Publisher DOI: 10.1109/LASCAS45839.2020.9068949
Title: A 1.9 nW Timer and Clock Generation Unit for Low Data-Rate Implantable Medical Devices
Language: English
Authors: Mendoza Ponce, Pablo Daniel  
Sayed, Gayas Mohiuddin  
Abu Saleh, Lait 
Krautschneider, Wolfgang 
Kuhl, Matthias  
Keywords: Biomedical electronics; CMOS Thyristor; Leakage currents; Ring oscillators; Timing
Issue Date: Feb-2020
Source: Latin American Symposium on Circuits and Systems, LASCAS: 9068949 (2020-02)
Abstract (english): 
This work presents a thyristor-based low power timer for wake up control of implantable monitoring devices, as well as a clock generation unit based on said approach. By using CMOS thyristors as delay elements in a ring oscillator, major drawbacks of conventional ring oscillators, such as a high stage count of inverters and capacitors with large currents flowing t o g round d uring s witching, c an b e o vercome. T his is particularly relevant for low frequency generation where these issues become even more critical in terms of power and area. Thyristors generate larger delays per stage while presenting a faster transition when switching between states, when compared to a typical CMOS inverter, an thus demand a smaller dynamic power. Timer, clock gating control and clock generation units were combined, implemented, and fabricated in 350 nm CMOS technology. The timer is able to wake up the clocking system (and hence a digital control unit) every 32.45 s with a power budget of less than 2 nW, while the clock generation unit produces a signal of 8.2 kHz.
Conference: 2020 IEEE 11th Latin American Symposium on Circuits and Systems, LASCAS 2020 
ISBN: 978-172813427-7
Institute: Integrierte Schaltungen E-9 
Document Type: Chapter/Article (Proceedings)
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