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Other Parts Discussed in Thread: OPA1622, TIPD177

Is there additional care to be taken while obtaining balanced output from OPA1622 (using two op-amps)?

  • Hello Chethan,

    I recommend taking a look at TIPD177. Section 2.3 in the document discusses the theory of a difference amplifier used to convert a differential signal to a single-ended signal.

    -Tim Claycomb
  • Chethan,

    A major consideration in balanced output (bridge-tied loads) is stability because the amplifier output effectively sees half the load impedance (e.g. double the capacitance). It's important to do a full stability analysis of each amplifier by breaking the feedback loop and checking the phase margin with an equivalent load impedance. As Tim mentioned, in TIPD177 I showed a network which mimics the high frequency behavior of a headphone (assuming this is a balanced headphone amplifier application) but a 400 pF capacitor is also a simple way to represent the impedance of headphones at high frequency.