A low-pass filter with automatic frequency tuning for a bluetooth receiver

Pedro, M.; Galán, J.; Sánchez-Rodríguez, T.; Muñoz, F.; Carvajal, R.G.; Lopez-Martin, A.J.

doi:10.1109/icecs.2010.5724549

Cited by 4 publications

(6 citation statements)

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“…According to (27) we can conclude that at central frequency,  =  0 , the phase shift is zero. During tuning  0 of a band-pass filter the following condition has to be fulfilled: K BP and BW have to be constant.…”

Section: Self-tuning Biquad Band-pass Filtermentioning

confidence: 97%

“…For more details, related to Equations (1) and (2), someone can refer to [24]. The usage of OTA with voltage-controlled transconductance, contrary to the traditional approach (OTA with constant g m ), enables us to realize a voltage-controlled g m -C filters [3,8,[25][26][27].…”

Section: Description Of Phase Control Loop Elementsmentioning

confidence: 99%

“…The phase characteristic of the band-pass filter is defined by (27), where g m2 in 02 2 02 m A g R  is determined, based on (1) and (2), as:…”

Section: Self-tuning Biquad Band-pass Filtermentioning

confidence: 99%

“…The phase control loop with the band-pass filter, defined by (27) and 28, with the control (4) and  BP , is globally asymptotically stable implying that  BP →0 for any initial non-zero value of the phase shift.…”

Section: Theoremmentioning

confidence: 99%

“…taking into account (27), (4) and (28). In order to prove that the phase dynamics (29) is stable, we will use the Lyapunov's stability theorem [31].…”

Section: Theoremmentioning

confidence: 99%

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On Design of Self-Tuning Active Filters

et al. 2020

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In this paper, we present one approach in design of self-tuning all-pass, band-pass, low-pass and notch filters based on phase control loops with voltage-controlled active components and analyze their stability as well. The main idea is to vary signal delay of the filter and in this way to achieve phase correction. The filter phase characteristics are tuned by varying the transconductance of the operational transconductance amplifier or capacitance of an MOS varicap element, which are the constituents of filters. This approach allows us to implement active filters with capacitance values of order of pF, making the complete filter circuit to be amenable for realization in CMOS technology. The phase control loops are characterized by good controllable delay over the full range of phase and frequency regulation, high stability, and short settling (locking) time. The proposed circuits are suitable for implementation as a basic building RF function block, used in phase and frequency regulation, frequency synthesis, clock generation recovery, filtering, selective amplifying etc.

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Section: Self-tuning Biquad Band-pass Filtermentioning

confidence: 97%

Section: Description Of Phase Control Loop Elementsmentioning

confidence: 99%

“…The phase characteristic of the band-pass filter is defined by (27), where g m2 in 02 2 02 m A g R  is determined, based on (1) and (2), as:…”

Section: Self-tuning Biquad Band-pass Filtermentioning

confidence: 99%

Section: Theoremmentioning

confidence: 99%

“…taking into account (27), (4) and (28). In order to prove that the phase dynamics (29) is stable, we will use the Lyapunov's stability theorem [31].…”

Section: Theoremmentioning

confidence: 99%

See 3 more Smart Citations