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A 14b 750MS/s 21.1mW current steering digital-to-analog converter (DAC) is presented, which maintains <-168dBm/Hz noise spectral density beyond the Nyquist frequency to minimize TX leakage in SAW-less FDD LTE. A hybrid wideband R-2R LSB segmentation with an impedance attenuator minimizes glitch noise across process and temperature without requiring accurate scaling of switches and switch drivers...
In this paper, a bended differential transmission line using the L-shaped pad is proposed to suppress the differential-mode noise. The bended differential transmission line using the L-shaped pad can reduce the differential-to-common mode conversion from −6.58 dB to −10.10 dB and the TDR differential-mode noise from 0.087 V to 0.023 V as compared with the bended differential transmission line using...
DC/DC converters are widely used to provide various power supply voltages required for many electronic components on a board. Though DC/DC converter is more efficient than the linear regulator is, however, the switching noise becomes larger with the increase of the switching frequency. In particular, ringing noises at the sharp rising edge of the switching waveform occurs by the effect of the parasitic...
A fully-digital True Random Number Generator (TRNG) measures the frequency difference between two free-running ring oscillators, or in other words the beat frequency, to extract random frequency jitter. For generating a continuous stream of random bits with a high entropy level, the lower significant bits meeting the NIST randomness criteria are concatenated. The generation efficiency is further improved...
This paper presents a biopotential analog front-end (AFE) IC for measuring electroencephalogram (EEG). The AFE is based on the AC-coupled chopper stabilized instrumentation amplifier architecture to achieve the low noise. To increase the input impedance, the capacitive input impedance boosting loop (CIIBL) is proposed. The CIIBL forms a positive feedback loop between input and output of the instrumentation...
This paper presents an original concept of a 3D-PICS High density Integrated Passive Device Technology with P+ guard rings realized in a 300µm depth High Resistivity Silicon Substrate (HRS) in order to reduce significantly the substrate noise coupling. In this paper, a 3D-PICS IPD test chip was studied as the passive part prototype of a System-In-Package chip in combination with RF transceiver operating...
A novel completely inverter-based ADC driver is proposed that relaxes the gain and unity gain bandwidth requirements of the negative feedback loop by making it not see the closed loop gain. This ADC driver has a built-in first order anti alias filter and uses a passive amplifier to provide a rail-to-rail sampled output signal. This design exploits the linearity of current mirrors and achieves 65dB...
This paper presents a power-supply noise canceller (PSNC) for current-steering DAC for high-speed and high-throughput wireless communication systems. Proposed PSNC effectively detects power-supply noise (PSN) and controls the current sources so that PSN would be removed at the output signal. The fabricated 2.24-GHz, 6-bit DAC has demonstrated a maximum of 8.4-dB PSN-reduction. Also, this DAC achieved...
We present a 200 MS/s 2x interleaved 14 bit pipelined SAR ADC in 28nm digital CMOS. The ADC uses a new residue amplifier for low noise at low power, and incorporates interleaved channel time-constant calibration. The ADC achieves a peak SNDR of 70.7 dB at 200 MS/s while consuming 2.3 mW from an 0.9 V supply.
The noise mode conversion between common-mode and differential-mode can occur in power electronics circuits because of the unbalance in the circuits. In this study, an equivalent circuit of an electromagnetic interference (EMI) filter was built, in which the leakage of the magnet flux of the common-mode choke was taken into account. Using the equivalent circuit, the mode conversion between common-mode...
Electrostatic charge measurements are at the base of chemical, physical and biological experiments. In this work the authors present an electrometer based on the vibrating capacitance of a microelectromechanical (MEMS) micromachined resonator. We present improvements on the low-noise readout amplifier by reducing input-referred voltage noise and parasitic capacitances. An amplifier has been designed...
In this paper, a novel compensation method, Dynamic Stage Element Matching (DSEM), is introduced. This paper provides a comparison of existing error compensation methods and DSEM. DSEM extends Dynamic Element Matching (DEM) of Digital to Analog Converters (DAC) to entire stages of a pipeline ADC. Results show that the use of DSEM, when used in conjunction with Capacitor Swapping (CS) and DEM, increases...
In this paper we present the design and implementation of a low power neural amplifier which has two programmable gains in two programmable bandwidths. The bandwidths are programmable between 0.7–300Hz, suitable for measuring local field potentials and 1.95–5.4kHz, suitable for measuring action potentials. The amplifier achieves a maximum gain of 79dB in the higher bandwidth. A chip has been designed...
A fully differential front-end circuit for a neural recording system with spike and Local Field Potential (LFP) separation by means of switched capacitor (SC) filters is reported in this paper. In many neural recording chips the transmitter is the most power hungry element and defines the number of channels on a chip. With a separation of the neural signal, it is possible to reduce the data rate and...
This paper presents a design and measurements of multichannel integrated circuits dedicated to recording of neurobiological signals. 64 recording channels have been implemented in a single chip using a commercially available CMOS 180 nm process. A single recording amplifier consumes only 25 µW from 1.8 V supply and occupies 0.13 mm2 of the silicon area. Its main parameters such as the low/high cut...
Power supply noise has become one of the main performance-limiting factors in sub-1V technologies. Resonant supply noise caused by the package/bonding inductance and on-die capacitance has been reported as the dominant supply noise component in high performance microprocessors. Resonant noise frequency typically resides in the 40MHz to 300MHz frequency band but can be made as low as 7MHz with a dedicated...
A low power CMOS latched comparator has been designed in TSMC 0.18um employ neutralization technique for reducing Kickback Noise. The simulation results demonstrate that it can work at 1GHz suitable for high speed applications. Measurement results prove that the latched comparator consumes 246uW with a power supply of 1.2v at 10MHz. A simulation method for accurately determining dynamic offset in...
In this paper, an ultra-low power 12-bit 2 kS/s successive approximation register (SAR) analog-to-digital converter (ADC) is presented. For power optimization, the voltage supply of the digital part is lowered, and the offset voltage of the latch is self-calibrated. Targeted for lower noise, a low kick-back noise latch is proposed. The chip was fabricated using 0.18 μm 1P6M CMOS technology. The ADC...
There is a growing demand for low-noise, small-size and programmable biopotential acquisition systems. A crucial circuit block is the high-gain amplifier which also constitutes the interface to the patient. We propose a low-power and low-noise front-end with configurable gain for recording of signals such as the electroneurogram (ENG) or electromyogram (EMG). The proposed circuit consists of an input...
In this paper, we report on the noise analysis of low current measurement systems for biomedical applications. We analyzed resistive feedback, capacitive feedback and current conveyor circuits for low current measurement systems. Detailed noise analysis are presented and matched with measurement data using a 0.5-μm fabrication process. Based on the theoretical analysis and the measurements, the capacitive...
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