A 0.5 V tunable complex filter for Bluetooth and Zigbee using OTAs

Arya, Richa; Souliotis, George; Vlassis, S.; Psychalinos, Costas

doi:10.1007/s10470-013-0241-5

Cited by 15 publications

(5 citation statements)

References 15 publications

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“…2 depicts the Gm−C implementation of the ladder-type LPF in Fig. 1 [50]. The grounded load resistor RL and the floating input resistor RS are made by the Gmnb and the Gm1a and Gm1b stages, respectively, whereas each floating inductor is realized by four OTAs and a single capacitor (L1, e.g., by Gm2a, Gm3a, Gm1c, Gm2b and C2, and L2by Gm4a, Gm5a, Gm3b, Gm4b and C4).…”

Section: A Classical Implementationmentioning

confidence: 99%

Ladder-Type G_m -C Filters With Improved Linearity

2023

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A simple yet effective approach to improve the linearity of the transconductor-capacitor (Gm−C) filters is proposed without any area or power overhead. Following a generalized nodal analysis, the transconductors of classical filter topology are rewired such that their input differential voltage lies within the linear regime. The effectiveness of the proposed method is validated through the design and simulation of a fifth-order Butterworth low-pass filter (LPF) in a standard 65-nm CMOS process. The proposed filter implementation occupies 0.0164 mm 2 (0.003 mm 2 /pole) die area and consumes 167-µW for the cut-off frequency of 1-MHz. Operating at 1-V voltage supply, it shows an in-band total harmonic distortion (THD) of −49.14 dB for 200-mV peak-to-peak 1MHz differential voltage. An in-band 3rd-order intercept point (IIP3) of 9.36 dBm is also achieved with an in-band spurious-free-dynamic range (SFDR) greater than 53-dB, all of which reflect meaningful improvements relative to the classical architecture and despite the modest linearity performance of the internal Gm stages.INDEX TERMS Analog filter, Butterworth approximation, complementary metal-oxide-semiconductor (CMOS), continuous-time, Gm−C, linearity, low-pass filter, low-power, operational transconductance amplifier (OTA), and signal flow graph (SFG).

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Section: A Classical Implementationmentioning

confidence: 99%

Ladder-Type G_m -C Filters With Improved Linearity

2023

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“…At constant G m , the comparator's gain in (9) results in most precise auxiliary currents and highest linearization performance. However, tuning of G m through tail bias current (I B ) and/or R deg (using active resistor) makes the right side of (9) to be a function of G m value.…”

Section: Proposed Adaptive Biasing Circuitmentioning

confidence: 99%

“…Hence, the efficiency of adaptive biasing circuit degrades during tuning of G m . Even with using other schemes for tuning such as current division that is used in the proposed OTA, G m variations slope changes in various tuning conditions and therefore constant comparator's gain in (9) will not result in efficient linearization in various G m s. Hence, the circuit in Fig. 4 also needs to be adjusted under tuning of G m .…”

Section: Proposed Adaptive Biasing Circuitmentioning

confidence: 99%

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A new controllable adaptive biasing linearization technique for a CMOS OTA and its application to tunable Gm-C filter design

Rezaei

Azhari

2015

Microelectronics Journal

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“…In reference [3], a 3-orders active RC complex filter with an integrator and a digital circuit has a bandwidth of 20MHz, a center frequency of 46 MHz, and its current consumption is less than 7.9mA with the power supply of 1.8V. In reference [4], a 12-orders complex filter with controllable transconductance has bandwidths of 0.5~1.5MHz and 1~3MHz, center frequency of 1MHz and 2MHz and its power consumption is 2.77mW. Reference [5] shows a 3-orders RC complex filter applying for ZigBee, whose bandwidth is 3.09MHz, center frequency is 2MHz and current supply is 1.2mA with the working voltage of 1.8V.…”

Section: Introductionmentioning

confidence: 99%

A Design of Passband-chosen Complex Filter and Automatic Calibration System

Xi¹,

Wang²,

Zhang³

et al. 2016

Proceedings of the 2015 5th International Conference on Computer Sciences and Automation Engineering

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A low power design of active RC complex filter was proposed by using 130nm CMOS process. The filter has 4 center frequencies, 100 kHz, 200 kHz, 300 kHz and 500 kHz. The image rejection is higher than 40dB. An automatic calibration system with dichotomy algorithm and RC oscillator circuit was used to caliber both the center frequency and the band-wide. The circuit consumption of the filter and the calibration system is less than 500uA with 1.5Vsupply voltage and the calibration error is less than 1%.

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A 0.5 V tunable complex filter for Bluetooth and Zigbee using OTAs

Cited by 15 publications

References 15 publications

Ladder-Type G_m -C Filters With Improved Linearity

Ladder-Type G_m -C Filters With Improved Linearity

A new controllable adaptive biasing linearization technique for a CMOS OTA and its application to tunable Gm-C filter design

A Design of Passband-chosen Complex Filter and Automatic Calibration System

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A 0.5 V tunable complex filter for Bluetooth and Zigbee using OTAs

Cited by 15 publications

References 15 publications

Ladder-Type Gm -C Filters With Improved Linearity

Ladder-Type Gm -C Filters With Improved Linearity

A new controllable adaptive biasing linearization technique for a CMOS OTA and its application to tunable Gm-C filter design

A Design of Passband-chosen Complex Filter and Automatic Calibration System

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Product

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Ladder-Type G_m -C Filters With Improved Linearity

Ladder-Type G_m -C Filters With Improved Linearity