Clockless, Continuous-Time Analog Correlator Using Time-Encoded Signal Processing Demonstrating Asynchronous CDMA for Wake-Up Receivers

被引：20

作者：

Mangal, Vivek ^{[1
]}

Kinget, Peter R. ^{[1
]}

机构：

[1] Columbia Univ, Dept Elect Engn, New York, NY 10027 USA

来源：

IEEE JOURNAL OF SOLID-STATE CIRCUITS | 2020年 / 55卷 / 08期

关键词：

Code-division multiple access (CDMA); continuous-time (CT) correlator; wake-up receiver; SYSTEMS;

D O I：

10.1109/JSSC.2020.2980526

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A clockless, continuous-time (CT) analog correlator circuit realization is presented based on time-encoded analog signal processing. Voltage-controlled oscillators (VCOs) transform the analog voltage signals into time-encoded analog signals and, in the process, perform signal integration; CT, digital-style delay cells combined with phase-frequency detectors followed by capacitive summers implement a CT matched filter. The correlator prototype designed in 65-nm CMOS-LP technology consumes 37 nW from 0.54 V and is used in the baseband of a wake-up receiver to despread asynchronous code-division multiple access (CDMA) codes and demonstrate code-domain filtering for an 11-bit Barker code. The wake-up receiver's sensitivity is enhanced by 2 dB to -80.9 dBm for a missed detection ratio of 10(-3), and its selectivity is improved by 5 dB, thanks to the use of the correlator. Simultaneous wake-up using CDMA is demonstrated with selective responses of the receiver to different desired codes in the presence of an undesired code.

引用

页码：2069 / 2081

页数：13

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