A new feedback strategy to boost Q-factor of charge-sharing bandpass filters

Baumgratz, Filipe D.; Ferreira, Sandro Binsfeld; Steyaert, Michiel; Tavernier, Filip; Bampi, Sérgio

doi:10.1007/s10470-020-01636-7

Cited by 2 publications

(4 citation statements)

References 16 publications

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“…A CS version of the IIR filter is implemented in Fig. 6a, [24,[48][49][50][51]. In the circuit, the current i in is integrated over C S during T s creating a charge packet q in [n] defined by (3).…”

Section: A Infinite Impulse Response Filtermentioning

confidence: 99%

“…By changing the number of inputs (M ) and phases (N ) of a CS-BPF, higher-order filters can be obtained [28,49]. The general transfer function of the M/N CS BPF is presented in (8).…”

Section: Cs Complex Band-pass Filtersmentioning

confidence: 99%

“…To summarize, Q-factor and selectivity of the BPF are defined by topology and center frequency. Nevertheless, modified BPFs can increase selectivity further through advanced strategies like adding a programmable feedback structure to the differential input [37,49] or interleaved charge-sharing techniques [56], hence making the structure more flexible.…”

Section: Cs Complex Band-pass Filtersmentioning

confidence: 99%

See 2 more Smart Citations

Discrete-time Receivers, from N-Path to Charge Sharing Band-pass Filters: a Comparison

Binsfeld Ferreira,

Bozorg,

Dias Baumgratz

et al. 2023

JICS

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Technology scaling greatly benefits discrete-time and N-path filters, making them perfect for Software-Defined Radio and wireless Standards designs. Both strategies enable wide-band and narrowband solutions, high selectivity and easy programmability with low power and high linearity. This paper presents a review of discrete-time and N-path based receivers. Their architecture similarities are examined, focusing on discrete-time receiver building blocks whose features and advances are detailed. An extensive literature review of the State-of-the-Art on these strategies is conducted.

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Section: A Infinite Impulse Response Filtermentioning

confidence: 99%

“…By changing the number of inputs (M ) and phases (N ) of a CS-BPF, higher-order filters can be obtained [28,49]. The general transfer function of the M/N CS BPF is presented in (8).…”

Section: Cs Complex Band-pass Filtersmentioning

confidence: 99%

Section: Cs Complex Band-pass Filtersmentioning

confidence: 99%

See 1 more Smart Citation

Discrete-time Receivers, from N-Path to Charge Sharing Band-pass Filters: a Comparison

Binsfeld Ferreira,

Bozorg,

Dias Baumgratz

et al. 2023

JICS

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“…The 1st-order CS-BPF derives from the 4th-order IIR lowpass filter (LPF) depicted in Fig. 2a [29]. The first C H capacitor there initially stores the incoming charge packet, which corresponds to the integration of the input current during previous OFF clock phases.…”

Section: A Charge-sharing Band-pass Filtermentioning

confidence: 99%

Design of High-IF Discrete-Time Receivers for IoT: Demystifying Aliasing Trade-Offs

Ferreira

Baumgratz²,

Bampi

et al. 2022

IEEE Trans. Circuits Syst. II

Self Cite

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Discrete-time (DT) receiver (RX) architectures offer low-power implementation, high configurability, and easy portability to ever finer CMOS nodes. Such features are highly desirable in IoT applications. To fully explore their advantages, a deep understanding of aliasing impairments that they entail is critical. However, such a discussion has not been sufficiently explored in the literature. In this tutorial brief, we start with a DT filter, which is at the core of a DT-RX. Next, a highintermediate-frequency (IF) architecture is chosen to demonstrate how aliasing is an intrinsic part of a DT-RX and how it affects key system design aspects. Further on, we discuss the application of decimation techniques and the stringent trade-offs involved.

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A new feedback strategy to boost Q-factor of charge-sharing bandpass filters

Cited by 2 publications

References 16 publications

Discrete-time Receivers, from N-Path to Charge Sharing Band-pass Filters: a Comparison

Discrete-time Receivers, from N-Path to Charge Sharing Band-pass Filters: a Comparison

Design of High-IF Discrete-Time Receivers for IoT: Demystifying Aliasing Trade-Offs

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