Ping-pong amplifier with auto-zeroing and chopping

摘要: A ping-pong amplifier employs auto-zeroing and chopping to simultaneously achieve low offset voltage frequency noise, as well energy at the frequency. The includes respective nulling amplifiers (A3, A4) for each of its gain (A1, A2), which auto-zero amplifier. In addition, switches are included allow inputs outputs active be chopped. Thus, while one is being auto-zeroed, other amplifies input signal One described embodiments circuitry reduces switching transients that might otherwise appear in amplifier's output by ensuring common-mode kept equal a reference voltage.