A circuit combines the features of fast startup with low current, low frequency response, and low noise. With the use of a novel biasing technique, it is possible to operate the piezoelectric crystal at zero DC voltage bias, both throughout the startup phase and during normal operation, by setting both ends of the piezoelectric crystal to the same voltage potential. In this application, the potential is that of the reference voltage. Not having to charge the piezoelectric crystal capacitance reduces the startup time dramatically.