Impulse sensitivity function-based phase noise study for low-power source-coupled CMOS multivibrators

Abstract

In this paper, two micropower frequency references implemented with a 0.13-and a 0.25-lm CMOS process for low-power sensor applications are presented. Both circuits are based on a power-optimized source-coupled CMOS multivibrator. The 2.0-MHz frequency reference uses a nominal 1.8-2.5-V supply voltage. The 24.6/ 307.2-kHz frequency reference is an evolution of the 2.0-MHz reference and operates with a lower supply of 1.0 V and provides two active operating modes. With 1-pF load capacitances, the 2.0-MHz and 24.6/307.2-kHz frequency references typically consume 6.7 lA and 230/750 nA, respectively. After presenting experimental results relating to frequency trimming and frequency stability, this paper concentrates on the phase noise study of the proposed frequency references. The procedure used to apply the impulse sensitivity function-based (ISF) phase noise method to CMOS oscillators is described in detail. The phase noise results of both the implemented references obtained with this method agree well with the measurements.

Comparative Analyses of Phase Noise in 28 nm CMOS LC Oscillator Circuit Topologies: Hartley, Colpitts, and Common-Source Cross-Coupled Differential Pair

“…A detailed procedure for computation of the ISF and PN prediction in a linear time-varying system in the case of a source-coupled CMOS multivibrator with operating frequency up to 2 MHz was presented in [ 25 ]. All the results were achieved only for a single amplitude value of the injected pulse.…”

Phase Noise comparative analysis of LC oscillators in 28-nm CMOS through the Impulse Sensitivity Function

“…The ISF of the oscillators has been evaluated as described in [14]. First we run a transient simulation in order to observe when the amplitude reaches the steady state regime.…”

“…A detailed procedure for ISF computation and phase noise prediction in a linear time-varying system, in particular a source-coupled CMOS multi-vibrator frequency reference up to 2 ΜHz is presented in [14]. All the results however, are derived only for a single amplitude value of an injected pulse.…”

CMOS Wireless Hybrid Transceiver Powered by Integrated Photodiodes for Ultra-Low-Power IoT Applications

“…Compared to traditional designs, this approach provides At the center of the DCO is the core oscillator, which is a relaxation oscillator that generates two clock frequencies: 1 MHz and 1.1 MHz. It provides high-frequency output waveforms with low power consumption [34]. In Figure 8, a digital block in the black dashed circle inset configures the reference current for the two different DCO frequencies according to the modulation modes used.…”