A 50- to 300-MHz CMOS &lt;inline-formula&gt; &lt;tex-math notation="LaTeX"&gt;$Gm\mbox{-}C$&lt;/tex-math&gt;&lt;/inline-formula&gt; Tracking Filter Based on Parallel Operation of Saturation and Triode Transconductors for Digital TV Tuner ICs

Kwon, Kuduck

doi:10.1109/tcsii.2015.2406831

Cited by 11 publications

(4 citation statements)

References 16 publications

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“…The G m -cells constituting Z N (s) determine the notch selectivity. Because the finite output impedance of the G m -cells (G m1-3 , G m5-7 ) can degrade the notch depth and roll-off factor of the filter, negative-resistance is adopted in the G m -cells to enhance the output impedance [20], [21]. Furthermore, all the resistors and capacitors can be tuned to compensate for the variations in the dc gain, quality factor, and 3-dB cut-off frequency of the filter caused by PVT variations.…”

Section: Fifth-order Chebyshev-ii Filtermentioning

confidence: 99%

2.4 GHz BLE Receiver With Power-Efficient Quadrature RF-to-Baseband-Current-Reuse Architecture for Low-Power IoT Applications

Park

Kwon

2021

IEEE Access

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In this paper, a 2.4 GHz Bluetooth low energy receiver employing a power-efficient quadrature RF-to-baseband-current-reuse architecture is presented for low-power low-voltage internet of things applications. The proposed quadrature RF-to-baseband-current-reuse RF front-end consists of a lownoise transconductance amplifier, an active-type polyphase filter-based quadrature generator, transimpedance amplifiers, and double-balanced current-mode passive mixers on a single dc current path. An input matching network is used to perform power-constrained simultaneous noise and input power matching and 1/f noise reduction in the RF and baseband domains, respectively. The quadrature RF signals are provided to the single-quadrature mixers through an embedded active-type polyphase filter-based quadrature generator. The implemented Bluetooth low energy receiver is composed of the RF-to-basebandcurrent-reuse RF front-end, IF amplifiers, two-stage passive-RC polyphase filter, and fifth-order Chebyshev-II G m -C filters. The proposed design was fabricated using a 65-nm CMOS process and characterized primarily in the Bluetooth low energy operating frequency bands. The active die area of the implemented receiver was 0.85 mm 2 , and the receiver drew a bias current of 1.41 mA from a nominal supply voltage of 0.8 V. The Bluetooth low energy receiver achieved a noise figure of 13.2 dB, conversion gain of 42 dB, image rejection ratio of more than 30 dB, and input-referred third-order intercept point of −25 dBm.INDEX TERMS Active-type polyphase filter, bias-current sharing, Bluetooth low energy, current-reuse, image rejection ratio, IoT, I/Q mismatch, low-IF receiver, low-voltage, non-invasive filter, quadrature generator, quadrature transconductor, RF-to-BB-current-reuse

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Section: Fifth-order Chebyshev-ii Filtermentioning

confidence: 99%

2.4 GHz BLE Receiver With Power-Efficient Quadrature RF-to-Baseband-Current-Reuse Architecture for Low-Power IoT Applications

Park

Kwon

2021

IEEE Access

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“…On the other hand, some drawbacks related to the use of CMOS gm-C filters also poke out: their parasitic capacitances are often considerable and require to be taken into account in advance in the design procedure [13]; at high frequencies, the value of the transconductance varies with frequency [15]; their useful signal dynamic range is rather low due to the nonlinearity inherent to the MOS transistors [14]. Despite those disadvantages, huge efforts have been made in order to achieve gm-C structures with a salient functionality at very high frequencies [16,17], and with improved linearity [18,19].…”

