发明名称 |
Modulation systems and methods that compensate for DC offset introduced by the digital-to-analog converter and/or the low pass filter thereof |
摘要 |
Modulation systems and methods compensate for the DC offset that is introduced by the digital-to-analog converter and/or the low pass filter thereof. Compensation is preferably provided in the digital domain, to thereby reduce DC offset within acceptable limits for the modulation that is being used. More preferably, compensation is provided by subtracting from the digital input signal, a digital value representing the DC offset in the filtered analog signal that is introduced by the digital-to-analog converter and/or the low pass filter. A sensor senses the DC offset in the filtered analog signal. An analog-to-digital converter is responsive to the sensor to convert the sensed DC offset into a digital offset signal. A subtractor is responsive to the analog-to-digital converter to subtract the digital DC offset signal from the digital input signal and to apply the digital input signal minus the DC offset signal, to the digital-to-analog converter.
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申请公布号 |
US6100827(A) |
申请公布日期 |
2000.08.08 |
申请号 |
US19980151622 |
申请日期 |
1998.09.11 |
申请人 |
ERICSSON INC. |
发明人 |
BOESCH, RONALD D.;ARPAIA, DOMENICO |
分类号 |
H03C3/40;H04B1/707;H04L27/20;(IPC1-7):H03M1/06 |
主分类号 |
H03C3/40 |
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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