Novel Tuning Scheme for Integrated Continous-Time Filter  

Oleh:

Noerbambang, Lise S. ; Kunieda, Hiroaki ; Samadikun, Samaun

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Proceedings Institut Teknologi Bandung vol. 33 no. 2 (2001), page 53-59.
Topik: C.T. Filter; Automatic Tuning; Direct Tuning; OTA
Fulltext: Llse S. Noebambang.PDF (633.34KB)

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Perpustakaan Pusat (Semanggi) Nomor Panggil: PP32 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

In integrated continuous times (C.T.) filters, automatic tuning is very important, because the filter coefficients are very sensitive to device parameters. In this paper, novel tuning scheme for the integrated C.T. hand pass bi-quad filter is presented. This tuning scheme is used to tune the center of frequency (f0) of a band pass bi-quad filter which is 550 KHz. The band-with of this filter is 535 KHz and the quality factor Q is equal to one. This filter consists of four CMOS operational trans-conductance amplifier (OTA) and two capacitors. The tuning scheme is realized with CMOS OTAs, a CMOS four quadrant analog multiplier with voltage output, a low pass filter and a DC amplifier. By varying the capacitor values of the band pass bi-quad filter 40% in both direction from the nominal value and varying the temperature from -100°C to 50°C, the center frequency of the filter remain constant at 550 KHz. It is simulated using SPICE software and operates with power supply voltages of ±5 V. Simulated results are presented and discussed.

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