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    • 7. 发明申请
    • Impedance conversion circuit and intergrated circuit including thereof
    • 阻抗转换电路及其集成电路
    • US20070247168A1
    • 2007-10-25
    • US11821726
    • 2007-06-25
    • Atsushi HirabayashiKenji Komori
    • Atsushi HirabayashiKenji Komori
    • G01R27/02
    • H03H11/40
    • An impedance conversion circuit including: a first voltage-to-current converter and a second voltage-to-current converter supplied with differential input signal voltages; an inverting amplifier; and a third voltage-to-current converter for feedback; wherein a first resistance and a second resistance are connected in series with each other between an input terminal and an output terminal of the inverting amplifier, an output terminal of the first voltage-to-current converter is connected to the input terminal of the inverting amplifier, an output terminal of the second voltage-to-current converter is connected to a connection node of the first resistance and the second resistance, the output terminal of the inverting amplifier is connected to an input terminal of the third voltage-to-current converter, an output terminal of the third voltage-to-current converter is connected to an input terminal of the first voltage-to-current converter, and an impedance is connected between the connection node and a ground.
    • 一种阻抗转换电路,包括:第一电压 - 电流转换器和提供差分输入信号电压的第二电压 - 电流转换器; 反相放大器; 以及用于反馈的第三电压 - 电流转换器; 其中第一电阻和第二电阻在反相放大器的输入端和输出端之间彼此串联连接,第一电压 - 电流转换器的输出端连接到反相放大器的输入端 第二电压 - 电流转换器的输出端连接到第一电阻和第二电阻的连接节点,反相放大器的输出端连接到第三电压 - 电流转换器的输入端 第三电压 - 电流转换器的输出端连接到第一电压 - 电流转换器的输入端,并且阻抗连接在连接节点和地之间。
    • 9. 发明授权
    • Frequency demodulation circuit
    • 频率解调电路
    • US5450033A
    • 1995-09-12
    • US287257
    • 1994-08-08
    • Atsushi Hirabayashi
    • Atsushi Hirabayashi
    • H03D3/06H03D3/00H03D3/22
    • H03D3/22H03D3/005H03D2200/0047H03D2200/0082
    • A frequency demodulation circuit having an improved detection sensitivity is provided by forming an all-pass equalizer in a Quadrature-type demodulator capable of allowing a band covering at least a carrier frequency deviation to pass therethrough. The equalizer comprises a band-pass filter for detecting the frequency deviation of an inputted FM carrier signal, a gain-doubling amplifier and a substractor for performing subtraction between the signal inputted to the band-pass filter and the output of the amplifier. The operation of the circuit is such that a FM carrier signal is supplied to the band-pass filter through a phase shifter and to a phase comparator and the output of the substractor and the FM carrier signal are compared to each other by the phase comparator to thereby obtain a FM demodulated signal.
    • 具有改善的检测灵敏度的频率解调电路通过在能够允许至少载波频率偏移的带覆盖通过的正交型解调器中形成全通均衡器来提供。 均衡器包括用于检测输入的FM载波信号的频率偏差的带通滤波器,用于在输入到带通滤波器的信号和放大器的输出之间进行减法的增益倍增放大器和减法器。 该电路的操作使得通过移相器和相位比较器将FM载波信号提供给带通滤波器,并且通过相位比较器将减法器和FM载波信号的输出彼此进行比较 从而获得FM解调信号。
    • 10. 发明授权
    • Signal amplifier
    • 信号放大器
    • US07554393B2
    • 2009-06-30
    • US11677258
    • 2007-02-21
    • Atsushi HirabayashiKenji Komori
    • Atsushi HirabayashiKenji Komori
    • H03F1/36
    • H03G3/001
    • A signal amplifier includes a discrete-variable-gain amplifying unit, a gain of which takes a discrete value and changes stepwise, a linear-variable-gain amplifying unit connected in series to the discrete-variable-gain amplifying unit, a gain of which changes continuously, control-signal outputting means for detecting a level of an output signal from a series connection circuit of the discrete-variable-gain amplifying unit and the linear-variable-gain amplifying unit and outputting a control signal corresponding to a difference between the level of the output signal and a reference voltage set as a comparative level to control the gain of the linear-variable-gain amplifying unit, and gain-switching control means for controlling to switch the gain of the discrete-variable-gain amplifying unit when the control signal deviates from a setting range for the control signal that is set according to a variable gain range of the discrete-variable-gain amplifying unit.
    • 信号放大器包括:离散可变增益放大单元,其增益取离散值并逐步改变与串联连接到离散可变增益放大单元的线性可变增益放大单元,其增益为 连续变化的控制信号输出装置,用于检测来自离散可变增益放大单元和线性可变增益放大单元的串联连接电路的输出信号的电平,并输出对应于 输出信号的电平和设定为比较电平的参考电压,以控制线性可变增益放大单元的增益;以及增益切换控制装置,用于控制当离散可变增益放大单元的增益切换时 控制信号偏离根据离散可变增益放大单元的可变增益范围设定的控制信号的设定范围。