The invention discloses a triangular
phase modulation wave driving apparatus for
closed loop feedback control of a
fiber-optic
gyroscope. The apparatus is used for achieving the
closed loop feedback control of the
fiber-optic
gyroscope. In the technical scheme, on the basis of a conventional
sawtooth wave phase modulation method, the apparatus is modified so as to solve a problem caused by flashback of
voltage during restoration time of the
sawtooth wave. The improved design is described as follows: by means of difference characteristics and symmetry of DAC and a
driving circuit, two paths ofdifferential
triangular wave, which are symmetrical about 0V, are generated by the DAC and the
driving circuit; by controlling two paths of analogue switches, the
signal channels of the two paths of triangular
waves are switched with each other at the vertexes, so that the two paths of differential triangular
waves are spliced to form two paths of differential sawtooth
waves. The
sawtooth wave, when being applied to two electrodes of Y
waveguide, has equivalent effect as directly-outputted sawtooth wave in a conventional scheme. After bias modulation is overlapped, the
closed loop feedback control of the
fiber-optic
gyroscope is achieved.