CMOS floating active inductor and its applications to bandpass filter and oscillator designs

Thanachayanont, A.; Payne, A.J.

doi:10.1049/ip-cds:20000053

Cited by 106 publications

(45 citation statements)

References 13 publications

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“…The linearity error is less than 3%. For comparison, the relation between the frequency and the bias current obtained by the conventional bandpass-filter (BPF)-based VCO in [10] is also shown in Fig. 3 (a).…”

Section: Resultsmentioning

confidence: 99%

“…LC -tuned VCOs are based on two classical oscillator models: one is based on the positive-feedback LC -tuned oscillator with the 2nd-order loop gain (namely LC -bandpass oscillator), the other on the negative-feedback one with the 3rd-order loop gain (namely Colpitts or Hartley oscillator). VCOs based on the former LC -bandpass oscillator is reported in [9,10]. In these VCOs, the inductor is simulated by interconnecting two matched OTAs and a grounded capacitor, and the resultant equivalent inductance is inversely proportional to the square of the transconductance gain of OTAs.…”

Section: Introductionmentioning

confidence: 99%

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Colpitts VCO using temperature-stable linear OTAs

Chung

Son

Kim

2013

IEICE Electron. Express

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Abstract:An LC -tuned sinusoidal voltage-controlled oscillator (VCO) using temperature-stable linear operational transconductance amplifiers (OTAs) is presented. Its architecture is based on Colpitts oscillator configuration, where the inductor is simulated one realized with four OTAs and a grounded capacitor. A prototype VCO built with discrete components exhibits less than 3% nonlinearity in its currentto-frequency transfer characteristic from 0.7-40 MHz and 95 ppm/ • C temperature drift of oscillation frequency over 0 to 75 • C. The total harmonic distortion (THD) is as low as 2.9% with a peak-to-peak amplitude of 0.7 V for a specified frequency-tuning range. The phase noise of the VCO is about −105.2 dBc/Hz at 1 MHz offset frequency.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Colpitts VCO using temperature-stable linear OTAs

Chung

Son

Kim

2013

IEICE Electron. Express

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“…The active inductor philosophy [27] can suitably solve the twofold problems: in a way, the required area is drastically reduced; on the other hand, standard low-cost technology can be used with confidence and high Qvalue (more than 100) can be easily obtained by controlling the associated losses via negative resistance feedback technique [28,29]. However, along with the earlier advantages, there is a drawback of poor noise performance [30,31].…”

Section: Introductionmentioning

confidence: 99%

Design of active inductors in SiGe/SiGe:C processes for RF applications

Chakravorty

Scholz

Senapati

et al. 2007

Int J RF and Microwave Comp Aid Eng

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Applicability of silicon-based heterojunction bipolar processes is investigated for designing active inductors with high quality factors (Q). Results for grounded type oneport active inductor incorporating frequency-dependent as well as frequency-independent negative resistances are examined. Later, the negative resistance aspect is extended from one-port to two-port active inductor circuit to ensure its use as a series element. The enhanced Q-values of all the inductive circuits are observed in accordance with the theory. Moderately high-Q values (∼100) with considerable inductances (∼0.2-1 nH) are obtained in the RF frequency ranges (∼5-9 GHz).

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“…Its applications can be found in active filters, oscillators, and system response compensation [1][2]. However, to implement spiral inductors in integrated circuits is still a problem because of their disadvantageous in the usage of space, weight, cost and tunability.…”

Section: Introductionmentioning

confidence: 99%

Floating Inductance Simulators Based on Active Components

Zhou¹,

Zeng²

2017

dtetr

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Floating inductance simulators are designed in the paper. only two active components, one capacitor and one ground resistor are adopted in each simulator. A fifth-order low-pass filter is designed to verify the properties. All the circuits are simulated in a 0.18μm CMOS process. The consistent in the simulating results and the theoretical analysis results proves that the floating inductance simulators based on active components are reasonable and practicable.

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CMOS floating active inductor and its applications to bandpass filter and oscillator designs

Cited by 106 publications

References 13 publications

Colpitts VCO using temperature-stable linear OTAs

Colpitts VCO using temperature-stable linear OTAs

Design of active inductors in SiGe/SiGe:C processes for RF applications

Floating Inductance Simulators Based on Active Components

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