Abstract: A novel and useful digitally intensive event-driven quasi-level crossing (quasi-LC) delta modulator analog to digital converter (ADC) with adaptive resolution (AR) for Internet of Things (IoT) wireless networks. Minimizing the average sampling rate for sparse input signals significantly reduces the power consumed in data transmission, processing, and storage. The AR quasi-LC delta modulator quantizes the residue voltage signal with a 4-bit asynchronous successive approximation register (SAR) sub-ADC, which enables a straightforward implementation of LC and AR algorithms in the digital domain. The modulator achieves data compression by means of a globally signal dependent average sampling rate and achieves AR through a digital multilevel comparison window that overcomes the tradeoff between the dynamic range and the input bandwidth in conventional LC ADCs. Engaging the AR algorithm reduces the average sampling rate by a factor of three at the edge of the modulator's signal bandwidth.

Abstract: A novel and useful time mode analog to digital converter (ADC) that employs injection locking to overcome the nonlinearities of the voltage controlled oscillator (VCO). The oscillator's frequency is modulated using injection locking rather than varying its supply voltage. The oscillator is injection locked with a vector modulated signal, the frequency of which is derived from the oscillator itself. The output of the oscillator is modulated by the input voltage Vin(t). The output of the modulator is at the same frequency as the oscillator with an envelope (i.e. amplitude) determined by Vin(t). This signal is injected back into the oscillator at one or more points. The frequency of the oscillator ?out(t) changes in order to satisfy the Barkhausen criteria for oscillation. Alternatively, each stage of a ring oscillator (RO) incorporates its own mixer (i.e.

Abstract: A novel and useful time mode analog to digital converter (ADC) that employs injection locking to overcome the non-linearities of the voltage controlled oscillator (VCO). The oscillator's frequency is modulated using injection locking rather than varying its supply voltage. The oscillator is injection locked with a vector modulated signal, the frequency of which is derived from the oscillator itself. The output of the oscillator is modulated by the input voltage Vin(t). The output of the modulator is at the same frequency as the oscillator with an envelope (i.e. amplitude) determined by Vin(t). This signal is injected back into the oscillator at one or more points. The frequency of the oscillator ?out(t) changes in order to satisfy the Barkhausen criteria for oscillation. Alternatively, each stage of a ring oscillator (RO) incorporates its own mixer (i.e.