一种消除直流失调的自动频率校准低通滤波器

doi:10.19665/j.issn1001-2400.2023.01.010

Abstract

Abstract:

In order to improve the LO leakage caused by the DC offset of the analog baseband signal in the direct conversion transmitter,and the drift of the low-pass filter due to process deviation,temperature change,and chip aging,a method of design and implementation of an automatic frequency-calibrated low-pass filter with DC offset cancellation is proposed.In the SPI(Serial Peripheral Interface) control mode,the filter can configure the cut-off frequency from 324 kHz to 648 kHz through the adjustable capacitor array.In the adaptive tuning mode,a digital-analog hybrid calibration structure based on the latched comparator is proposed.By calibrating the RC time constant of the chip,the cut-off frequency is 373.8~393.3 kHz under different PVT conditions,and the tuning accuracy relative to the nominal value of 383 kHz is -2.4%~2.7%.The chip uses 0.18 CMOS technology for tape-out verification,and the tuning circuit area is 0.045 mm²,which is only 2.2% of the main filter area.Under the 1.8V supply voltage,the power consumption of the whole filter is 6.08 mW,and the input reference noise is 38.49 nV/(Hz)^1/2.

Key words: direct conversion transmitter, low-pass filters, DC offset cancellation, auto-calibration

CLC Number:

TN432

YANG Haohan, QIAO Shushan. Automatic frequency-calibrated low-pass filter with DC offset cancellation[J].Journal of Xidian University, 2023, 50(1): 85-92.

Figures/Tables 13

References 15

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工艺角	电压/V	温度/℃	截止频率/kHz	工艺角	电压/V	温度/℃	截止频率/kHz
Typical	1.62	-25	382.9	Slow	1.8	-25	386.5
Typical	1.62	27	378.7	Slow	1.8	27	384.6
Typical	1.62	95	375.9	Slow	1.8	95	376.7
Typical	1.98	-25	385.5	Fast	1.8	-25	373.8
Typical	1.98	27	380.8	Fast	1.8	27	380.5
Typical	1.98	95	377.6	Fast	1.8	95	393.3

文献	滤波器带宽/MHz	调谐范围/%	调谐精度/%	功耗/mW	电源电压/V	工艺节点/nm
[5]	1.5~22.5		3.5	6.20~8.90	1.0	130
[6]	4~40		6.0	29.96	2.8	130
[7]	0.06~14.00	30	2.0	19.50	1.3	130
[8]	20;40;80;160	35	5.0	14.28	0.6	130
[9]	0.2;2	20	2.5	1.60	1.5	130
[14]	5;10;20;40		2.0	6.84/8.1/9.36/10.926	1.8	180
[15]	0.09~1.96 0.15~1.95		3.0	2.88~3.78	1.8	180
文中	0.324~0.648	50	2.7	6.08	1.8	180

Automatic frequency-calibrated low-pass filter with DC offset cancellation

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