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- Title
一种新型带宽自动校准有源低通滤波器.
- Authors
李航标
- Abstract
To eliminate the influence of process,voltage,temperature(PVT) fluctuations and aging on the bandwidth of the on-chip integrated active filter, a novel active low-pass filter ( LPF) with automatic calibration of bandwidth is proposed. By sampling the response of the active LPF to the input in time domain and comparing it with the reference voltage,the algorithm circuit adjusts the size of the filter capacitor according to the comparison result,and automatically searches for the optimal filter bandwidth. To eliminate the influence of the circuit response delay on the calibration accuracy during the process of bandwidth calibration,the calibration is performed once under the control of the first clock and is performed twice under the control of the second clock whose frequency is half of the first clock respectively,and then the final accurate filter bandwidth that is insensitive to PVT fluctuations,aging and circuit response delay is obtained by multiplication and subtraction operations. A bandwidth auto-calibration active LPF is designed under 65 nm complementary metal oxide semiconductor(CMOS) process. The simulation shows that the low-frequency gain of the filter is 67 dB,and the calibration error is within 0. 7% in the bandwidth range of 8~50 MHz.
- Subjects
CIRCUIT complexity; DELAY lines; ALGORITHMS; COMPLEMENTARY metal oxide semiconductors; BANDWIDTHS
- Publication
Telecommunication Engineering, 2021, Vol 61, Issue 10, p1308
- ISSN
1001-893X
- Publication type
Article
- DOI
10.3969/j.issn.1001-893x.2021.10.018