Inkjet-printed high speed polymeric complementary circuits are fabricated using an n-type ([poly{[N,N'-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5'-(2,2'-dithiophene)} [P(NDI2OD-T2), Polyera ActivInk N2200] and two p-type polymers [poly(3-hexylthiophene) (P3HT) and a dithiophene-based polymer (Polyera ActivInk P2100)]. The top-gate/bottom-contact (TG/BC) organic field-effect transistors (OFETs) exhibit well-balanced and very-high hole and electron mobilities (mu(FET)) of 0.2-0.5 cm(2)/Vs, which were enabled by optimization of the inkjet-printed active features, small contact resistance both of electron and hole injections, and effective control over gate dielectrics and its orthogonal solvent effect (selection of poly(methyl methacrylate) and 2-ethoxyethanol). Our first demonstrated inkjet-printed polymeric complementary devices have been integrated to high-performance complementary inverters (gain >30) and ring oscillators (oscillation frequency similar to 50 kHz). We believe that the operating frequency of printable organic circuits can be further improved more than 10 MHz by fine-tuning of the device architecture and optimization of the p- and n-channel semiconductor processing. (C) 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 49: 62-67, 2011