Solving the cable problem between crystal sensor and electronics by use of a balanced bridge oscillator circuit

Abstract

The balanced bridge oscillator circuit presented here perfectly compensates for the negative influence of the cable. The oscillator circuit is characterized by two almost equal bridge branches; the first one contains the sensor crystal connected via the sensor cable, the second one contains an identical cable terminated by a capacity equal to the resonator's static capacity C/sub 0/. The cable compensation performance of the balanced bridge oscillator has been justified by a respective circuit analysis and by measurements of its key specifications in comparison with those of a conventional oscillator.