Invention Grant
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
- Patent Title: Apparatus and method for DC offset compensation in a direct conversion receiver
- Patent Title (中): 直接转换接收机中DC偏移补偿的装置和方法
-
Application No.: US10233364Application Date: 2002-08-29
-
Publication No.: US07319852B2Publication Date: 2008-01-15
- Inventor: Nikolai Schlegel , Christian Holenstein , Daniel Filipovic , Nitin Kasturi
- Applicant: Nikolai Schlegel , Christian Holenstein , Daniel Filipovic , Nitin Kasturi
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM, Incorporated
- Current Assignee: QUALCOMM, Incorporated
- Current Assignee Address: US CA San Diego
- Agent Howard H. Seo; Ramin Mobarhan; Thomas R. Rouse
- Main IPC: H04B1/26
- IPC: H04B1/26

Abstract:
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.
Public/Granted literature
- US20040043744A1 Apparatus and method for DC offset compensation in a direct conversion receiver Public/Granted day:2004-03-04
Information query