Bond pad sharing for powering a multiplicity of electrical components of a recording head
A slider of a magnetic recording head comprises a plurality of electrical bond pads coupled to bias sources and a ground pad. Each of a plurality of electrical components of the slider is coupled one or more of the electrical bond pads, wherein at least one of the electrical bond pads is a shared electrical bond pad coupled to at least a first electrical component and a second electrical component. A switching transistor is coupled to the first and second components and the ground pad. The switching transistor is arranged to control powering of the second component in response to biasing of the first component.
1. An apparatus, comprising:
a slider of a magnetic recording head comprising a plurality of electrical bond pads coupled to bias sources and a ground pad;
a plurality of electrical components of the slider each coupled one or more of the electrical bond pads, wherein at least one of the electrical bond pads is a shared electrical bond pad coupled to at least a first electrical component and a second electrical component; and
a switching transistor coupled to the first and second components and the ground pad, the switching transistor arranged to control powering of the second component in response to biasing of the first component.
2. The apparatus of claim 1 , wherein the switching transistor is arranged to alternately control powering of the first and second electrical components in response to biasing of the first component.
3. The apparatus of claim 1 , wherein the switching transistor is arranged to concurrently power the first and second electrical components.
4. The apparatus of claim 1 , wherein:
the first electrical component is arranged to control switching of the transistor; and
powering of the second component is dependent on switching of the transistor by the first component.
5. The apparatus of claim 1 , wherein the switching transistor is switched between ON and OFF states in response to a change between operating modes of the recording head.
6. The apparatus of claim 5 , wherein the operating modes comprise a write mode and a read mode.
7. The apparatus of claim 1 , wherein the first electrical component comprises a thermal sensor and the second electrical component comprises a reader heater.
8. The apparatus of claim 1 , wherein the first electrical component comprises a thermal sensor and the second electrical component comprises a writer heater.
9. The apparatus of claim 1 , wherein the first electrical component comprises a reader and the second electrical component comprises a writer heater.
10. The apparatus of claim 1 , wherein at least one other electrical bond pad is a second shared electrical bond pad coupled to at least a third electrical component and a fourth electrical component, and the apparatus further comprises:
a second switching transistor coupled to the third and fourth components and the ground pad, the second switching transistor arranged to control powering of the fourth component in response to biasing of the third component.
11. The apparatus of claim 1 , wherein the recording head is configured for heat-assisted magnetic recording.
12. An apparatus, comprising:
a slider of a magnetic recording head comprising a plurality of electrical bond pads coupled to bias sources and a ground pad;
a switching transistor provided at the slider;
a first electrical component of the slider coupled between a first bond pad and a shared bond pad, the first electrical component coupled to a base of the switching transistor;
a second electrical component of the slider coupled between the shared bond pad and a collector of the switching transistor; and
an emitter of the switching transistor coupled to the ground pad.
13. The apparatus of claim 12 , wherein the switching transistor is arranged to controllably power the second electrical component in response to biasing of the first electrical component.
14. The apparatus of claim 12 , wherein the first and second electrical components are configured to be powered alternately in response to a state of the switching transistor.
15. The apparatus of claim 14 , wherein:
the first electrical component is active and the second electrical component is inactive during a write operation; and
the second electrical component is active and the first electrical component is inactive during a read operation.
16. The apparatus of claim 12 , wherein the first and second electrical components are configured to be powered concurrently in response to a state of the switching transistor.
17. The apparatus of claim 12 , wherein the first electrical component comprises a thermal sensor and the second electrical component comprises a reader heater.
18. The apparatus of claim 12 , wherein the first electrical component comprises a thermal sensor and the second electrical component comprises a writer heater.
19. The apparatus of claim 12 , wherein the first electrical component comprises a reader and the second electrical component comprises a writer heater.
20. The apparatus of claim 12 , further comprising:
a second switching transistor provided at the slider;
a third electrical component of the slider coupled between a third bond pad and a fourth shared bond pad, the third electrical component coupled to a base of the second switching transistor;
a fourth electrical component of the slider coupled between the fourth shared bond pad and a collector of the second switching transistor; and
an emitter of the second switching transistor coupled to the ground pad.