CMOS-controlled printhead sense circuit in inkjet printer

摘要

A CMOS-controlled printhead sense circuit includes a CMOS control circuit module operable as a transmission gate switchable between first and second signal levels and a CMOS sense circuit module operable in a printhead sense mode in response to the CMOS control circuit module being switched to the first level and in a transparent mode in response to the control circuit module being switch to the second level. The CMOS control circuit module includes a combination of PMOS and NMOS FETs which define a CMOS switchable transmission gate. The CMOS sense circuit module includes a combination of PMOS and NMOS FETs which define respectively a switch device switchable between high and low states corresponding to the sense and transparent modes and a load enhancement device for the switch device.