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    • 31. 发明申请
    • Receiving band switching circuit with reduced signal loss upon switching receiving band
    • 接收频带切换电路,在切换接收频带时信号损耗减小
    • US20060040626A1
    • 2006-02-23
    • US11205612
    • 2005-08-16
    • Masaki Yamamoto
    • Masaki Yamamoto
    • H04B1/18
    • H03J5/244H03F3/191H03F3/45085H03F3/72H03F2200/111H03F2203/45142H03F2203/7215
    • A receiving band switching circuit includes a first high frequency circuit through which a first frequency band signal passes, a second high frequency circuit through which a second frequency band signal passes, and a third high frequency circuit that is provided in the back of the first and second high frequency circuits. The third high frequency circuit is constituted by a balanced circuit having balanced input terminals. The first high frequency circuit is coupled to one of the balanced input terminals, and the second high frequency circuit is coupled to the other of the balanced input terminals. When the first frequency band signal outputted from the first high frequency circuit is inputted to the third high frequency circuit, the other of the balanced input terminals is grounded. When the second frequency band signal outputted from the second high frequency circuit is inputted to the third high frequency circuit, one of the balanced input terminals is grounded.
    • 接收频带切换电路包括第一频带信号通过的第一高频电路,第二频带信号通过的第二高频电路和设置在第一频带信号的后面的第三高频电路, 第二高频电路。 第三高频电路由具有平衡输入端子的平衡电路构成。 第一高频电路耦合到平衡输入端之一,第二高频电路耦合到平衡输入端中的另一个。 当从第一高频电路输出的第一频带信号输入到第三高频电路时,平衡输入端子中的另一个接地。 当从第二高频电路输出的第二频带信号输入到第三高频电路时,平衡输入端子之一接地。
    • 32. 发明申请
    • Wide-frequency-range television tuner
    • 宽频电视调谐器
    • US20050287970A1
    • 2005-12-29
    • US11157579
    • 2005-06-21
    • Masaki Yamamoto
    • Masaki Yamamoto
    • H03J3/18H03J3/32H04B1/18
    • H03J3/185H03J3/32H03J2200/36H03J2200/37H03J2200/38
    • A television tuner includes a tuning circuit having two first varactor diodes for changing a tuning frequency, a mixer for converting a television signal to an intermediate frequency signal, an oscillator having a second varactor diode, and a PLL circuit for outputting a tuning voltage for tuning the television signal. The tuning voltage is applied to cathodes of the first varactor diodes and the second varactor diode, and voltages of anodes of the first varactor diodes and the second varactor diode are higher at a time of receiving the television signal whose frequency is lower than or equal to a predetermined frequency than at a time of receiving a television signal whose frequency is higher than the predetermined frequency.
    • 电视调谐器包括具有两个用于改变调谐频率的第一变容二极管的调谐电路,用于将电视信号转换成中频信号的混频器,具有第二变容二极管的振荡器和用于输出用于调谐的调谐电压的PLL电路 电视信号。 调谐电压施加到第一变容二极管和第二变容二极管的阴极,并且在接收频率低于或等于的电视信号时,第一变容二极管和第二变容二极管的阳极的电压较高 比接收频率高于预定频率的电视信号时的预定频率。
    • 34. 发明授权
    • Television tuner which has leveled a gain deviation in the same band
    • 电视调谐器已经在同一频带中调整了增益偏差
    • US06950152B2
    • 2005-09-27
    • US10271922
    • 2002-10-16
    • Masaki Yamamoto
    • Masaki Yamamoto
    • H03J3/18H03J5/24H04N5/50
    • H03J3/185H03J5/244
    • A gain deviation is leveled in the same band by using a varactor diode having the same characteristics as that used in an input tuning circuit for coupling the input tuning circuit and a high frequency amplifier The input tuning circuit has a tuning varactor diode whose tuning frequency varies with a tuning voltage applied to the cathode of the tuning varactor diode, a high-frequency amplifier is provided in a stage subsequent to the input tuning circuit, and a coupling varactor diode for coupling the input tuning circuit to the high-frequency amplifier, in which the cathode of the coupling varactor diode and that of the tuning varactor diode are connected with each other and a bias voltage higher than the voltage at the anode of the tuning varactor diode and lower than the lowest voltage of the tuning voltage is applied to the anode of the coupling varactor diode.