Section: Introductionmentioning

confidence: 99%

CMOS Analog Filter Design for Very High Frequency Applications

et al. 2020

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A design strategy for the synthesis of high-selectivity/low-order analog filters in Complementary Metal-Oxide-Semiconductor (CMOS) technology for very high frequency (VHF) applications is presented. The methodology for the reconstitution of a given transfer function by means of Signal Flow Graphs (SFG) manipulation in canonical form is proposed leading to a fully differential g m -C biquad filter. As a practical example, the design of a notch filter intended to suppress interferers in the lower sideband (400 MHz) of the Medical Implant Communication Service (MICS), in single-poly, 6-metal layers; Mixed-Signal/RF 0.18 µm CMOS technology is realized. To compare the performance of the proposal with some other solution, the design of a 7th order elliptic notch filter based on Frequency Dependent Negative Resistors (FDNRs) was also accomplished. The attained simulation results prove that the proposal is competitive compared to the FDNR solution and some other state-of-the-art filters reported in the literature. The most salient features of the proposed notch biquad include: the selectivity, whose value is comparable to that of a 7th order elliptic approach and some other 3rd order filters; a high-frequency operation without resonators; linearity, with a +15 dBm I I P 3 ; a reduced form factor with a total occupied area of 0.004282 mm2 and mostly a low design complexity.

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“…The adaptive biasing of differential pair [14,15], using linear operation of triode-mode transistors [16,17], derivative superposition which is also called multiple-gated transistor [18][19][20][21][22][23][24] and resistive source degeneration [25,26] are among the main linearisation techniques. In addition to high linearity, the OTA in Gm-C filters should be also widely tunable.…”

Section: Introductionmentioning

confidence: 99%

“…However, the open loop operation of operational transconductance amplifiers (OTA) leads to more non‐linearity of Gm‐C filters [11–14]. The solution that has been presented in many literatures [1–29] is to design highly linear OTA.…”

Section: Introductionmentioning

confidence: 99%

Adaptive cancellation linearisation and its application to wide‐tunable Gm‐C filter design

Rezaei

2017

IET Circuits, Devices & Systems

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This paper presents an adaptive g m3 cancellation for linearisation of operational transconductance amplifier (OTA) and its application to design of a wide tunable Gm-C filter. g m3 cancellation through paralleling triode-and subthreshold-mode transconductors makes good linearisation, but only in a limited range of tuning voltage. An auxiliary circuit is employed to adaptively change the operating point of subthreshold-mode transconductor such that to keep linearisation throughout the tuning range. By this way, the linearity of OTA is significantly improved in overall transconductance tuning range from 18 to 289 μA/V. While by applying 0.6 Vpp input voltage at 1 MHz the total harmonic distortion (THD) of conventional OTA lies between −75.1 and −44.4 dB, it reduces to lie between −83.3 and −57.4 dB in the proposed OTA. Using the proposed OTA, a third-order low-pass Gm-C filter is designed in 0.18 μm CMOS technology. The cutoff frequency of filter is tunable from 1.73 to 27.25 MHz, thus, can be applicable to support WCDMA, WLAN (IEEE 802.11a/b/g/n) and WiMAX standards in multi-mode direct conversion receivers. The third-order intercept point of filter is between 7.1 and 13.7 dBm in different tuning conditions.

show abstract

A 50- to 300-MHz CMOS <inline-formula> <tex-math notation="LaTeX">$Gm\mbox{-}C$</tex-math></inline-formula> Tracking Filter Based on Parallel Operation of Saturation and Triode Transconductors for Digital TV Tuner ICs

Cited by 11 publications

References 16 publications

2.4 GHz BLE Receiver With Power-Efficient Quadrature RF-to-Baseband-Current-Reuse Architecture for Low-Power IoT Applications

2.4 GHz BLE Receiver With Power-Efficient Quadrature RF-to-Baseband-Current-Reuse Architecture for Low-Power IoT Applications

CMOS Analog Filter Design for Very High Frequency Applications

Adaptive cancellation linearisation and its application to wide‐tunable Gm‐C filter design

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