A Si 1.8 GHz RLC filter with tunable center frequency and quality factor

Pipilos, S.; Tsividis, Y.; Fenk, J.; Papananos, Y.

doi:10.1109/4.540064

Cited by 128 publications

(47 citation statements)

References 12 publications

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“…2 Operating at high gain and high mode, the filter presents slightly a higher noise figure, but the measurement can be more accurate because the gain appearing after the probe exhibits a few decibels instead of loss in the low gain mode. As 2 An error analysis indicates that the actual noise figure may be up to 1 dB higher or lower than the measured value due to tolerances in the measurement. used at the narrower 27-MHz bandwidth, the compression point is 23 dBm due to the higher associated gain.…”

Section: Measured Resultsmentioning

confidence: 99%

“…A 6:1 voltage step-up balun formed by L2 and C2 is employed to convert the unbalanced 50-source to a differential source for differential input stage M1a/b. The ideal upconversion ratio is given by (2) where is resonant angular frequency of the balun and denotes the 50-source. Due to the finite for the inductor L2a and L2b (around 20 in implementation), each one presents a series resistance of ; thus the actual ratio is (3) and the transformed differential source impedance seen by M1a/b is (4) This conversion increases the percentage of the total output noise contributed by the source, therefore decreasing the noise figure.…”

Section: B Input Matching Networkmentioning

confidence: 99%

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A 2.5-GHz low-power, high dynamic range, self-tuned Q-enhanced LC filter in SOI

Kuhn

2005

IEEE J. Solid-State Circuits

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Abstract--enhanced LC filter technology offers a promising approach to remove the off-chip preselect filter still required in current transceivers. However, reported designs fail to meet stringent system specifications such as dynamic range and noise figure for existing wireless standards. The complexity and inaccuracy of frequency and tuning have also prevented acceptance in industry applications. This paper presents a low-power and high-performance design targeted at Bluetooth in a silicon-on-isolator (SOI) CMOS process. Drawing 5 mA from a 3-V supply, it achieves 23-dB voltage gain (14-dB power gain), approximately 6-dB noise figure, and a 153-dB Hz 1-dB compression point dynamic range, when operating with a 70-MHz bandwidth at 2.5 GHz. A simplified approach to frequency and tuning is also demonstrated, making -enhanced LC filtering feasible in industry application for the first time.

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Section: Measured Resultsmentioning

confidence: 99%

Section: B Input Matching Networkmentioning

confidence: 99%

A 2.5-GHz low-power, high dynamic range, self-tuned Q-enhanced LC filter in SOI

Kuhn

2005

IEEE J. Solid-State Circuits

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“…Automatic frequency tuning schemes for LC filters have already been developed [3], [5], and [6]. They employ the same techniques used for -filters [7]- [11].…”

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confidence: 99%

An Accurate Automatic Quality-Factor Tuning Scheme for Second-Order <emphasis emphasistype="italic">LC</emphasis> Filters

Bahmani

Serrano-Gotarredona

Sánchez-Sinencio

2007

IEEE Trans. Circuits Syst. I

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Abstract-This paper presents a scheme to accurately tune the quality factor of second-order LC bandpass filters. The information of the magnitude response at the center and one of the cutoff frequencies is used to tune both the amplitude and the quality factor of the filter using two independent yet interacting loops. Furthermore, the synergic interaction between the loops makes the proposed scheme stable and insensitive to the mismatch between the input amplitudes. A chip prototype was implemented in a 0.35-m CMOS process and consumes 4.3 mA from a single 1.3-V supply. Measurement results show that at 1.97 GHz the quality factor is tunable from 60 to 220 while the amplitude is tunable between 15 and 0 dBm with worst case quality factor and amplitude tuning accuracies of 10% and 7%, respectively.

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“…In fact, the addition of the negative resistance: 1) modifies the P 1dB of the circuit to P 1dB Q 0 /Q and 2) modifies the P n of the circuit to P n Q/Q 0 . Although there has been more than a decade research on these types of BPFs, most of the designs do not achieve enough DR which is to a first degree is due to the limited Q-factor of on-chip inductors [9,10,11,12,13,14,15,16,20,21,23,24,26,27,28,29,30,31,32,33]. …”

Section: Performancementioning

confidence: 99%

“…These filters were typically off-chip, bulky and expensive which led to penalties in terms of cost, form factor and less design flexibility. The push towards single-chip solutions led to a tremendous amount of research on the integration of these bandpass filters [9,10,11,12,13,14,15,16]. Analog BPFs have been notoriously difficult to implement on-chip.…”

Section: Introductionmentioning

confidence: 99%

Active N-path Filters: Theory and Design

Darvishi¹

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A Si 1.8 GHz RLC filter with tunable center frequency and quality factor

Cited by 128 publications

References 12 publications

A 2.5-GHz low-power, high dynamic range, self-tuned Q-enhanced LC filter in SOI

A 2.5-GHz low-power, high dynamic range, self-tuned Q-enhanced LC filter in SOI

An Accurate Automatic Quality-Factor Tuning Scheme for Second-Order <emphasis emphasistype="italic">LC</emphasis> Filters

Active N-path Filters: Theory and Design

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