Abstract
A process-voltage-temperature (PVT)-robust, low power, low noise, and high sensitivity, super-regenerative (SR) receiver is proposed in this paper. To enable high sensitivity and robust-PVT operation, a fast locking phase-locked-loop (PLL) with initial random phase error reduction is proposed to continuously adjust the center frequency deviations of the SR oscillator (SRO) without interrupting the input data stream. Additionally, a concurrent quenching waveform (CQW) technique is devised to improve the SRO sensitivity and its noise performance. The proposed SRO architecture is controlled by two separate biasing branches to extend the sensitivity accumulation (SA) phase and reduce its noise during the SR phase, compared to the conventional optimal quenching waveform (OQW). The proposed SR receiver is implemented at 2.46 GHz center frequency in 180 nm SMIC CMOS technology and achieves better sensitivity, power consumption, noise performance, and PVT immunity compared with existent SR receiver architectures.
Highlights
The low complexity and low power consumption characteristics make super-regenerative (SR)receivers, mainly composed of a LC-tank super regenerative oscillator (SRO), an envelope detector (ED), and a demodulator, a suitable alternative for short-range wireless communications
All of them are infeasible to conduct background frequency calibration as the reason are several methods currently used to calibrate the oscillating frequency of the SRO using PLL [4,5]
Where ∆φi (n) is the initial phase error in the cycle n, ∆τUP,DW (n) is the pulse width of phase-frequency detector (PFD)’s outputs; ICP is the current of the charge pump; C1 is the capacitance of C1; and k is the voltage-to-frequency gain of SRO, fSRO is the oscillating frequency of SRO while fo is its initial value
Summary
The low complexity and low power consumption characteristics make super-regenerative (SR). Any deviation in the center frequency or the shape of its quenching waveform will result in selectivity and sensitivity degradations. That offers the proposed calibration the capability capability to to SROcontinuously center frequency in every quenching cycle to compensate for the selectivity deviation during continuously adjust adjust the the SRO. A concurrent quenching optimize the sensitivity of the into two regions, namely optimize the sensitivity of the SRO This quenching signal places the SRO into two regions, namely waveform (CQW)accumulation technique is (SA). This paper is organized as follows: Section 2 firstly presents the SRO theoretical background analysis and important design parameters, and introduces the proposed background frequency calibration and concurrent quenching waveform techniques. This paper is organized as follows: Section 2 firstly presents the SRO theoretical background proposed background frequency calibration and concurrent quenching waveform techniques.
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