Published in Analog Integrated Circuits and Signal Processing
An integrated 1–;2 GHz GaAs MESFET direct conversionI/Q-modulator and a power amplifier operating at a supply voltage of 3 Vhave been designed and fabricated. The core of the I/Q-modulator, a 90°phase shifter, is realized with a 2-section 4-phase RC-filter. TheI/Q-modulator converts a baseband signal directly to the 1.1–;2.0 GHzRF frequency. Withou...
Published in Analog Integrated Circuits and Signal Processing
In this paper a low voltage low power current-mode continuous-timelow-pass filter is presented. The current-integrator is constructedof a multi-output linearized transconductance element drivenby a balanced transimpedance amplifier. A 1 MHz third order ellipticlow pass filter is designed and fabricated with the proposedcurrent-mode integrator. The ...
Published in Analog Integrated Circuits and Signal Processing
Two integrated direct I/Q modulators suitable for directupconversion with an output frequency of 950 MHz and baseband frequencies of60 to 500 kHz are fabricated in a 1.2 µm and 0.8 µm BiCMOSprocess, respectively, and their performance under various operatingconditions is discussed. The modulators use different phase shiftertopologies, one of which ...
Published in Analog Integrated Circuits and Signal Processing
A 12-bit video speed pipelined switched capacitor analog-to-digitalconverter (ADC) has been implemented in a 0.5 µmstandard CMOS process. It operates from a single 2.6–;3.3Vsupply, dissipates 23mA (independent of supply voltage) at 20MSPS and occupies only 1.1mm 2. A 61dB SINAD (fin = 4.5 MHz) and an effective resolution bandwidthof 9 MHz is achiev...
Published in Analog Integrated Circuits and Signal Processing
The main features of two time-to-digital convertersbased on interpolation are presented, together with some measurementresults. The first converter is based on digital delay line interpolatorsand has been implemented in a 1.2 µm CMOS process.It has a single-shot resolution of 1 ns (σ-value)and a nonlinearity less than ±50 ps in the measurementrange...
Published in Analog Integrated Circuits and Signal Processing
A 1.6 GHz fully monolithic silicon bipolar LC current-controlledoscillator (CCO) circuit implemented in a 0.8 µmBiCMOS technology and characterized for use in wireless applicationsis presented. The integrated resonator circuit uses high speed(18 GHz) bipolar transistors, a 14 nH rectangular spiral inductorfabricated by using a standard 2-level meta...
Published in Analog Integrated Circuits and Signal Processing
An 8-bit, 200 MSPS folding and interpolating analog-to-digitalconverter, ADC, has been implemented in a 1.2 µmBiCMOS-process. It achieves 7.5 effective bits with a power dissipationof 575mW. The active area is 4mm2. The implementationand measured results are presented. A simple analytical modelfor the interpolation-induced nonlinearity in a folding...
Published in Analog Integrated Circuits and Signal Processing
10 dB gain−, 15 GHz-Bandwidth amplifier has been designed andfabricated in InP-HBT technology. Operation of the amplifier was achieved at1.7 V at total current consumption of 40 mA. The amplifier designed to havea Bessel-transfer-function has almost constant group delay up to 30 GHz.Pulse- and eye-diagram- measurements have been performed to verify...
Published in Analog Integrated Circuits and Signal Processing
We have designed, processed and tested monolithic 40GHzfrequency doublers and amplifiers using enhancement and depletionHEMT processes. The passive parts included microstrip, coplanarwaveguide and lumped component circuits. The on-chip measuredoutput power of frequency doublers at 40GHz was +2dBm and the conversion loss was 2–;5 dB. The EHEMT doubl...
Published in Analog Integrated Circuits and Signal Processing
Future integrated microsystems will benefit significantlyfrom progress in the VLSI field. Two key elements will boostthe implementation of new micro-integrated architectures: progressin batch-manufactured silicon sensors and the introduction ofnew circuit techniques for designing interface circuits. Thesetwo factors will be essential in favoring th...
