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    • 84. 发明公开
    • Delay detection circuit and low-noise oscillation circuit using the same
    • 检测器电路具有时间延迟,和低噪声振荡器具有这样的电路
    • EP0723340A1
    • 1996-07-24
    • EP96300272.0
    • 1996-01-15
    • JAPAN RADIO CO., LTD
    • Yamashita, KazuoAdachi, Nobuyuki
    • H03L7/02H03L7/113H03D3/00
    • H03L7/02H03L7/113
    • When the oscillation output of a VCO (10) is to be supplied to high frequency mixers (14-1, 14-2), a quadrature form is givena by a π/2 phase shifter (24) in the front stage of the high frequency mixer (14-2). High frequency components are removed from the output voltages of the high frequency mixers (14-1, 14-2) by LPF's (16-1, 16-2). DC components are further removed from the output voltages of the high frequency mixers (14-1, 14-2) by HPF's (26-1, 26-2). The output voltages of low frequency mixers (28-1, 28-2) contain secondary phase noise components proportional to squared phase noise components and primary phase noise components proportional to the phase noise components and also depending on the delay time τ of a delay unit (12). When the output voltage of the low frequency mixer (28-2) is subtracted from the output voltage of the low frequency mixer (28-1), the secondary phase noise components are offset and the dependence on the delay time τ is removed from the primary phase noise components. The resulting voltage is used as a control voltage for the VCO (10). No voltage controlled delay unit or feedback loop for controlling it are required.
    • 该电路包括由一延迟输出的第一高频混频器乘法哪个振荡输出的。 振荡输出由延迟了预定时间,以产生一个第一高频信号。 第二高频混频器乘以一个相移(24)输出的振荡延迟输出振荡,通过PI / 2弧度延迟获得,以产生一个第二高频信号。 第一低频混频器使在由所述第二高频信号中的相位噪音成分与第一高频信号中的DC和相位噪声分量,以产生一个第一低频信号。 第二低频混频器使在通过在第一高频信号中的相位噪声分量的第二高频信号中的DC和相位噪声分量,以产生一个第二低频信号。 加减法器通过去除来自在所述第一低频信号初级相位噪声分量的预定的延迟时间的依赖响应第二低频信号。 没有依赖性产生的控制电压。
    • 85. 发明公开
    • Class AB push-pull drive circuit, drive method therefor and class AB electronic circuit using the same
    • AB类基因时钟驱动器电路,用于驱动和具有这种驱动电路的AB类电子电路。
    • EP0664608A1
    • 1995-07-26
    • EP95300230.0
    • 1995-01-13
    • JAPAN RADIO CO., LTD
    • Yamashita, Kazuo, c/o Japan Radio Co., Ltd.Adachi, Nobuyuki, c/o Japan Radio Co., Ltd.Nishibe, Masatoya, c/o Japan Radio Co., Ltd.Egawa, Masahiko, c/o Japan Radio Co., Ltd.Inoue, Akiharu, c/o Japan Radio Co., Ltd.
    • H03F3/45
    • H03F3/45479H03F3/45071H03F3/45076
    • Two NPN transistors (Q₁ and Q₂) and two PNP transistors (Q₃ and Q₄) have their emitters are connected together. Constant voltage circuits (1 and 2) maintain voltages between the bases of transistors (Q₁ and Q₃) and between the bases of transistors (Q₂ and Q₄) constant. A differential input voltage (V i ) is applied to between the bases of the transistors (Q₁ and Q₂). The collector currents (I₁, I₃ and I₂, I₄) increase or decrease in an exponential and differential manner. The collector currents (I₁, I₃ or I₂, I₄) are inverted and added to provide a class AB drive current and to increase the output amplitude. The symmetry can also be improved. Since any difference between signal amplification paths is eliminated, a differential phase between path lengths is less likely to be generated in the high-frequency region. Since there is no feedback or the like for class AB drive, it is difficult for any abnormal oscillation to be produced. Since the constant voltage circuits (1 and 2) are formed by diodes (D₁ - D₄), the temperature characteristics of the transistors (Q₁ - Q₄) can be compensated. Furthermore, the class AB push-pull drive circuit can be driven by a relatively low voltage. The transistors (Q₁ - Q₄) may be replaced by FETs.
