The digital trimming Electric Erase Programmable Read Only Memory (EEPROM) circuit is designed in the Temperature Compensated Crystal Oscillator (TCXO).It has the operational mode and three test modes-RAM WRITE
EEPROM WRITE and EEPROM READ
used for trimming the analog compensation voltage in the TCXO.The circuit is simulated and validated in 0.35 μm SMIC technology with HSPICE
and the results show it has high reliability and low power consumption.