Patent ID: 11894810
Assignee: STMICROELECTRONICS S.R.L.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A circuit for sensing and controlling a fly height of a tip in a hard disk drive comprising the circuit, an input of the circuit coupled to a sense resistor at a first sense terminal and a second sense terminal, the circuit comprising:
a first amplifier circuit comprising a first transistor, a first load resistor, a first capacitor, a first control circuit, and a first current generator, the first control circuit configured to selectively apply a negative bias voltage supply to the first transistor; and
a second amplifier circuit comprising a second transistor, a second load resistor, a second capacitor, and a second current generator,
wherein each of the first amplifier circuit and the second amplifier circuit is configured to:
receive input signals from the sense resistor, and
amplify the input signals in accordance with a variation in resistance at the sense resistor.