High-frequency CMOS continuous-time filters

Khorramabadi, H.; Gray, P.R.

doi:10.1109/jssc.1984.1052249

Cited by 333 publications

(119 citation statements)

References 4 publications

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“…13(b) where we plot the error between the amplitudes responses with filter B as the reference ( output only). The amplitude error is seen to be smaller than 0.2 dB across the entire passband (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19). Fig.…”

Section: Testing Procedures and Measured Resultsmentioning

confidence: 92%

“…This amount of CMFB loop gain might be somewhat smaller than what could be obtained using a conventional CMFB scheme, but it is more than enough as far as CM stabilization is concerned. Other CMFB circuits that use unity-gain blocks instead of high gain amplifiers in the feedback path have been presented in [16]- [18].…”

Section: B Common-mode Feedbackmentioning

confidence: 99%

“…10(c) shows a scheme that adjusts so that the output CM voltage equals a certain desired value in spite of process and temperature variations. This scheme is an adaptation of the one used in [10] and is conceptually similar to the replica biasing CMFB circuits presented in [17] and [18].…”

Section: B Common-mode Feedbackmentioning

confidence: 99%

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A “Divide and Conquer” Technique for Implementing Wide Dynamic Range Continuous-Time Filters

Palaskas

Tsividis

Prodanov³

et al. 2004

IEEE J. Solid-State Circuits

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Abstract-This paper presents a technique for implementing analog filters with wide dynamic range and low power dissipation and chip area. The desired dynamic range of the filter is divided into subranges, each covered by a different filtering path optimized specifically for this subrange. This results in small admittance levels for the individual filtering paths and correspondingly small power dissipation and chip area. The system provides undis turbed output during range switching, contrary to conventional automatic gain control (AGC)/filter arrangements that generate disturbances every time the gain of the AGC changes. We also report on a low-noise highly linear CMOS transconductor useful for high-frequency applications. A chip implementing the ideas of this paper was fabricated in a 0.25-m digital CMOS process. The intended application of the filter is channel selection in an 802.11a/Hiperlan2 Wireless Ethernet receiver. The chip dissipates 9 mA, occupies an area of 0.7 mm � , and maintains a signal/(noise + IM3 distortion) ratio of at least 33 dB over a 48-dB signal range, with good blocker immunity. This performance represents at least an order of magnitude improvement over existing channel selection filters, even those that do not achieve disturbance-free operation.

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Section: Testing Procedures and Measured Resultsmentioning

confidence: 92%

Section: B Common-mode Feedbackmentioning

confidence: 99%

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A “Divide and Conquer” Technique for Implementing Wide Dynamic Range Continuous-Time Filters

Palaskas

Tsividis

Prodanov³

et al. 2004

IEEE J. Solid-State Circuits

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“…The thermal noise floor is at 7 nV/Hz 1/2 and the corner frequency is 3 kHz. The common-mode feedback is based on the transistors T 3 and T H 3 operating in the linear region [45]. Their gates are driven by the output nodes Out+ and Out-.…”

Section: Strong Inversionmentioning

confidence: 99%

CMOS Single‐chip Gas Detection Systems: Part II

2003

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Sensor arrays based on industrial CMOS-technology combined with post-CMOS micromachining (CMOS MEMS) are a promising approach to low-cost sensors. In the first part of this article [1], the state of research on CMOS-based gas sensor systems was reviewed, and a platform technology for monolithic integration of three different transducers on a single chip was described. In this second part, the transduction principles of three polymer-based gas sensors are detailed and the read-out circuitry is portrayed. The first transducer is a micromachined resonant cantilever. The absorption of analyte in the chemically sensitive polymer causes shifts in resonance frequency as a consequence of changes in the oscillating mass. The cantilever acts as the frequency-determining element in an oscillator circuit, and the resulting frequency change is read out by an on-chip counter. The second transducer is a planar capacitor with polymer-coated interdigitated electrodes. This transducer monitors changes in the dielectric constant upon absorption of the analyte into the polymer matrix. The sensor response is read out as a differential signal between the coated sensing capacitor and a passivated reference capacitor, both of which are incorporated into the input stage of a switched capacitor second-order RD-modulator. The third transducer is a thermoelectric calorimeter, which detects enthalpy changes upon ab-/desorption of analyte molecules into a polymer film located on a thermally insulated membrane. The enthalpy changes in the polymer film cause transient temperature variations, which are detected via polysilicon/aluminum thermocouples (Seebeck effect). The small signals in the lVrange are first amplified with a low-noise chopper amplifier, then converted to a digital signal using a RD-A/D-converter and finally decimated and filtered with a digital decimation filter.

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“…Two Kirchhoff relations establish a unique function from to the VCCS variables. A further Kirchhoff relation assigns a linear combination of VCCS variables and the input variable 4 The V 1 ; I 1 ; and V 6 ; I 6 class sometimes render no solution or two solutions. to the output variable.…”

Section: B Two Crucial Kirchhoff Relationsmentioning

confidence: 99%

A systematic approach to circuit design and analysis: classification of two-VCCS circuits

Klumperink

1999

IEEE Trans. Circuits Syst. I

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Abstract-This paper discusses a systematic approach to the design and analysis of circuits, using a transconductor or voltage controlled current source (VCCS) as a building block. It is shown that two independent Kirchhoff relations among the VCCS voltages and currents play a crucial role in establishing a unique transfer function in two-port circuits with two VCCS's. A class of two-VCCS circuits is defined, which can be subdivided into three main classes and 14 subclasses, based on different imposeable sets of two Kirchhoff relations. The classification is useful for circuit synthesis and analysis, as it reveals all the basically different ways to exploit two VCCS's, and allows for a unified analysis of classes of circuits. To exemplify this, all complementary metal-oxide-semiconducter (CMOS) V 0 I converter kernels, based on two matched MOS transistor (MOST)-VCCS's, are generated and analyzed with respect to distortion. It is shown that dozens of published transconductor circuits can be classified in only four classes, with essentially different distortion behavior.

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High-frequency CMOS continuous-time filters

Cited by 333 publications

References 4 publications

A “Divide and Conquer” Technique for Implementing Wide Dynamic Range Continuous-Time Filters

A “Divide and Conquer” Technique for Implementing Wide Dynamic Range Continuous-Time Filters

CMOS Single‐chip Gas Detection Systems: Part II

A systematic approach to circuit design and analysis: classification of two-VCCS circuits

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