ULTRA LOW NOISE DATA ACQUISITION CIRCUIT

摘要

An acquisition circuit for a vehicle or other system is provided. The system, for example, may include, but is not limited to a control moment gyroscope, and a fully differential ground isolated acquisition circuit communicatively connected to the control moment gyroscope and configured to acquire a differential data signal on the control moment gyroscope and output the differential data signal to at least one output node. The acquisition circuit may include, but is not limited to a ground reference correction circuit configured to recenter the differential data signal on at least one output node, and at least one ultra-high impedance output circuit coupled between the ground reference correction circuit and the input differential circuit.

主权项

1. A vehicle, comprising:
a control moment gyroscope comprising a rotor mounted in a gimbal; and an acquisition circuit communicatively connected to the control moment gyroscope, the acquisition circuit comprising:
a tachometer comprising at least one single-phase or multi-phase rate sensor configured to output a differential signal corresponding to an angular rate of the gimbal;an input precision divider electrically coupled to each phase of the rate sensor and configured to add gain to the differential signal corresponding to the angular rate of the gimbal;a first buffer electrically coupled to the input precision divider and configured to receive a first component of the differential signal;a second buffer electrically coupled to the input precision divider and configured to receive a second component of the differential signal;a common mode indicator circuit electrically coupled to the first buffer and the second buffer and configured to average the first component of the differential signal and the second component of the differential signal;a ground reference correction circuit electrically coupled to the common mode indicator circuit and configured to generate a ground reference correction signal based upon a comparison between the average of the first component of the differential signal and the second component of the differential signal relative to quiet ground; andan ultra-high impedance output circuit electrically coupled between the ground reference correction circuit and the first and second buffers and configured to apply the ground reference correction signal to an input of the first and second buffers substantially equally.