发明名称 |
Interleaving analog-to-digital converter (ADC) with background calibration |
摘要 |
A system and method are provided of performing background corrections for an interleaving analog-to-digital converter (ADC). An analog input signal s1(t) is accepted having a first frequency f1 and a bandwidth (BW). The method generates a clock at frequency fs, and creates 2 sample clocks with evenly spaced phases, each having a sample clock frequency of fs/2. The method also generates a first tone signal s2(t) having a predetermined second frequency f2 outside BW. The analog input signal and the first tone signal are combined, creating a combination signal, which is sampled using the sample clocks, creating 2 digital sample signals per clock period 1/fs. The 2 digital sample signals are interleaved, creating an interleaved signal. Corrections are applied that minimize errors in the interleaved signal, to obtain a corrected digital output. Errors are determined at an alias frequency f3, associated with the second frequency f2, to obtain correction information. |
申请公布号 |
US8917125(B1) |
申请公布日期 |
2014.12.23 |
申请号 |
US201414511206 |
申请日期 |
2014.10.10 |
申请人 |
IQ-Analog Corporation |
发明人 |
Waltari Mikko |
分类号 |
H03L7/06;H03M1/06;H03M1/12 |
主分类号 |
H03L7/06 |
代理机构 |
Law Office of Gerald Maliszewski |
代理人 |
Law Office of Gerald Maliszewski ;Maliszewski Gerald |
主权项 |
1. A method of performing background corrections for an interleaving analog-to-digital converter (ADC), the method comprising:
accepting an analog input signal s1(t) having a first frequency f1 and a bandwidth (BW); generating a clock having a clock frequency fs; creating 2 sample clocks with evenly spaced phases, each having a sample clock frequency of fs/2; generating a first tone signal s2(t) having a predetermined second frequency f2 outside BW; combining the analog input signal and the first tone signal, creating a combination signal; sampling the combination signal using the sample clocks, creating 2 digital sample signals per clock period 1/fs; interleaving the 2 digital sample signals, creating an interleaved signal; applying corrections that minimize errors in the interleaved signal to obtain a corrected digital output; and, determining errors at an alias frequency f3, associated with the second frequency f2, to obtain correction information. |
地址 |
San Diego CA US |