Abstract
A new bias current generator (BCG) with threshold voltage compensation for
analog circuit design implemented with low-temperature polycrystalline
silicon thin-film transistors (LT poly-Si TFTs) is proposed. The proposed
topology can be used in AMOLED display applications or in other poly-Si TFTs
current mode analog circuits. The functionality of the proposed circuit has
been verified through simulations with HSpice. In order to obtain realistic
simulations, parameters extraction in fabricated LT poly-Si TFTs was made.
The simulation results indicate that the output current is independent from
the transistors threshold voltage, without requiring additional capacitors
or control signals for the threshold voltage compensation. Furthermore, low
supply voltage is needed (10 V) and the impact of the threshold voltage
variations was reduced from 54% to 3% for an output current of 2.5 µA.
© 2010 IEEE
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