Clearance sensor and circuitry using adjustable channel parameters

An apparatus, comprising:

• a transducer configured to interact with a magnetic storage medium and comprising a plurality of bond pads, each of the bond pads serving as a voltage or current source contact;
• a first sensor having a temperature coefficient of resistance and comprising a first end and a second end, the first end coupled to a first bond pad and the second end coupled to ground;
• a second sensor having a temperature coefficient of resistance and comprising a first end and a second end, the first end of the second sensor coupled to a second bond pad and the second end of the second sensor coupled to ground;
• and
• preamplifier circuitry comprising first channel circuitry coupled to the first sensor and second channel circuitry coupled to the second sensor, the first channel circuitry configured to provide adjustment of a plurality of first channel parameters and the second channel circuitry configured to provide adjustment of a plurality of second channel parameters, the first and second channel parameters independently adjustable by the first and second circuitry;
• and
• a detector coupled to the preamplifier circuitry and configured to detect one or more head-medium interface events.

A method, comprising:

• sensing a first head-medium interface signal with a first thermal sensor coupled to a first channel;
• sensing a second head-medium interface signal with a second sensor coupled to a second channel;
• adjusting first parameters of the first channel;
• adjusting second parameters of the second channel independently of adjusting the first parameters;
• and
• detecting a head-medium interface event using the first and second head-medium interface signals.