrant multiplier circuit includes transistor pairs and outputs phase differences respectively of input data signals and clock signals. The DC compensation circuit has a variable current source and two transistor pairs whose collectors are connected respectively to a positive phase output and a reverse phase output from said quadrant multiplier circuit and whose emitters are connected to said variable current source. The phase comparator circuit thus arranged is capable of increasing a pulling-in range of the circuit.
摘要翻译： 相位比较器电路由象限乘法电路和直流补偿电路构成。 象限乘法器电路包括晶体管对，分别输出输入数据信号和时钟信号的相位差。 DC补偿电路具有可变电流源和两个晶体管对，其集电极分别连接到正相输出和来自所述象限乘法器电路的反相输出，并且其发射极连接到所述可变电流源。 这样布置的相位比较器电路能够增加电路的拉入范围。
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公开(公告)号：US4283792A
公开(公告)日：1981-08-11
申请号：US25034
申请日：1979-03-29
CPC分类号： H03D3/20 , H03D1/2254 , H03J7/04 , H04N5/50 , H03D13/008 , H03D2200/0009 , H03D2200/0049 , H03D2200/0082
摘要： In a system in which an intermediate frequency signal is synchronously detected using an intermediate frequency carrier signal derived from the intermediate frequency signal by means of a tuned circuit and a limiter circuit to remove amplitude variations therefrom, an automatic fine tuning signal is derived in a phase detector to which are fed the intermediate frequency carrier signal after its phase has been shifted 90 degrees in a phase shifter and either the intermediate frequency signal or the intermediate frequency carrier signal. When the intermediate frequency carrier signal is used in the phase detector, a second tuned circuit is used therein and buffering between the two tuned circuits prevents interaction therebetween.
摘要翻译： 在使用通过调谐电路从中频信号导出的中频载波信号和限幅器电路同步检测中频信号的系统中，以消除其振幅变化，在相位中导出自动微调信号 检测器在其相位在移相器中被移位90度之后被馈送到中频载波信号，以及中频信号或中频载波信号。 当在相位检测器中使用中频载波信号时，在其中使用第二调谐电路，并且两个调谐电路之间的缓冲阻止它们之间的相互作用。
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公开(公告)号：US3970868A
公开(公告)日：1976-07-20
申请号：US590894
申请日：1975-06-27
CPC分类号： H03D13/008 , G01R25/005 , H03D2200/0009 , H03D2200/0033
摘要： A phase comparator suitable for integrated circuit fabrication is disclosed wherein each one of a pair of differential amplifiers periodically couples an input signal to the output of the comparator through a degenerative feedback arranged high gain amplifier selectively in accordance with a periodic reference signal. During one-half period of the reference signal, the input signal is coupled to the output of the comparator with a gain of substantially +1 and during the other half period of the reference signal the input signal is coupled to the output of the comparator with a gain of substantially -1. With such an arrangement the output voltage produced at the output of the phase comparator has an average value substantially proportional to the phase angle between the reference signal and the input signal. The use of a switched pair of differential amplifiers together with a degenerative feedback arranged high gain amplifier provides for a phase comparator suitable for integrated circuit fabrication.
摘要翻译： 公开了适用于集成电路制造的相位比较器，其中一对差分放大器中的每一个通过根据周期性参考信号选择性地通过退化反馈排列的高增益放大器周期性地将输入信号耦合到比较器的输出。 在参考信号的半个周期期间，输入信号以比较器的输出为基本+1，比较器的输出耦合，而在参考信号的另一个半周期内，输入信号与比较器的输出端相连， 大幅提升-1。 通过这样的布置，在相位比较器的输出处产生的输出电压具有与参考信号和输入信号之间的相位角基本成比例的平均值。 使用一对开关差分放大器以及退化反馈布置的高增益放大器提供了适用于集成电路制造的相位比较器。
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公开(公告)号：US3840818A
公开(公告)日：1974-10-08
申请号：US40340073
申请日：1973-10-04
申请人： HITACHI LTD
发明人： SEKI K
CPC分类号： H03D13/008 , H03D2200/0009 , H04B1/1653
摘要： A full-wave rectifier circuit which comprises a differential amplifier stage, and a matrix network consisting of a plurality of resistances connected in series in the shape of an octagonal loop. The resistance matrix network receives two input signals and the inverted signals thereof, and produces a sum or a difference signal therefrom and the inverted signal thereof. The resulting signals are delivered onto one side of the differential amplifier stage, and are compared with a reference voltage signal impressed onto the other side of the differential amplifier stage. Thus, the sum or difference signal derived from the two input signals is finally full wave rectified.
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公开(公告)号：US2928955A
公开(公告)日：1960-03-15
申请号：US48556655
申请日：1955-02-01
申请人： RCA CORP
发明人： HERZOG GERALD B
CPC分类号： H04N9/455 , H03D13/008 , H03D2200/0009
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