    • 两个NPN晶体管(Q1和Q2)和两个PNP晶体管(Q3和Q4)具有它们的发射极被连接在一起。 恒压电路(1和2)保持晶体管的基极(Q1和Q3)之间和晶体管(Q2和Q4)恒定的基极之间的电压。 差分输入电压(V1)施加到晶体管(Q1和Q2)的基极之间。 集电极电流(I1,I3和I2,I4)增加或指数和差方式减少英寸 集电极电流(I1,I3或I2,I4)被反转并添加到提供甲乙类驱动电流,以增大输出幅度。 因此对称性可以得到改善。 由于信号放大路径之间的任何差异被消除,路径长度之间的差分相位是不太可能在高频区域中产生。 由于没有反馈或类似物用于甲乙类驱动器,是困难的要被产生的任何异常振荡。 由于恒压电路(1和2)通过二极管(D1 - D4)形成时,晶体管(Q1 - Q4)的温度特性进行补偿。 进一步,甲乙类推挽驱动电路可以由相对较低的电压来驱动。 晶体管(Q1 - Q4)可通过的FET来代替。
    • 86. 发明公开
    • Automatic frequency control circuit
    • Automatische Frequenzregelungsschaltung。
    • EP0662754A1
    • 1995-07-12
    • EP95104800.8
    • 1993-06-23
    • JAPAN RADIO CO., LTD
    • Suganuma, Gen, c/o Japan Radio Co.,Ltd.
    • H03J7/06
    • H03D7/16H03J7/026H03J7/06H03J7/065
    • An automatic frequency control circuit mounted on a mobile station in mobile communication. The automatic frequency control circuit performs feedback control of an oscillation frequency of a local oscillator used in conversion of a reception frequency to an intermediate frequency signal in response to the count result of the frequency of the intermediate frequency signal. If a receiver is not in the hand-off state, counting is performed for comparatively long time; if in the hand-off state, counting is performed for comparatively short time conforming to required stabilization performance at hand off. Occurrence of variations in count values caused by fading is detected, and only the count values worthy of trust are used as a base of control. A level drop caused by fading is compensated by self-oscillation.
    • 一种在移动通信中安装在移动台上的自动频率控制电路。 响应于中频信号的频率的计数结果,自动频率控制电路对接收频率转换为中频信号的本地振荡器的振荡频率进行反馈控制。 如果接收机不处于切换状态,则进行相对长时间的计数; 如果处于切换状态,则在相当短的时间内进行计数,以符合所需的稳定性能。 检测到由衰落引起的计数值的变化的发生,只有值得信赖的计数值被用作控制的基础。 由衰减引起的电平降低由自振振荡补偿。
    • 87. 发明公开
    • Receiver and method of receiving
    • 接收方和接收方法
    • EP0637130A3
    • 1995-05-10
    • EP94300220.4
    • 1994-01-12
    • JAPAN RADIO CO., LTD
    • Suganuma, GenKumagai, YukihikoHigaki, Kenji
    • H03G3/20H03G1/04
    • H03G3/3052H03G1/04H03G3/3068
    • A receiver comprises an AGC circuit including a low noise amplifier for amplifying a reception input signal and an AGC amplifier, a level detection circuit for producing a strength indication signal indicative of an input field strength, and a demodulator. The receiver has a function of controlling a gain to keep an amplitude of a demodulator input signal at a constant level. A bias control circuit controls on and off of a bias voltage source to allow and inhibit supply of a bias voltage to the low noise amplifier when the strength indication signal has a signal level lower than and not lower than a first threshold level, respectively. When the signal level is thereafter decreased to a second threshold level lower than the first threshold level, the bias control circuit turns on the bias voltage source to supply the bias voltage. A level output circuit serves to keep the strength indication signal at a predetermined high level when the bias voltage source is turned off.
    • 接收机包括AGC电路和解调器,AGC电路包括用于放大接收输入信号的低噪声放大器和AGC放大器,用于产生指示输入场强度的强度指示信号的电平检测电路。 接收器具有控制增益以将解调器输入信号的幅度保持在恒定水平的功能。 当强度指示信号具有低于和不低于第一阈值电平的信号电平时,偏置控制电路控制偏置电压源的接通和断开以允许和禁止向低噪声放大器提供偏置电压。 当此后信号电平降低到低于第一阈值电平的第二阈值电平时,偏置控制电路接通偏置电压源以提供偏置电压。 当偏置电压源关闭时,电平输出电路用于将强度指示信号保持在预定的高电平。