发明名称 |
Adaptively configurable class-A/class-B transmit DAC for transceiver emission and power consumption control |
摘要 |
A power efficient and reduced electromagnetic interference (EMI) emissions transmitter for unshielded twisted pair (UTP) data communication applications. Transmit data is processed by a digital filter. The digital filter output data is converted to a current-mode analog waveform by a digital-to-analog converter (DAC). The digital filter is integrated with the DAC binary decoder in a memory device such as a ROM with time multiplexed output. DAC line driver cells are adaptively configurable to operate in either a class-A or a class-B mode depending on the desired operational modality. A discrete-time analog filter is integrated with the DAC line driver to provide additional EMI emissions suppression. An adaptive electronic transmission signal cancellation circuit separates transmit data from receive data in a bidirectional communication system operating in full duplex mode. For a multi-transmitter system, timing circuitry staggers the time base of each transmitter to reduce the aggregate EMI emissions of the multi-transmitter system.
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申请公布号 |
US2002136315(A1) |
申请公布日期 |
2002.09.26 |
申请号 |
US20020091099 |
申请日期 |
2002.03.05 |
申请人 |
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发明人 |
CHAN KEVIN T. |
分类号 |
H04B1/38;H04B3/00;H04B3/23;H04B15/00;H04J11/00;H04L5/16;H04L12/10;H04L25/00;H04L25/02;H04L25/03;H04L25/08;H04L25/14;H04L25/49;H04L27/00;H04L27/04;(IPC1-7):H04B3/00 |
主分类号 |
H04B1/38 |
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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