A BiCMOS low-distortion 8-MHz low-pass filter

Willingham, Scott D.; Martin, K.; Ganesan, Aravindhan

doi:10.1109/4.261997

Cited by 84 publications

(17 citation statements)

References 23 publications

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“…In addition to this, statistical simulations show that such an architecture results in a reduced phase response sensitivity compared with a ladder topology. The most general form of the low-pass filter transfer function is given by (18) The values for the natural frequency and of the individual biquads were chosen to satisfy a 0.05 equiripple-phase characteristic [32], where (19) The biquad order was dictated by the process of minimizing transient and dc gains from the input to the integrating nodes. Specifically, the biquads are ordered according to increasing natural frequency and quality factor [10], [33].…”

Section: Resultsmentioning

confidence: 99%

A Novel Pole–Zero Compensation Scheme Using Unbalanced Differential Pairs

Ryan

McCarthy

2004

IEEE Trans. Circuits Syst. I

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Abstract-The main problem in extending continuous-time filtering to higher frequencies is the sensitivity of high-frequency filters to analog integrator nonidealities such as finite dc gain and parasitic poles. The use of a cascode stage introduces internal nodes, and hence a nondominant pole, in the signal path. This has been overcome using a novel phase compensation scheme which does not require tuning of the compensating element, and is itself unaffected by tuning of the integrator's unity-gain frequency or quality factor. The scheme is based upon a MOS version of the "multi-tanh principle" where the linear range of a transconductor is divided between at least two unbalanced differential pairs operating in parallel. The common-source node of an unbalanced differential pair is not ac ground and the associated pole-zero pair may be harnessed to cancel the parasitic pole introduced by the cascode stage. The feasibility of the proposed design was evaluated with the fabrication of a test-chip on a 0.25 m 2.5 V standard digital CMOS process. Measurements confirm that the group delay response is flat ( 2%) over a five octave frequency range (3.5-112 MHz or 0.058-1.87 ).

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Section: Resultsmentioning

confidence: 99%

A Novel Pole–Zero Compensation Scheme Using Unbalanced Differential Pairs

Ryan

McCarthy

2004

IEEE Trans. Circuits Syst. I

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“…These researches have been directed to increase frequency range of the filters [3], develop tuning systems [4] and increase the dynamic range and linearity of the filters [5,6].…”

Section: Introductionmentioning

confidence: 99%

High speed and silicon-saving adaptive tuning system for high frequency Gm-C filters

Ezzati

Abdollahzadeh

2010

Analog Integr Circ Sig Process

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In this paper, a novel adaptive tuning system used in Gm-C continuous time (CT) filters has been presented. The novelty of this method is the generation of quasi-gradient functions for the adaptive algorithm. By this method we have implemented the fully adaptive tuning algorithm on chip, and received more than 95% precision for the all characteristics of Gm-C filter. All the circuit level simulations and prototype fabrication have been done using 0.6 l CMOS technology of AMS.

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“…Another class of transconductors with the general structure shown in Fig. 1 can be recognized as transconductor-Miller-integrator (TMI) or transconductor-C-amplifier (transconductor-C-opamp) [2], [3].…”

Section: Transconductor-c-amplifier Devicesmentioning

confidence: 99%

“…They were commercially used quite early with bipolar technology [7]. They have been developed in different technologies such as CMOS [SI, bipolar [9] and BiCMOS [5], [2], [3]. They have been chosen for many industrial applications including the read channel of disk drives [9], [2], high-speed data links [lo] and digital TV and/or HDTV [3].…”

Section: Introductionmentioning

confidence: 99%