A new current-mode analog computational unit (ACU) is presented. The ACU can be digitally programmed to produce multiplying, squaring and inverse functions. The design is based on using MOSFETs operating in subthresho...
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ISBN:
(纸本)9781479947997
A new current-mode analog computational unit (ACU) is presented. The ACU can be digitally programmed to produce multiplying, squaring and inverse functions. The design is based on using MOSFETs operating in subthreshold region to achieve ultra-low power dissipation. The circuit is operated from a +/- 0.75V DC supply. The proposed circuit has been simulated using Tanner in 0.35 mu m TSMC CMOS process. Simulation results confirm the functionality of the circuit. The total power consumption is 2.3 mu W, total harmonic distortion is 1.1%, maximum nonlinearity error is 0.3% and the bandwidth is 2.3MHz.
This paper discusses the design and integrated circuit implementation of two alternative solutions for realizing an 8-bit high-speed steering-current multiplying digital-to-analog converter based on a current-source-a...
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This paper discusses the design and integrated circuit implementation of two alternative solutions for realizing an 8-bit high-speed steering-current multiplying digital-to-analog converter based on a current-source-array architecture. In the first solution, designated as voltage-controlled-current-source operation, a reference voltage is used to drive directly the gate-to-source voltage of the current-sources while in the second solution, designated as geometry-programmable-current-source operation, the current-sources are generated using a digitally programmable transistor-array. The characteristics of both solutions are discussed from the viewpoints of the accuracy and distortion introduced by the multiplying function. For demonstration purposes a prototype chip suitable for both operating modes has been fabricated in a single-poly 1.2 mu m CMOS digital technology. At 5 V supply and 13.3 mA full-scale output current, the chip dissipates about 90 mW for a sampling frequency of 50 MHz. The die area is approximately 1.75 mm(2).
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