Resistance-variation-tolerant constant-power heating circuit for integrated sensor applications

Sunny S W Chan, Philip Ching Ho Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

17 Citations (Scopus)


We report a novel CMOS circuit that is capable of maintaining constant heating power when heater resistance varies. This type of constant-power heater circuit finds application in various types of thermal-based sensors, such as vacuum sensors, ac power meters, gas-flow sensors, and gas-detection sensors. The heating power is kept constant by controlling a reference current. The circuit uses a bipolar-like translinear loop. To our knowledge, this is the first reported translinear loop implemented in CMOS. The prototype is implemented using a MOSIS 2-μm ORBIT n-well CMOS process. Experimental results showed that the heating power can be maintained to 3% with ±50% variation in resistance when the heater resistance is 1 KΩ. The maximum recorded heating power is about 11 mW for Rloadof 1 KΩ.
Original languageEnglish
Pages (from-to)432-439
Number of pages8
JournalIEEE Journal of Solid-State Circuits
Issue number4
Publication statusPublished - 1 Apr 1999
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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