    • 通过使用与用于耦合输入调谐电路和高频放大器的输入调谐电路中使用的特性相同的变容二极管,在相同频带中增益偏移。输入调谐电路具有调谐变换二极管,其调谐频率变化 施加到调谐变容二极管的阴极的调谐电压,在输入调谐电路之后的级中提供高频放大器,以及用于将输入调谐电路耦合到高频放大器的耦合变容二极管, 其中耦合变容二极管的阴极和调谐变容二极管的阴极彼此连接,并且偏置电压高于调谐变容二极管的阳极处的电压并且低于调谐电压的最低电压,施加到 耦合变容二极管的阳极。
    • 38. 发明申请
    • Television tuner which does not deteriorate picture quality even at the time of weak electric field
    • 电视调谐器即使在弱电场时也不会降低图像质量
    • US20050122436A1
    • 2005-06-09
    • US10978920
    • 2004-11-01
    • Masaki Yamamoto
    • Masaki Yamamoto
    • H03J5/24H04N5/50
    • H04N5/50H03J5/246
    • A television tuner contains a mixer unit for converting a television signal into an intermediate frequency signal and an intermediate frequency tuning circuit provided at the next stage of the mixer unit for passing the intermediate frequency signal. The intermediate frequency tuning circuit is switched such that a tuning frequency has different values according to whether the television signal is at least a weak electric field or a strong electric field. The tuning frequency is tuned to a frequency close to a picture intermediate frequency when the television signal is at least the weak electric field, and the tuning frequency is tuned to a frequency close to a sound intermediate frequency when the television signal is at least the strong electric field.
    • 电视调谐器包括用于将电视信号转换为中频信号的混频器单元和设置在混频器单元的下一级的中频调谐电路,用于使中频信号通过。 切换中频调谐电路,使得调谐频率根据电视信号至少是弱电场还是强电场而具有不同的值。 当电视信号至少为弱电场时,将调谐频率调谐到接近图像中频的频率,并且当电视信号至少为强时,将调谐频率调谐到接近声音中频的频率 电场。
    • 39. 发明授权
    • High-frequency-signal switching circuit suppressing high-frequency-signal distortion
    • 高频信号切换电路抑制高频信号失真
    • US06904271B2
    • 2005-06-07
    • US10080734
    • 2002-02-22
    • Masaki Yamamoto
    • Masaki Yamamoto
    • H01P1/15H03F3/193H03G1/00H03G3/00H04N5/44H04B1/18
    • H03G1/0088H03G3/001
    • A high-frequency-signal switching circuit includes a first high-frequency-signal path which includes first and second diodes connected in series with a high-frequency amplifier stage therebetween, and a second high-frequency-signal path formed of a third diode connected in parallel to the first high-frequency-signal path. A switching-voltage supply section switches the high-frequency amplifier stage and first and second diodes ON, and the third diode OFF, so that a high-frequency signal is transferred through the first high-frequency-signal path, or switches the high-frequency amplifier stage and first and second diodes OFF and the third diode ON, so that a high-frequency signal is transferred through the second high-frequency-signal path.
    • 高频信号切换电路包括第一高频信号路径,其包括与它们之间的高频放大器级串联的第一和第二二极管,以及由连接到第三二极管的第三二极管形成的第二高频信号路径 与第一高频信号路径并联。 开关电压供给部使高频放大级和第一,第二二极管ON,第三二极管断开,高频信号通过第一高频信号路径传输, 频率放大器级和第一和第二二极管OFF和第三二极管导通,使得高频信号通过第二高频信号路径传送。
    • 40. 发明申请
    • Band switchable type tuning circuit of television signal
    • 频带可切换式电视信号调谐电路
    • US20050113051A1
    • 2005-05-26
    • US10991072
    • 2004-11-17
    • Masaki Yamamoto
    • Masaki Yamamoto
    • H03J3/18H03J3/28H03J5/24H04B1/18H04N5/44
    • H04N5/4446H03J3/185H03J5/244
    • A band switchable type tuning circuit has first switch mean interposed between a power supply Vcc and an anode of a switch diode, a first resistor whose one end is connected to a cathode of the switch diode, second switch means interposed between the other end of the first resistor and a ground, a second resistor connected between the power supply Vcc and a connection point of the first resistor and the second switch means, and the third resistor connected between the ground and a connection point of the first switch means and the anode of the switch diode. The first switch means and the second switch means are turned on or off together by means of a band switching voltage.
    • 频带切换型调谐电路具有介于电源Vcc和开关二极管的阳极之间的第一开关平面,其一端连接到开关二极管的阴极的第一电阻器,插入在开关二极管的另一端之间的第二开关装置 第一电阻器和地,连接在电源Vcc与第一电阻器和第二开关装置的连接点之间的第二电阻器,以及连接在地与第一开关装置和阳极的连接点之间的第三电阻器 开关二极管。 第一开关装置和第二开关装置通过带开关电压一起接通或断开。