Automated design of switched-current filters

Hughes, J.B.; Moulding, K.W.; Richardson, J.; Bennett, John R.; Redman-White, W.; Bracey, M.; Soin, Randeep Singh

doi:10.1109/4.508201

Cited by 39 publications

(21 citation statements)

References 17 publications

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“…However, in real-life the complete problem is more complicated than what is dealt with in such papers. In [5], a CAD system, called SCADS, integrated in a major VLSI suite was introduced for automated synthesis of switched-current filters. SCADS is an integrated tool set for the complete filter design process.…”

Section: Related Workmentioning

confidence: 99%

Synthesis of clock trees for Sampled-Data Analog IC blocks

Yuce

Korkmaz

Esen

et al. 2013

East-West Design &Amp; Test Symposium (EWDTS 2013)

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This paper describes a methodology for automated design of clock trees in Sampled-Data Analog Circuits (SDACs). The current practice in the industry and academia for clock tree design of SDACs is a manual process, which is time-consuming and error-prone. Clock tree design in digital domain, however, is fully automated and is carried out by what we call Clock Tree Synthesis (CTS) software. In spite of some critical differences, SDAC clock tree design problem has fundamental similarities with its digital counterpart. As a result, we were able to construct a methodology for SDACs around a commercial digital CTS software and a set of Perl & Tcl scripts. We will explain our methodology using a 10-bit 180 MHz 2-stage ADC as a test circuit.

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Section: Related Workmentioning

confidence: 99%

Synthesis of clock trees for Sampled-Data Analog IC blocks

Yuce

Korkmaz

Esen

et al. 2013

East-West Design &Amp; Test Symposium (EWDTS 2013)

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“…Sampling current mode circuits are becoming a topic of wide interest (Toumazou, Huges and Battersby 1993b). Since its introduction in 1989, the switched current technique (SI) has been developed in numerous ways (see for instance (Fiez and Allstot 1990;Jie 1993;Hughes et al 1996;Jonsson 2000;Psychalinos 2005)). Compared to switched capacitor (SC) sampled data circuits, SI circuits offer important advantages: they are exclusively composed of MOS transistors, switches and current sources, instead of operational amplifiers (OpAmps), and precise floating capacitors, making them suitable for implementation in standard CMOS processes (Toumazou et al 1993b;Hughes, Worapishet and Toumazou 2000).…”

Section: Introductionmentioning

confidence: 99%

A novel design of a fully programmable switched current filter

Fakhfakh

Loulou

2010

International Journal of Electronics

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In this study, the design of a programmable infinite impulse response switched current (SI) filter is presented. The characteristics of the filter are fully programmable by simply varying the values of out-of-chip DC current sources. The programmable switched current filter mainly consists of SI delay cells and SI multipliers. A high-performance class AB grounded gate SI memory cell is used as a basic building block. Spice simulation results are presented to show the functionality of the programmable filter.

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“…Unlike single sampling, double sampling processes two samples per clock period, thus can halve the clock frequency, lower memory cell's bandwidth, and enhance signal-to-noise ratio [18]. In addition, single-ended SI filter proposed in [22] employs current mirrors to realize signal inversion, which would introduce excess phase errors and greatly compromise the advantages of bilinear z-transform [18]. Fully-balanced structure does not have this problem, since the signal inversion can be realized simply by interchanging the two input or output terminals of the SI integrator.…”

Section: Filter Structure and Synthesismentioning

confidence: 99%

“…But, for cancelling non-ideal behaviour, several enhancement techniques such as cascode and S 2 I can be used [10][11][12][13][14][15][16]. Particularly, when S 2 I technique is selected to realize M i and J, Fig.1(a) can be specialized to the structure used in [17,18].…”

Section: Building Cellsmentioning

confidence: 99%

“…However, the generation of SI filter structure has not been investigated well so far, which has greatly impeded the widespread application of SI technique. Till now, only a few SI filter structures have been proposed, among which the LC ladder simulation structure [17,18] is considered as the optimum choice due to the lower magnitude sensitivity compared with cascade [19] and parallel [20] structures. Albeit successful in many aspects, the ladder simulation methods are normally based on a particular passive RLC prototype and can only realize limited transmission zeros [21], thus being not general enough for synthesizing the transfer function with non-conventional zeroes.…”

Section: Introductionmentioning

confidence: 99%

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Switched-current filter structure for synthesizing arbitrary characteristics based on follow-the-leader feedback configuration

Zhao

Sun

2015

Analog Integr Circ Sig Process

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 A switched-current (SI) filter structure with follow-the-leader feedback configuration has been proposed for synthesizing arbitrary transfer functions. The double-sampling fully-balanced SI bilinear integrator and current mirror are employed as the building cells in order to enhance overall performance and make circuit design more flexible. Also, explicit design formulas are derived by using coefficient matching. The third-order low-pass and band-pass filter are designed as the examples. Simulation results confirm that the presented filter structure is very suitable for the operation with high sampling-to-cutoff frequency ratio, and can synthesize arbitrary filter characteristics precisely and easily while keeping low sensitivity.

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Automated design of switched-current filters

Cited by 39 publications

References 17 publications

Synthesis of clock trees for Sampled-Data Analog IC blocks

Synthesis of clock trees for Sampled-Data Analog IC blocks

A novel design of a fully programmable switched current filter

Switched-current filter structure for synthesizing arbitrary characteristics based on follow-the-leader feedback configuration

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