A 40&amp;#x2013;200 MHz programmable 4&lt;sup&gt;th&lt;/sup&gt;-order G&lt;inf&gt;m&lt;/inf&gt;-C filter with auto-tuning system

Otín, A.; Celma, S.; Aldea, C.

doi:10.1109/esscirc.2007.4430283

Cited by 8 publications

(7 citation statements)

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“…It can also achieve higher accuracy because the capacitors can be better matched than OTAs. The proposed tuning circuit only contains one OTA while four OTAs are needed in [5], this leads to a less power consumption than [5]. The tuning scheme in [5] achieves a fine tuning by varying the biasing currents of the Gm, which will affect the performance of the filter.…”

Section: Resultsmentioning

confidence: 99%

“…The proposed tuning circuit only contains one OTA while four OTAs are needed in [5], this leads to a less power consumption than [5]. The tuning scheme in [5] achieves a fine tuning by varying the biasing currents of the Gm, which will affect the performance of the filter. But the proposed tuning scheme varying the capacitors to achieve fine tuning, which will guarantee a good and stable performance of the filter.…”

Section: Resultsmentioning

confidence: 99%

“…Power consumption is only Table I. Compared with the digital tuning technique in [5], the proposed tuning scheme can achieve a wider tuning range, because both 'Gm' and 'C' are tunable and in [5] only 'Gm' can be tuned. It can also achieve higher accuracy because the capacitors can be better matched than OTAs.…”

Section: Resultsmentioning

confidence: 99%

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A 5.5mW 80-400MHz Gm-C low pass filter with a unique auto-tuning system

Gao

Chen

et al. 2011

IEICE Electron. Express

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A CMOS 80-400 MHz fifth order Chebyshev Gm-C low pass filter with a unique auto tuning system is presented. Both Gm and C are tuned digitally leading to a 5X tuning range. A digital magnitude-locked loop liked tuning system is proposed. The tuning system uses a digital calibration scheme, broadening the tuning range dramatically. A fifth order Chebyshev Gm-C filter with the proposed auto tuning system was designed with TSMC 0.13 μm RF CMOS process for verification. Measurement results show that the cut-off frequency of the filter can be tuned between 80-400 MHz, with an average tuning error of no larger than 3.6%. The dynamic range of the filter for THD less than 1% is 60 dB. The power dissipation is only 5.5 mW with 1.2 V supply voltage.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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A 5.5mW 80-400MHz Gm-C low pass filter with a unique auto-tuning system

Gao

Chen

et al. 2011

IEICE Electron. Express

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“…In this case the slave system is a low-pass Butterworth filter operating in the current-mode as shown in Figure 13, with a programmable range from 40-200 MHz. Both, master and slave are implemented with a 0 dB dc-gain [19,20]. Therefore, to conclude, an indirect master-slave scheme will be designed with low-pass and band-pass biquad sections as the slave and master systems respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Even if both alternatives are adequate and reach similar results, we prefer the VCF proposal according to the difficulties encountered in the realization of a CMOS VCO with stable and repeatable center frequency in the MHz range. The master and the slave are implemented with band-pass and low-pass digitally controlled G m -C filters respectively, where transconductors introduce digital programmability [3,19,20].…”

Section: Indirect Tuning Schemementioning

confidence: 99%

Continuous‐time filter featuring Q and frequency on‐chip automatic tuning

Otín

Celma

Aldea

2009

Circuit Theory & Apps

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SUMMARYThe on-chip automatic tuning of digitally programmable continuous-time G m -C filters with a wide operation range employing a hybrid analog-digital master-slave scheme is reported in this work. The master system is implemented with a voltage-controlled filter (VCF) with the same programmable transconductance cells as the main filter to enhance the matching between master and slave. The frequency tuning method, for both analog and digital control, is based on a digital phase comparator included in the phase-locked loop achieving high-precision tunability. The digital frequency tuning is obtained with an error of ±4% and the maximum settling time when changing between two consecutive digital words is 0.3 s. Once the digital word is fixed, the analog tuning finely adjusts the value of the characteristic frequency to the reference and corrects for possible temperature variations with a settling time of 0.2 s. The analog frequency control covers the whole discrete step with a maximum error of ±5%. Furthermore, a magnitude-locked loop (MLL) Q-tuning block is simultaneously applied to the system in order to precisely control the quality factor of the G m -C filter by using an appropriate envelope detector. According to the obtained results, both post-layout simulation and experimental results, the adopted scheme has resulted as a useful and adequate solution to implement the complete auto-tuning system of digitally programmable continuous-time filters, including frequency and Q-control.

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