| Citation: |
Yao Zhijian, Ma Chengyan, Ye Tianchun, Mo Taishan. Design and Analysis of a Gain-Enhanced, Fully Differential Telescopic Operational Transconductance Amplifier[J]. Journal of Semiconductors, 2008, In Press.
Yao Z J, Ma C Y, Ye T C, Mo T S. Design and Analysis of a Gain-Enhanced, Fully Differential Telescopic Operational Transconductance Amplifier[J]. J. Semicond., 2008, 29(2): 269.
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Design and Analysis of a Gain-Enhanced, Fully Differential Telescopic Operational Transconductance Amplifier
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Abstract
This paper describes the design and analysis of a fully differential, gain-enhanced CMOS telescopic operational transconductance amplifier (OTA) used in a pipeline analog-to-digital converter (ADC).Specifications of the OTA are derived from the requirements of ADC.Simulation shows that for a 1pF load capacitance, this OTA achieves a high DC gain (approximately 145dB) and a wide unity-gain bandwidth (above 750MHz) at a phase margin 58°.In a configuration where the closed loop-gain is 4, the design spends about 18ns for settling with 0.05% accuracy.Simulations of this design are performed in SMIC CMOS 0.18μm technology.-
Keywords:
- OTA,
- gain-boost,
- CMFB
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References
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