A highly accurate step-response-based successive-approximation frequency tuning scheme for high-Q continuous-time bandpass filters

Pham, T.K.; Allen, P.E.

doi:10.1109/tcsii.2003.810565

Cited by 7 publications

(1 citation statement)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous approaches either have high mismatch between the elements when implemented in a small array [9], use multi-bit digital-to-analog converters at each tap, resulting in large filterbank arrays even for modest Q less than one [10], or use significant control circuitry (e.g. PLLs, DACs, ADCs) to control a single bandpass filter making an array impractical [11], [12], [8]. Figure 9 show some measured frequency responses programmed into our 32 filter filterbank IC; the entire IC was 1.5 x 1.5 lm fabricated in a 0.5 lm CMOS available through MOSIS.…”

Section: Application Of Kappa Projection For Programming Continuous-tmentioning

confidence: 99%

A kappa projection algorithm (KPA) for programming to femtoampere currents in standard CMOS floating-gate elements

Smith

Graham

Hasler

2008

Analog Integr Circ Sig Process

View full text Add to dashboard Cite

We present an algorithm that enables programming of standard CMOS floating-gate devices into ultra-low current levels. This paper looks at the limitations of conventional programming schemes for these devices, as well as new methods to achieve ultra-low current levels, reliably, in these devices. Currents range from 1 lA down to 100 fA. We present measured results programming an array of bandpass filters using floating-gate transistors using the Kappa Projection Algorithm (KPA) from 10 Hz to 48 kHz. We program out device offsets and mismatches to result in very precise device behavior within the circuit elements. Experimental data is presented from circuits fabricated on a 0.5 lm nwell CMOS process available through MOSIS.

show abstract