Abstract
A fourth-order single-bit delta-sigma modulator is presented for sensor applications. The loop filter is composed of both feedback and feedforward paths, and the modulator is implemented using fully differential switched-capacitor techniques. A test chip was fabricated in a 0.18-mum standard complementary metal-oxide semiconductor (CMOS) process. The chip core area is 1.22 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , and its power consumption is 5.6 mW from a 3.0-V power supply. Measurement results show that a maximum 99-dB dynamic range is achievable at a clock rate of 3.2 MHz for the 20-kHz bandwidth. The designed chip is targeted for high-accuracy and wide-bandwidth sensor applications such as the resistor-based current sensors and the Hall-effect sensors in motor control systems.
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