发明名称 |
POLAR MODULATION TRANSMITTER |
摘要 |
<p>A polar modulation transmitter circuit provides reduced ACPR in its output signal by controlling the relative delay between its envelope and phase modulation operations based on direct or indirect feedback measurement the output signal's ACPR. Such measurement and associated control may be based on a delay controller that includes an ACPR measurement circuit and a delay control circuit. Additionally, or alternatively, the polar modulation transmitter circuit provides a greatly extended transmit power control range by using a staged amplifier circuit that includes a driver amplifier circuit operating in combination with a power amplifier circuit to impart desired envelope modulation. In an exemplary embodiment, the driver amplifier circuit is implemented as differential transistor pairs responsive to tail current modulation. As such, the driver amplifier circuit is suited in particular for economical and space saving integration within a transmitter or transceiver integrated circuit (IC).</p> |
申请公布号 |
WO2004100483(A1) |
申请公布日期 |
2004.11.18 |
申请号 |
WO2004US13481 |
申请日期 |
2004.04.30 |
申请人 |
HADJICHRISTOS, ARISTOTELE;TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) |
发明人 |
HADJICHRISTOS, ARISTOTELE |
分类号 |
H03F1/02;H03F3/24;H04L27/36;(IPC1-7):H04L27/36 |
主分类号 |
H03F1/02 |
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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