High-drive CMOS current amplifier
IEEE Journal of Solid-State Circuits, ISSN: 0018-9200, Vol: 33, Issue: 2, Page: 228-236
1998
- 39Citations
- 26Captures
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Article Description
A high-performance current amplifier is proposed which is based on a folded-cascode transresistance amplifier and a low-distortion class AB current output stage. The loop gain of the transresistance amplifier exhibits a gain bandwidth product of 10 MHz and a dc gain as high as 100 dB which allows accurate closed-loop operations to be achieved. Despite the intrinsic low-linearity performance of current amplifiers with respect to their voltage amplifier counterpart, the proposed circuit provides an output current of 7 mA with a total harmonic distortion (THD) better than -55 dB while requiring only 200 μA of quiescent current for the output transistors. The circuit was fabricated in a 1.2-μm CMOS process, uses a 5-V power supply, and dissipates 4 mW.
Bibliographic Details
Institute of Electrical and Electronics Engineers (IEEE)
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