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Very-minimum Periodic Chirp Keying (VPCK) is proposed as a novel ultra-narrow band scheme. Because of well-proportioned distribution of spectrum, this type of VPCK possesses less bandwidth and higher bandwidth efficiency. By comparing spectrum with Very Minimum Chirp Keying (VMCK), sine-like wave Very-minimum Waveform Difference Keying (VWDK), square wave Very Minimum Shift Keying (VMSK) and minimum...
A novel low-power EEG readout front-end featuring a current-mode instrumentation amplifier (CMIA) followed by a 4th-order gain-compensated source-follower-based lowpass filter (LPF) is proposed. The CMIA is of current-conveyor topology and is chopper-stabilized to improve the common-mode noise rejection and suppress the dc-offset and 1/f noise. The typical gain-loss problem of source-follower-based...
A biomedical electronics interface to detect heart signals is presented including a reconflgurable full differential fifth-order Bessel Gm-C filter and a 12 bit low-power fully differential successive approximation register analog-to-digital converter (SAR ADC). The total fully differential structure reduces the input signal noise and distortion effectively. A switch array is used in Gm-C filter to...
This paper presents a response-translation technique to realize an ultra-low-cutoff lowpass filter in small area for biopotential acquisition systems. It is by exploiting a chopper-stabilized instrumentation amplifier (IA) with bandpass characteristic to obtain a lowpass response after chopper stabilization, resulting in substantial area savings because of relaxed time constant in the implementation...
An implantable 16-channel neural recording front-end system is presented for acute neural recording. This system consists of implantable silicon-based microelectrode arrays, neural amplifiers and a microprocessor. The neural amplifiers, which have been fabricated in 0.35 μm 2P4M CMOS process, have a mid-band gain of 66.5 dB, a high cut-off frequency of 5.7 kHz. Each recording channel has a tunable...
This paper presents an integrated GMR magnetic switch designed for implantable medical devices (IMDs). Because of GMR's high sensitivity and great linearity, this magnetic switch's operation error band is much smaller than Hall-effect and AMR switches, and can operate with a magnetic field as low as 5.6|Oe|. Same as the traditionally used dry reed, GMR switch detects the magnetic signal that is transmitted...
Multiplication by one or several constants is a frequently required arithmetic operation in many DSP functions. A fast and low power implementation for single constant multiplication based on Canonical Signed Digit (CSD) was proposed by Pai et al. to extend it for multiple constant multiplication, two upper bounds for the number of partial product rows were derived. The general upper bound depends...
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