Magnetic read apparatus having an improved read sensor isolation circuit
A method and system provide a magnetic read apparatus. The magnetic read apparatus includes a substrate and an isolation circuit. The isolation circuit includes a bias resistor and a capacitor residing on the substrate. The bias resistor and the capacitor are connected in parallel through the substrate.
1. A magnetic read apparatus comprising:
a substrate; and
an isolation circuit including a bias resistor and a capacitor residing on the substrate, the bias resistor including a first end and a second end, the capacitor including a first plate, a second plate and an insulator between the first plate and the second plate, the first end being connected to the first plate by at least one conductive line, the second end being connected to the second plate through the substrate and free of another conductive line connecting the second end to the second plate such that the bias resistor and the capacitor are connected in parallel through the substrate.
2. The magnetic read apparatus of claim 1 wherein the substrate includes a ground pad and a bias connection pad, the bias resistor and the capacitor being connected in parallel to the ground pad and the bias connection pad.
3. The magnetic read apparatus of claim 2 wherein the second plate is electrically connected to a pad through the substrate, the pad being selected from the ground pad and the bias connection pad.
4. The magnetic read apparatus of claim 3 wherein the capacitor is coupled to the bias connection pad through the substrate.
5. The magnetic read apparatus of claim 3 wherein the capacitor is coupled to the ground pad through the substrate.
6. The magnetic read apparatus of claim 1 wherein the substrate is a slider.
7. The magnetic read apparatus of claim 2 further comprising:
a read sensor connected to the ground pad and the isolation circuit such that the read sensor is isolated from the bias connection pad.
8. The magnetic read apparatus of claim 1 wherein the isolation circuit has an impedance of not more than ten Ohms at a frequency of at least one hundred MHz and not more than ten GHz.
9. The magnetic read apparatus of claim 1 wherein the isolation circuit has an impedance of not more than ten Ohms at a frequency of at least nine hundred MHz and not more than five GHz.
10. The magnetic read apparatus of claim 1 wherein the second end is connected to the second plate only through the substrate such that the bias resistor and the capacitor are connected in parallel through the substrate.
11. A magnetic read apparatus comprising:
a slider including a ground pad and a bias connection pad;
an isolation circuit including a bias resistor and a capacitor residing on the slider, the bias resistor including a first end and a second end, the second end of the bias resistor being connected to the ground pad, the first end of bias resistor being connected to the bias connection pad, the capacitor having a first plate, a second plate and an insulating layer between the first plate and the second plate, the first plate being electrically connected to the bias connection pad through the slider and free of another conductive line connecting the first plate to the bias connection pad, the second plate being directly connected to the ground pad by at least one conductive line such that the bias resistor and the capacitor are connected in parallel through the slider; and
a read sensor connected to the ground pad in parallel with the isolation circuit;
wherein the isolation circuit had an impedance of not more than ten Ohms at a frequency of at least one hundred MHz and not more than ten GHz.
12. A method for providing a magnetic read apparatus comprising:
providing an isolation circuit including a bias resistor and a capacitor residing on a substrate, an isolation circuit including a bias resistor and a capacitor residing on the substrate, the bias resistor including a first end and a second end, the capacitor including a first plate, a second plate and an insulator between the first plate and the second plate, the first end being connected to the first plate by at least one conductive line, the second end being connected to the second plate through the substrate and free of another conductive line connecting the second end to the second plate such that the bias resistor and the capacitor are connected in parallel through the substrate.
13. The method of claim 12 further comprising:
forming a ground pad on the substrate; and
providing a bias connection pad on the substrate, the bias resistor and the capacitor being connected in parallel to the ground pad and the bias connection pad.
14. The method of claim 13 wherein the pad is selected from the ground pad and the bias connection pad.
15. The method of claim 14 wherein the capacitor is coupled to the bias connection pad through the substrate.
16. The method of claim 12 wherein the substrate is a slider.
17. The method of claim 13 further comprising:
providing a read sensor connected to the ground pad and the isolation circuit such that the read sensor is isolated from the bias connection pad.
18. The method of claim 12 wherein the isolation circuit has an impedance of not more than ten Ohms at a frequency of at least one hundred MHz and not more than ten GHz.