Impact of non-idealities on passive polyphase filter performance

Martinez-Perez, Antonio D.; Morte, Jorge; Aznar, Francisco; Sánchez-Azqueta, Carlos; Celma, S.

doi:10.1109/ecctd.2017.8093256

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…Typically, a passive polyphase filter (PPF) is the element that implements the single or differential to quadrature conversion or vice versa [10]. These filters are RC networks that can achieve a certain IRR for a certain desired frequency band [11]. A detailed analysis by the authors about the IRR limitations of these elements can be found in [12].…”

Section: Frequency Conversionmentioning

confidence: 99%

Analysis of Non-Idealities on CMOS Passive Mixers

et al. 2021

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In the current state of the art, WiFi-alike standards require achieving a high Image Rejection Ratio (IRR) while having low power consumption. Thus, quadrature structures based on passive ring mixers offer an attractive and widely used solution, as they can achieve a high IRR while being a passive block. However, it is not easy for the designer to know when a simple quadrature scheme is enough and when they should aim for a double quadrature structure approach, as the latter can improve the performance at the cost of requiring more area and complexity. This study focuses on the IRR, which crucially depends on the symmetry between the I and Q branches. Non-idealities (component mismatches, parasitics, etc.) will degrade the ideal balance by affecting the mixer and/or following/previous stages. This paper analyses the effect of imbalances, providing the constraints for obtaining a 40 dB IRR in the case of a conversion from a one-hundred-megahertz signal to the five-gigahertz range (upconversion) and vice versa (downconversion) for simple and double quadrature schemes. All simulations were carried out with complete device models from 65 nm standard CMOS technology and also a post-layout Monte Carlo analysis was included for mismatch analysis. The final section includes guidelines to help designers choose the most adequate scheme for each case.

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Section: Frequency Conversionmentioning

confidence: 99%

Analysis of Non-Idealities on CMOS Passive Mixers

et al. 2021

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“…where N is the number of stages. Nevertheless, nonidealities could have a great impact on filter response 9 and reduce IRR. Among these, mismatch is one of the most important.…”

Section: Passive Polyphase Filtersmentioning

confidence: 99%

Analysis of mismatch impact on image rejection ratio for passive polyphase filters

Pérez

Aznar

Royo

et al. 2018

Circuit Theory & Apps

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Passive polyphase filters (PPFs) are useful symmetric RC networks for processing analog quadrature signals. Passive polyphase filters are also used to implement differential-quadrature or quadrature-differential converters. The quality of these quadrature signals is essential to achieve good performance in modern communication systems. However, mismatch effects can produce notable degradation in the PPF frequency response, and this results in an important reduction in quadrature signal quality, being amplitude balance and phase offset notably affected. Both these errors could be summarized and evaluated together considering image rejection ratio as a figure of merit. This work deepens in the analysis of mismatch impact on PPF, studying image rejection ratio degradation for 2 PPF types, and a systematic method is proposed to obtain the worst case of mismatch in PPFs with any number of stages. It has been validated in a 65-nm CMOS technology.

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“…A causa de esto, en estándares que requieren un alto IRR (como WiFi [3]), los PPF se vuelven componentes críticos, y no-idealidades en ellos, como el mismatch, pueden provocar un desequilibrio en la red que impida alcanzar el IRR deseado [4].…”

Section: Introductionunclassified