发明名称 |
Modulation method and apparatus |
摘要 |
A modulation circuit for use in a radiofrequency transmitter includes a local oscillator circuit configured to generate one or more local oscillator signals at a desired frequency and with a duty cycle at or about twenty-five percent, and a modulator configured to generate one or more modulated signals responsive to the one or more local oscillator signals and one or more baseband information signals. In at least one embodiment, the modulation circuit includes a modulator comprising a combined mixing and transconductance circuit that includes a transistor circuit for each baseband information signal serving as a modulation input to the modulator. Each transistor circuit comprises a first transistor driven by the baseband information signal and coupling a modulator output node to a corresponding transconductance element, and a second transistor driven by one of the one or more local oscillator signals and coupling the corresponding transconductance element to a signal ground node.
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申请公布号 |
US8588712(B2) |
申请公布日期 |
2013.11.19 |
申请号 |
US201213361163 |
申请日期 |
2012.01.30 |
申请人 |
MATTISSON SVEN;NILSSON MAGNUS;TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) |
发明人 |
MATTISSON SVEN;NILSSON MAGNUS |
分类号 |
H01Q11/12;H03F3/38;H04B1/04 |
主分类号 |
H01Q11/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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