An Analog Baseband Spectrum Sensing Circuit Employing Voltage Follower-Based Multiorder Channel Selection Filters

Jeong, Seohyeong; Kim, Dongmin; Lee, In-Young; Im, Donggu

doi:10.1109/tcsii.2022.3202218

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…In addition, sensitivity analysis can be given in the equations of ( 12) and ( 13). These equations describe dependence of the proposed filter characteristics on the passive components and parasitics of the VCII given in (1). It can be clearly seen that the general sensitivity is found as very less than unity.…”

Section: Complementary Metal-oxide Semiconductor (Cmos) Realization O...mentioning

confidence: 99%

VCII based electronically tunable multi‐mode filter structure with fourth order low‐pass function for the HF band applications

Ozenli

Yeşil

2023

Circuit Theory & Apps

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SummaryIn this paper, we propose an electronically tunable multi‐mode filter structure with fourth‐order current mode low‐pass function based on second‐generation voltage conveyor (VCII) for the analog baseband applications. The fourth‐order low‐pass circuit consists of second‐order core filter structures including band and low‐pass outputs. The proposed fourth‐order circuit's cut‐off frequency can be easily varied from 1.6 up to 17.2 MHz for the high frequency (HF) applications used in multi‐standard receivers. Also, the core circuit of the fourth‐order architecture possesses current mode and transresistance mode filter functions enabling signal conversion and different signal operations. The given architecture has 116 μm × 39 μm chip area, and post layout simulations are demonstrated extensively. In addition, the performance of the proposed structure is examined based on commercial elements (AD844s). Also, detailed linearity analysis is given using post layout extractions. In fourth‐order low‐pass structure, cut‐off frequency can be safely tuned from 1.6 up to 17.2 MHz, whereas consumed power can be reduced to 0.769 μW. It can be investigated that the proposed circuit can be safely used for the analog baseband and HF operations in wireless receivers.

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Section: Complementary Metal-oxide Semiconductor (Cmos) Realization O...mentioning

confidence: 99%

VCII based electronically tunable multi‐mode filter structure with fourth order low‐pass function for the HF band applications

Ozenli

Yeşil

2023

Circuit Theory & Apps

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Analysis of super‐source‐follower‐based GHz‐bandwidth biquadratic low‐pass filters

Chen,

Yen,

Lin

et al. 2024

Circuit Theory & Apps

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SummaryThe design of GHz‐bandwidth super‐source‐follower‐based low‐pass filters (SSF‐LPFs) is investigated. The transfer function is derived by considering transistor parasitics. The behaviors of SSF‐LPFs can be predicted accurately with these formulas. The theoretical values of pole/zero frequencies of the circuit agree well with the corresponding simulation results. Moreover, the relationship between the Q factor and the phase margin of the biquadratic filter is revealed. Two 1.3‐GHz 4th‐order LPFs are designed using 90‐nm CMOS technology, where one contains a high‐Q biquad with a small phase margin and a low‐Q biquad, while the other is built with two biquads with moderate Q factors and sufficient phase margins. For the former, the discrepancy between the theoretical and simulated phase margin is <2°, and the discrepancy between the theoretical and simulated corner frequency is <6%. For the latter, the discrepancy between the theoretical and simulated phase margin is <4°, and the discrepancy between the theoretical and simulated corner frequency is <4%. The filter containing biquads with sufficient phase margins is fabricated and occupies an area of 0.44 mm2. Consuming 14.4 mW, the filter delivers a bandwidth of 1.3 GHz, P1dB of −11.94 dBm, and IIP3 of −4.5 dBm.

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An Analog Baseband Spectrum Sensing Circuit Employing Voltage Follower-Based Multiorder Channel Selection Filters

Cited by 2 publications

References 9 publications

VCII based electronically tunable multi‐mode filter structure with fourth order low‐pass function for the HF band applications

VCII based electronically tunable multi‐mode filter structure with fourth order low‐pass function for the HF band applications

Analysis of super‐source‐follower‐based GHz‐bandwidth biquadratic low‐pass filters

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