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Electric vehicles have been around for more than a century. Heavy, ugly, slow, expensive, with short range and short life, they have been limited to golf carts and forklifts. From grocery getters to Formula One cars, pistons and gears have been the hot technology. That's about to change. Advances in battery technology, control and power electronics make electric drive the hot technology now. From...
Welcome to CICC 2010, our 32nd annual Custom Integrated Circuits Conference - the Showcase for Circuit Design in the Heart of Silicon Valley. This year, our Technical Program Committee of over 80 experts has delivered all you have come to expect from CICC, and more. We continue our strong tradition of education with three full tracks of Education Sessions. As was introduced last year, we offer a pair...
We present asymmetric SRAM cell design approaches to improve Read stability over conventional symmetric SRAM Cell. We show that selective threshold voltage control is more effective than adjusting transistor size for read stability improvement in an asymmetric SRAM cell. We implement statistical DC noise margin monitors and present the hardware measurement data as well as the DC/AC simulation data...
Digital push-pull impedance-modulating (RM) pre-emphasis driver overcomes the power overhead of equalization in voltage-mode (VM) drivers, improving the output stage efficiency ~2-3x. A compact, fully-digital RAM-DAC implementation with pattern lookup compensates both duty-cycle distortion and driver nonlinearity, while providing a programmable pre-emphasis. A testchip fabricated in 90nm CMOS process...
This paper presents a multi-MHz buck regulator for portable applications using an auto-selectable peak- and valley-current control (ASPVCC) scheme. The proposed ASPVCC scheme and the dynamically-biased shunt feedback in the current sensors relax the settling-time requirement of the current sensing and improve the sensing speed. The proposed converter can thus operate at high switching frequencies...
In this paper, a 0.18-V input three-stage charge pump circuit applying forward body bias is proposed. In the developed charge pump, all the MOSFETs are forward body biased by using the inter-stage/output voltages. By applying the proposed charge pump as the startup in the boost converter, the lower kick-up input voltage of the boost converter can be achieved. To verify the circuit characteristics,...
A flash LED Buck-Boost driver employs a dual duty cycle control and feed-forward duty cycle correction to achieve high efficiency over the entire Li-On battery voltage range of 3.0 to 5.2V. Fabricated in a 0.5μm CMOS process, the converter uses an external 1μH inductor and a 10μF capacitor and operates at 2MHz switching frequency. The measured peak efficiency is 83% and 87% at 1.2A and 0.6A LED currents,...
Balancing the execution times of concurrent tasks in a multi-core processor is critical to achieving good performance scaling with increasing core count. However, this is difficult when the tasks' execution times are not known in advance. In this work, we propose an intelligent Network-on-Chip that performs bandwidth regulation using weighted round robin packet arbitration to balance the execution...
An interpolative-phase-tuning technique is presented to tune the frequency of millimeter-wave LC-based ring oscillators without using varactors. Two oscillator prototypes are designed and implemented in a 0.13-μm CMOS process. The first oscillator operates at 50GHz with 8 output phases and measures phase noise of -127.8dBc/Hz at 10MHz offset, tuning range of 6.8%, and figure of merit (FOM) of 186...
A 2 × 2 array of Schottky-barrier diode detectors with an on-chip patch antenna and a preamplifier is fabricated in a 130-nm logic CMOS process. Each detector cell can detect the 25-kHz modulated 280-GHz radiation signal with a measured responsivity and noise equivalent power (NEP) of 21kV/W and 360pW/√Hz, respectively. At 4-MHz modulation frequency, NEP should be about 40pW/√Hz. At supply voltage...
A 60-GHz injection-locked frequency divider (ILFD) fabricated in 65nm CMOS and operating at 1.2V consumes 1.65mW excluding buffers and biasing circuits, and has a measured locking range of 48.5-62.9GHz (25.9%) with 0dBm input power. The core ILFD area is 0.0157mm2. The large locking range is attributed to the use of the multi-order LC oscillator topology.
An integrated high-sensitivity CMOS MEMS capacitive accelerometer with thermal stability has been designed and demonstrated in this work. Issue of obtaining stable DC bias at input terminals is particularly addressed. Sensitivity of 595 mV/g is achieved in the accelerometer and the overall noise floor is 50 μg/√Hz, which corresponds to an effective capacitance noise floor of 0.024 aF/√Hz. The zero-g...
This paper shows that due to their negligibly low leakage, in certain applications, chips utilizing power gates built even with today's relatively large, high-voltage micro-electro-mechanical (MEM) relays can achieve lower total energy than those built with CMOS transistors. A simple analysis provides design guidelines for off-time and savings estimates as a function of technology parameters, and...
A 7-bit switched capacitor D/A converter (DAC) is built using only n-channel amorphous silicon (a-Si:H) thin film transistors (TFT) and capacitors. The circuit is built on both plastic and glass using a low temperature process, compatible with flexible plastic substrates. The measurements show excellent characteristics, achieving a DNL of less than ±0.6 LSB and INL of less than ±1 LSB without calibration,...
This paper presents an energy-efficient SoC dedicated for portable medical monitoring and intervention systems capable of closed-loop control. The SoC contains a 0.9V/165μW MCU and a dual-band RF block including a 403MHz transceiver for data link and a 915MHz receiver for wake-up link. The data link transceiver is composed of a 200kbps FSK transmitter and a 64kbps OOK receiver, consuming 5.58mW and...
A signal-agnostic compressed sensing (CS) acquisition system is presented that addresses both the energy and telemetry bandwidth constraints of wireless sensors. The CS system enables continuous data acquisition and compression that are suitable for a variety of biophysical signals. A hardware efficient realization of the CS sampling demonstrates data compression up to 40x on an EEG signal while maintaining...
The critical issues in charge-based touch screen panels for large size display are noise and speed. To solve these, this paper introduces a two-point relative sensing based `Delta-Integration' scheme. It eliminates local noise and increases a readout difference between the touched and non-touched area. As a result, it can replace a high-resolution ADC with a comparator and counter. In addition, the...
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