Noise and Group Delay in Active Filters

Groenewold, G.

doi:10.1109/tcsi.2007.900181

Cited by 40 publications

(34 citation statements)

References 7 publications

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“…The obtained group delay responses are displayed in Figure 3A. As predicted in (27), the center frequency appears at f 5 x opt / (2p) 5 0.5/s 0 5 0.5 GHz. For the different values of a, the analytically calculated and simulated group delay levels are perfectly well-correlated as shown in Table 2.…”

Section: Tl Attenuation Variation Parametric Analysessupporting

confidence: 63%

“…The proposed NGD cell synthesis is mainly based on the interconnect lossy line attenuation a and delay s 0 . These two parameter syntheses are established by inverting respectively (17) and (27). Accordingly, the desired value of the NGDs equal to s opt , the interconnect attenuation must be equal to:…”

Section: Synthesis Relationsmentioning

confidence: 99%

“…24 The signal and group delay effects limit the performances of RF/microwave communication devices and systems. [26][27][28] The time delay and latency, undesirably induced by the electrical interconnections, degrade the printed circuit board signal integrity. To cope with such technical issue, the NGD microwave circuit based equalization technique can be the best candidate compared to the other equalizers.…”

Section: Introductionmentioning

confidence: 99%

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Tee power divider and combiner based negative group delay topology

Ravelo

2018

Int J RF Microw Comput Aided Eng

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An innovative topology of negative group delay (NGD) microwave circuit based on the interconnected power divider and combiner (PWD/PWC) is investigated. The distributed cell consists of PWD and PWC with the input and outputs interconnected by a transmission line (TL). The theory is based on the S‐parameter modeling. The NGD existence condition is formulated. The NGD properties constituted by the NGD bandwidth, level and figure of merit are introduced. It is shown that the distributed topology behaves as a bandpass NGD circuit. The NGD topology theoretical efficiency is verified with simulations by considering NGD circuit parametric analyses by varying the PWD‐PWC interconnect TL attenuation. To validate experimentally the NGD concept, two prototypes of one‐ and two‐stage passive NGD cells were designed in microstrip technology, fabricated and tested. The one‐ and two‐stage circuit prototypes exhibit NGDs of about −2.2 ns and −4.7 ns with −3.4 dB and −7.5 dB insertion loss, respectively. The NGD phenomenon was generated around 1.85 GHz‐center frequency over about 35 MHz‐NGD bandwidth.

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Section: Tl Attenuation Variation Parametric Analysessupporting

confidence: 63%

Section: Synthesis Relationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tee power divider and combiner based negative group delay topology

Ravelo

2018

Int J RF Microw Comput Aided Eng

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“…Unlike the passive inductor where the damping resistor rL is the main noise contributor, the noise in active inductor originates from the thermal noise of MOS transistor channel [14], [15]. By referring to the transistor noise sources to the terminals of the active inductor in Figure 28(a), the noise figure of the circuit will be computed considering, for simplicity, only three main noise sources, i.e., the thermal noise of the two transistors (M1 and M2) and the noise of the load impedance Rp (i.e.…”

Section: Noise Analysismentioning

confidence: 99%

Design of CMOS Integrated Q-enhanced RF Filters for Multi-Band/Mode Wireless Applications

Gao¹

2011

Advanced Trends in Wireless Communications

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“…The natural or artificial unintentional noise and group delay (GD) effects [1][2] are one of the most critical phenomena that degrade the performance of electronic circuits. Different alternative technical solutions were explored to overcome this undesirable effect.…”

Section: Introductionmentioning

confidence: 99%

Original Theory of NGD Low Pass-High Pass Composite Function for Designing Inductorless BP NGD Lumped Circuit

Ravelo

Ngoho²,

Fontgalland

et al. 2020

IEEE Access

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This paper aims to develop an original circuit theory of inductorless NGD topology. The considered passive cell comprised of resistor and capacitor elements without inductor operates as a bandpass (BP) NGD function. The specifications of NGD functions are defined. Generally, the BP NGD fully lumped circuits available in the literature operate with resonant RLC-network. In the introduced research work, a lumped circuit was first time identified to exhibit the BP behavior without the presence of inductive component. The inductorless BP NGD topology is inspired from the combination of low-pass (LP) and high-pass (HP) NGD passive cells. Therefore, an original LP-HP NGD composite topology is obtained. The identified BP NGD topology is constituted only by passive RC-networks. Then, theoretical development of BP NGD analysis is explored. The inductorless circuit theory starts with the identification of BP NGD canonical form. Then, the expressions of NGD value, center frequency and attenuation in function of RC-network parameters are established. The synthesis equations allowing to determine the resistor and capacitor elements are derived. Proofs-of-concept are designed and prototypes are fabricated to verify the effectiveness of the developed LP-HP NGD composite theory. To validate the developed original circuit theory, two prototypes of RC-network based LP-HP NGD composite were designed, fabricated, simulated and tested. The two prototypes were synthesized with respect to two different NGD center frequencies 13.5 MHz and 22 MHz. As expected, the calculated, simulated and measurement results are in very good agreement with NGD value of about some negative nanoseconds. In the future, the characterized inductorless topology enable to overcome the traditional limitations of RLC-network based BP NGD circuits because of inductance self-effect limitation. INDEX TERMS Bandpass (BP) negative group delay (NGD), Low-pass/high-pass (LP-HP) NGD composite, Circuit theory, Inductorless passive topology.

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Noise and Group Delay in Active Filters

Cited by 40 publications

References 7 publications

Tee power divider and combiner based negative group delay topology

Tee power divider and combiner based negative group delay topology

Design of CMOS Integrated Q-enhanced RF Filters for Multi-Band/Mode Wireless Applications

Original Theory of NGD Low Pass-High Pass Composite Function for Designing Inductorless BP NGD Lumped Circuit

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