自跟蹤陷波器
AUTOMATIC TUNING LOW-PASS NOTCH FILTER
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摘要: 本文提出一種自動(dòng)調(diào)諧陷波器,其陷波中心頻率自動(dòng)跟蹤市電頻率或某一外加干擾頻率,以抑制其干擾.陷波器的諧振電路由LC組成,而電感L是用普遍阻抗轉(zhuǎn)換器(GIC)來實(shí)現(xiàn),GIC的端接電阻為壓控MOS管電阻,因此可以用一電壓控制此電阻以改變電感值,進(jìn)而控制陷波頻率.這種陷波電路可用于抑制市電頻率的干擾噪聲并防止測(cè)量或數(shù)據(jù)采集系統(tǒng)中前置放大器的飽和.實(shí)驗(yàn)結(jié)果表明在頻率從4555Hz,其陷波頻率跟蹤精度優(yōu)于0.5Hz,而陷波深度(串模抑制比)為3040dB.
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關(guān)鍵詞:
- 陷波器; 自跟蹤濾波器; 有源濾波器; 帶阻濾波器
Abstract: An automatic tuning low frequency LC low-pass notch filter is developed. The generalized immittance converter (GIC) is used as a tunable inductor.The notch frequency of the filter can track the control frequency (the frequency of power supply or interference voltage) automatically. This filter can be used to eliminate the power supply noise and to prevent the preamplifier of measurement or data aquisition system from saturating caused by the power supply interference. Experimental results show that the frequency tracking error is less that 0.5Hz in the range from 45Hz to 55Hz, and the notch depth of the filter, i.e. series mode rejection ratio, is 30-40 dB. -
B. Widrow, et al, Proc. IEEE. 63(1975)12, 1692-1716.[2]P. B. Brown, L. Malhatra. IEEE Trans. on BME, BME-25(1978)4, 392-397.[3]I.S. Han, Song B. Park, Proc. IEEE, 72(1984) 11, 1655-1657.[4]K. Martin, A. S. Sedra, IEEE Trans. on CAS, CAS-24(1977)9, 495-503. -
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