Design of a high performance, low power, fully differential telescopic cascode amplifier using common-mode feedback circuit
Summary :
Table of Contents
- Abstract
- Introduction
- Design methodology
- Estimating design parameters
- Generating biases
- Sensing the common mode level (VCM)
- Auxiliary amplifier
- Return mechanism
- Results of design methodology
- Conclusion
- Bibliography
Abstract
high gain differential amplifier is ubiquitous in today's analog circuits owing to its improved immunity to noise, larger output swings and reduced distortion. In particular, an amplifier with high speed and low power dissipation has high utility in various applications like ADCs and DACs. However, the design of a fully differential telescopic amplifier is complicated as the DC level of its output is not well defined.
One of the reasons for this is the current mismatch [1] between p-channel and n-channel MOSFET's used in the amplifier. To solve this problem and to clearly define the DC common mode level at the output node a CMFB circuit is inevitably needed.
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