Biasing a differential pair in low-voltage analog circuits: a systematic approach |
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Authors: | Albert C Van Der Woerd Aarnout C Pluygers |
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Affiliation: | (1) Department of Electrical Engineering, Electronics Research Laboratory, Delft University of Technology, Mekelweg 4, 2628 CD Delft, The Netherlands |
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Abstract: | This paper deals with a systematic approach to the common mode and the differential mode biasing of a differential transistor pair. Four different variants will be shown, two of these variants show practical importance; a practical circuit of one of these variants turns out to be the traditional long-tailed pair. This variant is mainly suited, if the input signal operates at voltage level, whereas another variant has great advantages if operation at current level occurs. Besides, the latter variant turns out to be very favorable in circuits operating with a single low supply voltage. Two practical circuits based on this variant are given. |
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