Abstract: According to an embodiment, a linear voltage regulator is proposed. The regulator includes a voltage source circuit that provides a first voltage at its output terminal. An output transistor having a control terminal is coupled to the output terminal of the voltage source circuit to receive the first voltage. A first current path terminal of the output transistor is couplable to a load and provides a regulated output voltage to the load based on the first voltage. A feedback loop circuit includes sense circuitry to sense current sourced by the output transistor. The circuitry is coupled to a second current path terminal of the output transistor, and a second transistor is configured as a current mirror with the sense circuitry. The second transistor is coupled to the load, wherein the current mirror has a ratio of 1:M, where M is a number normally greater than or equal to 1.

Abstract: A preamplifier circuit of a hard disk drive, the preamplifier circuit includes a writer circuit configured to generate a two-level current signal for driving a magnetic head of the hard disk drive. The two-level current signal includes a steady-state current and an overshoot current. The writer circuit includes a driver circuit configured to generate the overshoot current with a programmable duration. The driver circuit includes a delay circuit configured to generate a delay control signal controlling the programmable duration of the overshoot current. The writer circuit further includes a feedback circuit configured to generate an oscillation signal when coupled to the driver circuit. The oscillation signal has a frequency that corresponds to the programmable duration of the overshoot current.

Abstract: According to an embodiment, a circuit for reducing current transition times includes a pre-biased first transistor, a second transistor, and a binary-weighted capacitor network with selectively activated capacitors controlled by logic gates receiving a command signal and boost selection signals. A resistor between the transistors provides a voltage restoration path. Another embodiment includes a binary-weighted resistor network with parallel resistor paths and switches. A write driver system incorporates the boost circuits, arranged in diagonal pairs across a bridge circuit. A control circuit activates the diagonal boost circuit pairs during switching transitions of the bridge circuit, generating current pulses that combine with the main bridge current to reduce transition times at a magnetic recording head while maintaining impedance matching.

Abstract: According to an embodiment, a linear voltage regulator is proposed. The regulator includes a voltage source circuit that provides a first voltage at its output terminal. An output transistor having a control terminal is coupled to the output terminal of the voltage source circuit to receive the first voltage. A first current path terminal of the output transistor is couplable to a load and provides a regulated output voltage to the load based on the first voltage. A feedback loop circuit includes sense circuitry to sense current sourced by the output transistor. The circuitry is coupled to a second current path terminal of the output transistor, and a second transistor is configured as a current mirror with the sense circuitry. The second transistor is coupled to the load, wherein the current mirror has a ratio of 1:M, where M is a number normally greater than or equal to 1.