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    • 2. 发明授权
    • High frequency receiving device
    • 高频接收装置
    • US06954626B2
    • 2005-10-11
    • US10319627
    • 2002-12-16
    • Makoto Teramoto
    • Makoto Teramoto
    • H03L7/099H04B1/30G06F1/04
    • H04B1/30
    • A high frequency receiving device in accordance with the present invention includes a local oscillation circuit made up of multiple voltage-controlled oscillators. One of the oscillators is selected by a VCO selecting circuit. An oscillating signal, together with a high-frequency-received signal, is supplied to each mixer circuit. The signal outputs of the mixer circuits are supplied to respective LPFs to produce demodulated signal outputs. The cutoff frequencies of the LPFs are controlled by a cutoff frequency control circuit. A PLL is provided to correct shifts in the oscillation frequency of the voltage-controlled oscillator and intermittently shift in properties of the cutoff frequency control circuit. The circuit is reduced in size, and the signals related to the adjustment of the cutoff frequencies are prevented from undesirably find a path to act as noise on the base-band signal.
    • 根据本发明的高频接收装置包括由多个压控振荡器构成的本地振荡电路。 其中一个振荡器由VCO选择电路选择。 振荡信号与高频接收信号一起被提供给每个混频器电路。 混频器电路的信号输出被提供给各个LPF以产生解调信号输出。 LPF的截止频率由截止频率控制电路控制。 提供PLL来校正压控振荡器的振荡频率的偏移并且截止频率控制电路的特性的间歇性偏移。 电路的尺寸减小,并且防止与截止频率的调整有关的信号不期望地找到作为基带信号上的噪声的路径。
    • 4. 发明授权
    • Variable-gain amplifier with stepwise controller
    • 具有逐步控制器的可变增益放大器
    • US06710659B2
    • 2004-03-23
    • US10216873
    • 2002-08-13
    • Makoto TeramotoMamoru Shimoda
    • Makoto TeramotoMamoru Shimoda
    • H03G1108
    • H03G1/0023H03F3/45103H03F2203/45302H03F2203/45311H03F2203/45366H03F2203/45466H03F2203/45508H03F2203/45584
    • In a conventional variable-gain amplifier, when high-frequency signals are fed in, leak current flows through the collector-emitter parasitic capacitance of transistors, making it impossible to attenuate the gain sufficiently. A variable-gain amplifier of the invention has a controller for controlling the operation of input transistors so as to reduce the leak current that flows through transistors because of their collector-emitter parasitic capacitance when high-frequency signals are fed in and thereby prevent saturation of gain attenuation. Another variable-gain amplifier of the invention has a plurality of variable-gain amplifier circuits connected in parallel, and has a current control circuit for controlling the bias current sources provided within each of the variable-gain amplifier circuits so as to reduce the leak current that flows through transistors because of their collector-emitter parasitic capacitance when high-frequency signals are fed in and thereby prevent saturation of gain attenuation.
    • 在常规的可变增益放大器中,当馈入高频信号时,漏电流流过晶体管的集电极 - 发射极寄生电容,使得不可能充分衰减增益。 本发明的可变增益放大器具有用于控制输入晶体管的操作的控制器,以便在馈入高频信号时由于其集电极 - 发射极寄生电容而减小流过晶体管的漏电流,从而防止饱和 增益衰减。 本发明的另一个可变增益放大器具有并联连接的多个可变增益放大器电路,并且具有用于控制在每个可变增益放大器电路内提供的偏置电流源的电流控制电路,以便减少漏电流 当高频信号被馈入时由于它们的集电极 - 发射极寄生电容而流过晶体管,从而防止增益衰减的饱和。