無線送信機
- 专利权人:
- アールエフ・チップス・テクノロジー株式会社
- 发明人:
- 五十嵐 貞男
- 申请号：
- JP2007037893
- 公开号：
- JP5006066B2
- 申请日:
- 2007.02.19
- 申请国别(地区):
- JP
- 年份:
- 2012
- 代理人:
- 摘要：
PROBLEM TO BE SOLVED: To provide a micromini radio transmitter having resistance to fluctuation in a supply voltage, consuming low amounts of power and being suited to a capsule type endoscope.
SOLUTION: This radio transmitter includes: a comparator 4 operating within a prescribed supply voltage range, shaping input signals 41 into rectangular wave-like balance signals and outputting them a low pass filter 5 for attenuating components more than third and higher harmonics contained in the output signals 43 from the comparator and outputting sinusoidal balance signals a mixer circuit 7 consisting of a circuit using a CMOS switch mechanism non-passing a direct current, mixing the sinusoidal balance signals with oscillating frequency signals and outputting the balance signals of radio frequency a power amplifier 8 for converting the balance signals of radio frequency from the mixer circuit 7 into unbalance signals and amplifying them and a band pass filter 9 for removing signals in unnecessary frequency band from the output signals of the power amplifier 8. The respective sections are formed in a CMOS process containing no organic substance.
COPYRIGHT: (C)2008,JPO&INPIT
- 来源网站：
- 中国工程科技知识中心
