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Yang, Byung‐Do; Heo, Seo Weon
ETRI journal, October 2015, Letnik: 37, Številka: 5Journal Article
This paper proposes an accurate tunable‐gain 1/x circuit. The output voltage of the 1/x circuit is generated by using a capacitor charging time that is inversely proportional to the input voltage. The output voltage is independent of the process parameters, because the output voltage depends on the ratios of the capacitors, resistors, and current mirrors. The voltage gain of the 1/x circuit is tuned by a 10‐bit digital code. The 1/x circuit was fabricated using a 0.18 μm CMOS process. Its core area is 0.011 mm2(144μm×78μm), and it consumes 278 μW at VDD=1.8V and fCLK=1MHz. Its error is within 1.7% at VIN=0.05V to 1 V.
