Proceedings ArticleDOI
A 3.3 volt high-frequency capacitorless electronically-tunable log-domain oscillator
S. Pookaiyaudom,Jirayuth Mahattanakul +1 more
- Vol. 2, pp 829-832
TLDR
A new type of electronically tunable oscillator using a cascade of two capacitorless first order log- domain all-pass filters as the frequency and the gain controlling element is proposed, where it is shown that the log-domain circuit technique is ideally suited for implementation of electronically Tunable oscillators.Abstract:
A new type of electronically tunable oscillator using a cascade of two capacitorless first order log-domain all-pass filters as the frequency and the gain controlling element is proposed, where it is shown that the log-domain circuit technique is ideally suited for implementation of electronically tunable oscillators, The resulting oscillator enjoys several attractive properties, namely, low supply voltage, high oscillation frequencies, wide tuning range and relatively large oscillation levels can be obtained without excessive distortions, as oppose to previously reported forward-biased diode based electronically tunable oscillators.read more
Citations
More filters
Journal ArticleDOI
Externally linear, time-invariant systems and their application to companding signal processors
TL;DR: In this paper, the authors consider externally linear, time-invariant systems which can be internally nonlinear and/or time-varying, and present several examples of the synthesis of such systems.
Journal ArticleDOI
Log domain filtering for RF applications
TL;DR: A new second-order log filter topology, which is particularly useful for RF signal processing, is introduced with a discussion of how its features meet the needs of RF design.
Journal ArticleDOI
A low-voltage ultra-low-power translinear integrator for audio filter applications
TL;DR: In this article, the design and measurement of a l-V translinear integrator and its application in a controllable second-order lowpass filter for hearing instruments is presented.
Journal ArticleDOI
Current-mode versus voltage-mode G/sub m/-C biquad filters: what the theory says
J. Mahattanakul,C. Toumazou +1 more
TL;DR: In this article, the authors investigated the general performance criteria and the speed/dynamic range limits of current-mode G/sub m/-C based filters, compared to conventional voltage-mode filters, provided that both kinds of filter topology employ the same type of transconductors and capacitors.
State-space synthesis and analysis of log-domain filters : Special section on instantaneous companding in analog signal processing
TL;DR: The use of time-varying nonlinear mappings on the state variables is shown to produce equations for the synthesis of linear, linear companding, and log-domain filters.
References
More filters
Journal ArticleDOI
Log-domain filtering: an approach to current-mode filtering
TL;DR: A novel approach to filter design, based on Adams' ‘log-domain’ filters, is proposed that yields a truly current-mode circuit realisation and, by introducing an exponential map on the state-space description of the desired linear system, a log-domain filter can be fully realised.
Proceedings ArticleDOI
A 3.3 volt electronically tunable active filter usable to beyond 1 GHz
TL;DR: It is shown that log filter topologies are possible which function well at 3.3 volts and are particularly well suited for high frequency applications since they are essentially current mode networks.
Journal ArticleDOI
Current-mirror phase-shifter oscillator
S. Pookaiyaudom,K. Samootrut +1 more
TL;DR: In this article, differential current mirrors have been used to realize phase-shifter circuits and two of these phase shifters are then cascaded to form a high-performance sinusoidal oscillator, where all active functional blocks are current mirrors.
Journal ArticleDOI
A current-tunable sinusoidal oscillator
TL;DR: In this article, a high-performance integrable current-tunable sinusoidal oscillator is proposed and experimentally investigated using a bandpass filter as the frequency-determining network.