Very-high-frequency lowpass filter based on a CMOS active inductor

Xiao, Haiqiao; Schaumann, R.

doi:10.1109/iscas.2002.1010908

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…The comparison with the literature is summarized in Table 8; it shows that the proposed filter exhibits good performance in terms of

F O M_{1}

and

F O M_{2}

; for what concerns the latter that takes into account also the bandwidth, better performance is achieved only by Xiao and Schaumann 20 that has a 3 dB bandwidth below 5GHz and by Elamien et al 12 that uses a physical inductor. However, a very good value is obtained for the dynamic range: A better value is achieved only by Centurelli et al 30 that uses a closed‐loop gain stage that improves linearity but limits the maximum frequency.…”

Section: Simulation Resultsmentioning

confidence: 96%

“…Implementations based on Gm-C are quite common in the low-GHz range, [13][14][15][16] whereas for cutoff frequencies about 10 GHz, the typical approach is based on RLC reference structures, where the physical inductor is substituted by an equivalent circuit (active inductor). [18][19][20][21][22] Centurelli et al 23 proposed a 10 GHz low-pass biquad that exploited cross-coupled transistors together with a capacitor to implement the active inductor and used this approach to design a sixth-order filter. 24 Some of the proposed filters in the low-GHz range exploit classical low-frequency approaches such as Sallen-Key [25][26][27] or Tow-Thomas 28 biquads: Their closed-loop nature should improve the linearity of the filter, whereas the maximum frequency is limited by the technology.…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, the design of multi‐GHz filters that do not make use of inductors is an active field of research, and several low‐pass and band‐pass filters have been proposed in the literature. Implementations based on Gm‐C are quite common in the low‐GHz range, 13–16 whereas for cutoff frequencies about 10 GHz, the typical approach is based on RLC reference structures, where the physical inductor is substituted by an equivalent circuit (active inductor) 18–22 . Centurelli et al 23 proposed a 10 GHz low‐pass biquad that exploited cross‐coupled transistors together with a capacitor to implement the active inductor and used this approach to design a sixth‐order filter 24 .…”

Section: Introductionmentioning

confidence: 99%

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A 17 GHz inductorless low‐pass filter based on a quasi‐Sallen–Key approach

Bocciarelli

Centurelli

Monsurrò

et al. 2023

Circuit Theory & Apps

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SummaryIn this paper, an evolution of the Sallen–Key biquad architecture is presented, suitable for applications at very high frequency. The pole of the buffer amplifier is exploited as one of the poles of the biquad, therefore overcoming the constraints it poses on the maximum resonance frequency that can be achieved. This allows designing low‐pass filters with cutoff frequencies above 10 GHz without using bulky inductors and with good linearity performance provided by the use of feedback. This approach has been exploited to design a biquad in a commercial SiGe BiCMOS technology with maximum of about 320 GHz. The biquad has been designed to provide a resonance frequency of 12 GHz and a quality factor Q of 1.9; postlayout simulations show a cutoff frequency in excess of 17 GHz, 15.75 mW of power consumption, an equivalent input noise below 1 Vrms, and −52 dB of total harmonic distortion (THD) for a 640 mVpp input signal, with a very limited area consumption.

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“…The comparison with the literature is summarized in Table 8; it shows that the proposed filter exhibits good performance in terms of