专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US06999736B2 Transmitting apparatus 失效
公开(公告)号：US06999736B2
公开(公告)日：2006-02-14
申请号：US10038683
申请日：2002-01-08
申请人： Hitoshi Nitta
发明人： Hitoshi Nitta
IPC分类号： H04B1/04 , H04B1/38 , G05F5/00
CPC分类号： H04B1/04
摘要： A DC voltage input through an input terminal is applied through an inductor, to a power supply circuit unit and an input voltage detecting circuit. The input voltage detecting circuit detects the input DC voltage and when it is detected that the input voltage value may possibly cause malfunction, a control circuit turns off a switch circuit based on the detection output, whereby power supply from the power supply circuit to a transmission circuit is stopped, and malfunction of the transmission circuit is prevented.

2. 发明授权

US06617930B2 Power supply circuit for transmitter 失效
公开(公告)号：US06617930B2
公开(公告)日：2003-09-09
申请号：US09908626
申请日：2001-07-20
申请人： Hitoshi Nitta
发明人： Hitoshi Nitta
IPC分类号： H03F304
CPC分类号： H03F1/0227 , H03F3/24 , H04B1/1607 , H04B2001/0408
摘要： A DC voltage input to an IF, DC input is applied to a switching regulator of a power supply circuit, a DC voltage necessary for driving a power amplifier is directly applied from the switching regulator to the power amplifier, the voltage from the switching regulator circuit is applied to a voltage converter circuit from which a negative voltage of 5V is generated and applied to the power amplifier and other circuit, a positive voltage of 5V is generated from a dropper regulator circuit and applied to the power amplifier and other circuits.

3. 发明授权

US07085545B2 Transmission power control circuit 失效
公开(公告)号：US07085545B2
公开(公告)日：2006-08-01
申请号：US09985557
申请日：2001-11-05
申请人： Hitoshi Nitta
发明人： Hitoshi Nitta
IPC分类号： H01Q11/12 , H04B1/04
CPC分类号： H03G3/3036
摘要： The level of an input high-frequency signal is adjusted by a transmission-level adjusting portion, and two signals are created and distributed by a distribution portion. One of the two signals is output, while the other one thereof is applied to a frequency-deviation adjusting portion to cancel the frequency property of a detection portion and thereafter is applied to the detection portion, where the signal is detected to be a DC voltage. A comparator compares the DC voltage with a reference voltage output from a reference voltage generating portion, and the output of the comparison is used to control a gain of the transmission-level adjusting portion.

4. 发明授权

US06928273B2 Radio transmission apparatus for communication using microwave signal 失效
标题翻译：用于使用微波信号进行通信的无线发送装置
公开(公告)号：US06928273B2
公开(公告)日：2005-08-09
申请号：US10270559
申请日：2002-10-16
申请人： Hitoshi Nitta
发明人： Hitoshi Nitta
IPC分类号： H04B1/04 , H03F1/02 , H04B1/16 , H04B7/185 , H04B7/00
CPC分类号： H03F1/0211 , H04B7/18517 , H04B2001/0416 , Y02D70/446
摘要： A level detection circuit detects a signal level of an intermediate frequency signal which is superposed on a DC voltage input from an input terminal and is separately extracted by an input processing circuit, and converts the same into a corresponding DC voltage for output to a transmission output control circuit. The transmission output control circuit compares the DC voltage received from the level detection circuit with a reference voltage and determines whether the intermediate frequency signal is being input. When the transmission output control circuit determines that the intermediate frequency signal is not being input, a switch circuit cuts off the power from a power control circuit to a transmission amplifying circuit. As a result, the radio transmission apparatus can prevent wasteful power consumption and can suppress a noise and a communication error when the transmission of the intermediate frequency signal is not intended.
摘要翻译：电平检测电路检测叠加在从输入端子输入的直流电压上并由输入处理电路单独提取的中频信号的信号电平，并将其转换为相应的直流电压以输出到发送输出端控制电路。发送输出控制电路将从电平检测电路接收的直流电压与参考电压进行比较，并确定是否输入中频信号。当发送输出控制电路确定没有输入中频信号时，开关电路将功率从功率控制电路切断到发送放大电路。结果，无线发送装置能够防止浪费的功率消耗，并且能够抑制当中频信号的发送不是意图时的噪声和通信错误。

5. 发明授权

US07127219B2 Transmitter 失效
公开(公告)号：US07127219B2
公开(公告)日：2006-10-24
申请号：US09908627
申请日：2001-07-20
申请人： Hitoshi Nitta
发明人： Hitoshi Nitta
IPC分类号： H04B1/04
CPC分类号： H03G3/3036 , H03G1/0058
摘要： An input signal having an intermediate signal superposed on a DC voltage is applied to a variable attenuation circuit through an amplifier. An output of the variable attenuation circuit is detected by a detecting circuit. A DC voltage from the detecting circuit is compared with a reference voltage from a reference voltage generating circuit by a comparing circuit. Based on a comparison output, the amount of attenuation of the variable attenuation circuit is controlled, and after the output of the variable attenuation circuit is amplified by an amplifier, it is mixed with a local oscillation signal from a local oscillation circuit at a mixer circuit, converted to a microwave signal, and transmitted.

6. 发明授权

US06621382B2 Noise filter and high frequency transmitter using noise filter 失效
公开(公告)号：US06621382B2
公开(公告)日：2003-09-16
申请号：US09996798
申请日：2001-11-30
申请人： Hitoshi Nitta
发明人： Hitoshi Nitta
IPC分类号： H01P1203
CPC分类号： H01P1/2039
摘要： A main microstrip line, one end of which has an input signal supplied thereto and other end of which outputs a signal, is formed on a substrate. Five sub-microstrip lines are made to intersect with the main microstrip line, and are disposed one by one such that their lengths from the intersections to their respective ends vary. The sub-microstrip lines are each formed in a generally rectangular shape with their line widths all formed to have the same prescribed length, and are disposed all at the same prescribed intervals and generally parallel to one another.

7. 发明授权

US06504440B2 Dielectric resonance oscillation circuit 失效
公开(公告)号：US06504440B2
公开(公告)日：2003-01-07
申请号：US09773600
申请日：2001-02-02
申请人： Hitoshi Nitta
发明人： Hitoshi Nitta
IPC分类号： H03B518
CPC分类号： H03B5/187
摘要： In a feedback type oscillation circuit including a first microstrip line connected to a signal input terminal of a transistor, a second microstrip line connected to a signal output terminal of the transistor, and a dielectric resonator coupled with the microstrip lines at high frequency, the first and second microstrip lines are provided with patterns that are branched off from the respective microstrip lines, each at an arbitrary angle.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式