<PAGE>
Exhibit 23.1
CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
We consent to the reference to our firm under the caption "Experts" in the
Registration Statement on Form S-3 of Applied Micro Circuits Corporation and to
the incorporation by reference therein of our report dated April 19, 2000, with
respect to the consolidated financial statements and schedule of Applied Micro
Circuits Corporation, included in its Annual Report (Form 10-K) for the fiscal
year ended March 31, 2000, filed with the Securities and Exchange Commission.
/s/ Ernst & Young LLP
San Diego, California
October 2, 2000
