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The seven papers in this special section were originally presented at the 2009 IEEE Biomedical Circuits and Systems Conference (BioCAS2009), held in Beijing, China, on November 26-28, 2009.
In a cell recording system, characteristics of the cell and microelectrode array (MEA) interface impose challenging requirements on the design of front-end amplifier with regard to input-referred noise, linearity, dynamic range (DR), input impedance, pitch size and differential electrode offset (DEO) cancellation. Previous front-end amplifier designs for cell recording demonstrated 2~7 ??Vrms input...
The electric-field (EF) intra-body communication (IBC) is a promising data transmission method for high-speed low-power biomedical sensors. A good model of the EF-IBC channel is needed for better understanding the signal propagation principle and more efficient IBC transceiver design. Although various effective models have been developed for the waveguide IBC channel, the EF-IBC channel has only been...
ΣΔ beamforming is a promising technique for small analog front-end (AFE) of the medical ultrasound imaging system. Nonetheless, the high data rate from the ΣΔ modulator in the AFE and the high-Q reconstruction filter put harsh requirements on the digital beamforming circuits. Although the BScan-sample-based ΣΔ beamformer structure with FIR reconstruction filter reduces the speed requirement on multipliers...
Bio-potential detection is important for bio-medical diagnostics and research. Bio-potentials are generally weak (muV) with high offsets (100 mV level). Low noise processing is critical to extract the signal. In this paper, we report the design of a single-chip CMOS bio-potential detector. The design uses chopping to suppress the low-frequency noise in CMOS amplifiers. The strong offset is removed...
In this paper, a micropower current sample-and-hold front-end is designed for weak current bio-medical applications in a 0.35-mum standard CMOS process. The design reduces the distortion of the current-mode sample-and-hold stage by exploiting the exponential I-V relationship of weakly-inverted MOS transistors. The design and optimization process for the stage is introduced in the paper. With the optimized...
A current-mode temporal difference imager for wireless capsule-endoscopy is introduced. The new imager generates low output data rate. Wide dynamic range image can be recovered from the low-rate data at the receiver side. To reduce the circuit charge injection error of the difference imager, a calibration technique for the pixel is developed, and introduced in the paper. The image restoration error...
In this paper, a micropower current sample- and-hold front-end is designed for weak current bio-medical applications in a 0.35-mum standard CMOS process. The design reduces the distortion of the current-mode sample-and-hold stage by exploiting the exponential I-V relationship of weakly-inverted MOS transistors. The design and optimization process for the stage is introduced in the paper. With the...
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