Time filter

Source Type

Austin, TX, United States

Kurchuk M.,Columbia University | Weltin-Wu C.,Silicon Labs | Morche D.,CEA Grenoble | Tsividis Y.,Columbia University
IEEE Journal of Solid-State Circuits | Year: 2012

Presented is a clockless, continuous-time (CT) GHz processor that bypasses some of the limitations of conventional digital and analog implementations. Per-edge digital signal encoding is used for parallel processing of continuous-time samples with a temporal spacing as narrow as 15 ps, generated by a 3-b CT flash ADC. Parallel digital delay chains and programmable charge pumps realize the asynchronous filtering operation, each consuming negligible power while awaiting a new sample. A six-tap CT ADC and CT digital FIR processor system occupies 0.07 mm 2 and achieves dynamic range of over 20 dB in the 0.8-3.2-GHz signal range. The system's rate of operations automatically adapts to the signal, thus causing its power dissipation to vary in the range of 1.1 to 10 mW according to input activity. © 2012 IEEE. Source

Schulz E.,Silicon Labs
Electronic Products (Garden City, New York) | Year: 2010

The use of one-time programmable (OTP) MCU enables engineers to reduce the cost of their embedded systems without influencing the system performance. OTP-based MCU use a bit-cell memory where each bit can be modified once. A single byte in the device's code memory could be modified up to eight times by clearing one bit per write instruction. An external programming voltage needs to be applied for the duration of the programming process and must be removed when the sequence is complete. Several OTP devices are capable of in-application programming (IAP), where the MCU can write to code space through firmware without requiring an external programming voltage. Silicon laboratories offer several OTP device categories which range in size, performance, and package type and provide combinations of the peripherals and functions such as system management bus (SMBus) and a universal asynchronous receiver/transmitter (UART) and temperature sensor and voltage reference. Source

McGlothlin R.,Silicon Labs
Electronic Products | Year: 2015

There are many applications where it is very useful to make analog measurements between separate power domains. In each case, power buses sitting at fairly high voltage must be monitored and controlled. The device used for controlling these systems typically sits in a much lower power domain and all measurements must be isolated. One way to make an isolated analog measurement is to use a current transfer optocoupler. Current transfer optocouplers are prone to instability over time and temperature, making it hard to maintain accuracy in critical systems. There are three common ways of taking precision measurements across power domains. Using a simple analog circuit and a digital isolator is one of them. People can also use a standalone A/D converter for conversion to digital and pair that with a digital isolator. We can also use one of the many analog amplifiers integrated with isolation that are now available. Source

Ouzillou M.,Silicon Labs | Yu R.,Dust Networks
Microwave Journal | Year: 2014

There are three key factors an engineer must consider in a wearable design. These are power consumption across all modes of operation, proper RF design from the matching circuits to the antenna(s) and the integration level of the devices used in the design. Most wireless wearable devices share common components including a battery, an antenna, a microcontroller (MCU), a radio and a sensor. When selecting the best WMCU for their application, engineers should look for lowest active power consumption (EM0), lowest standby currents (EM1 and EM2), and choice of microprocessor cores including 8 and 32-bit ARM Cortex. When designing a wireless wearable device that is as energy friendly as possible, one must ferret out every possible optimization of power consumption. When a device wakes up, it must do so as quickly as possible, collect and process data as quickly as possible and go back to sleep as quickly as possible. To reduce power consumption and die cost, wireless MCU ICs integrate only one receive path. So antenna diversity must be performed through an external switch that alternately selects between the two antennas. The adoption of Time Synchronized Channel Hopping (TSCH) into relevant standards will continue to encourage far-reaching adoption. Source

Weltin-Wu C.,Silicon Labs | Weltin-Wu C.,Columbia University | Tsividis Y.,Columbia University
IEEE Journal of Solid-State Circuits | Year: 2013

This paper presents a clock-less 8b ADC in 130 nm CMOS technology, which uses signal-dependent sampling rate and adaptive resolution through a time-varying comparison window, for applications with sparse input signals. Input-dependent dynamic bias is used to reduce comparator delay dispersion, thus helping to maintain SNDR while saving power. Alias-free operation with SNDR in the range of 47-54 dB, which partly exceeds the theoretical limit of 8b conventional converters, is achieved over a 20 kHz bandwidth with 3-9 μW power from a 0.8 V supply. © 1966-2012 IEEE. Source

Discover hidden collaborations