A MOS temperature compensation function generator for TCXO using differential MOS multipliers

The temperature compensated crystal oscillator (TCXO) is widely used as a stable frequency source of mobile communication equipment. A TCXO is composed of a temperature sensor, compensation voltage generator and voltage controlled crystal oscillator. The compensation function generator is a key component of a TCXO. In this paper, we have proposed a new MOS temperature compensation function generator using analog MOS multipliers. We have evaluated the performance of the proposed compensation function generator by ADS simulation. Simulation showed that the compensation function generator had very small temperature dependence itself and it could generate cubic function of temperature.