发明授权
US07319852B2 Apparatus and method for DC offset compensation in a direct conversion receiver
有权
直接转换接收机中DC偏移补偿的装置和方法
- 专利标题: Apparatus and method for DC offset compensation in a direct conversion receiver
- 专利标题(中): 直接转换接收机中DC偏移补偿的装置和方法
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申请号: US10233364申请日: 2002-08-29
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公开(公告)号: US07319852B2公开(公告)日: 2008-01-15
- 发明人: Nikolai Schlegel , Christian Holenstein , Daniel Filipovic , Nitin Kasturi
- 申请人: Nikolai Schlegel , Christian Holenstein , Daniel Filipovic , Nitin Kasturi
- 申请人地址: US CA San Diego
- 专利权人: QUALCOMM, Incorporated
- 当前专利权人: QUALCOMM, Incorporated
- 当前专利权人地址: US CA San Diego
- 代理商 Howard H. Seo; Ramin Mobarhan; Thomas R. Rouse
- 主分类号: H04B1/26
- IPC分类号: H04B1/26
摘要:
An apparatus for coarse compensation of a direct current (DC) offset in a direct to baseband receiver architecture utilizes a serial analog to digital converter (ADC), such as a Delta-Sigma converter, to convert the received signal to digital form. The output of the ADC is sampled for a predetermined number of samples and a counter coupled to the ADC is incremented each time the sample generated by the ADC is a logic one. The counter is not incremented if the sample from the ADC is a logic zero. After the predetermined number of samples is obtained, the counter value is indicative of the DC offset in the received signal. The counter value may be converted by a code converter to a correction value for easy operation of a digital to analog converter (DAC). If the number of samples from the ADC is a power of two, the code converted may be readily implemented by simply inverting the most significant bit (MSB) from the counter to thereby generate a twos complement version of the counter value. The correction value is coupled to the DAC to generate a compensation signal, which is provided to the received signal path in the form of a feedback signal to compensate for the DC offset.
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