Dynamic-range analysis and maximization of micropower G[subscript m]-C bandpass filters by adaptive biasing
نویسندگان
چکیده
We analyze and present an input gain-varying scheme for maximizing dynamic range in a well-known Gm–C bandpass filter by both minimizing noise for small input signals, and by achieving balanced swing levels at all filter nodes for large input signals. A micropower bandpass filter suitable for use in cochlear implants and other powerconstrained biomedical applications was implemented and tested in subthreshold CMOS. At a center frequency of 1.4kHz and quality factor of 4, the filter has 70dB of dynamic range (57dB maximum SNR, 2.5% total harmonic distortion (THD)) and consumes 2.55μW of power.
منابع مشابه
Dynamic-range Analysis and Maximization of Micropower Gm-C Bandpass Filters by Adaptive Biasing
We analyze and present an input gain-varying scheme for maximizing dynamic range in a well-known Gm–C bandpass filter by both minimizing noise for small input signals, and by achieving balanced swing levels at all filter nodes for large input signals. A micropower bandpass filter suitable for use in cochlear implants and other powerconstrained biomedical applications was implemented and tested ...
متن کاملA Practical Micropower Programmable Bandpass Filter for Use in Bionic Ears
Subthreshold filters offer the low power and wide tunable range required for use in fully implantable bionic ears. The major design challenge that must be met is increasing the linear range. A capacitive-attenuation technique is presented and refined to allow the construction of wide-linear-range bandpass filters with greater than 1 pp swings. For a 100–200 Hz fully differential filter with sec...
متن کاملA Micropower Multi Decade Dynamic Range Current-Mode True RMS-to-DC Converter
A log-domain current-mode true RMS-to-DC converter based on a novel synthesis of a simplified current-mode low pass filter and a two-quadrant squarer/divider is presented. The circuit employs floating gate MOS (FG-MOS) transistors operating in weak inversion region. The converter features low power(
متن کاملOp Amp Noise in Dynamic Range Maximization of Integrated Active-RC Filters
In this paper a method is proposed for maximizing the dynamic range of active-RC and MOSFET-C filters, so that IC implementation constraints are satisfied and a given transfer function is realised. Both op amp generated noise and resistor thermal noise are taken into account in the calculation of dynamic range. By introducing a special transformation of variables, an almost-explicit solution of...
متن کاملExtending the Radar Dynamic Range using Adaptive Pulse Compression
The matched filter in the radar receiver is only adapted to the transmitted signal version and its output will be wasted due to non-matching with the received signal from the environment. The sidelobes amplitude of the matched filter output in pulse compression radars are dependent on the transmitted coded waveforms that extended as much as the length of the code on both sides of the target loc...
متن کامل