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A Level Shifter for a Bias-Offset Transconductor
Fujihiko Matsumoto,Toshio Miyazawa,Shintaro Nakamura,Yasuaki Noguchi 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
A transconductor is a fundamental building block for analog signal processing circuits, such as filters and multipliers. For such applications, the transfer characteristic of the transconductor is desired to be linear. The bias-offset transconductor is known as a linear MOS transconductor. The transconductor has floating voltage sources. This paper presents a new design of the floating voltage source. If the proposed circuit is used as a level shifter for the linear transconductor, the output DC voltage is more accurate than that of the conventional circuit. Further, the proposed circuit is used as the second signal voltage source for a multiplier, the second harmonic distortion is improved. Simulation results show those advantages.