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Optical micrograph of the completed five-stage ring oscillator with output buffer on glass substrate. The channel ratio of pentacene TFTs is ten times larger than that of TFTs.
Transfer characteristics (red lines) and the square root of drain current vs gate voltage (blue lines) of (a) the pentacene TFT with a channel ratio of 10 and (b) the TFT with a channel ratio of 1.
Voltage transfer curve (red circles) of the hybrid complementary inverter at and gain characteristic (blue circles) showing an excellent logic conservation and a high gain value of 56.
(a) Output characteristics of the five-stage ring oscillator at different . (b) Plots of oscillation frequencies (red circles) and corresponding signal delays per stage (blue circles) as a function of . The inset is a symbolic representation of the circuit.
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