Marvell International Limited

Marvellworld Trade Ltd.

Tritech Microelectronics International Ltd.

Sang Kong Chan

Xiao Yu Miao

Bin Jiang

Thart Fah Voo

Ah Siah Chua

Kien Beng Tan

Chong Lim Neoh

Maisy Mun Ng

A system including transmission lines, read elements, and differential amplifiers. The read elements are connected in series. Each of the read elements is connected to a respective pair of the transmission lines. The differential amplifiers are connected respectively to the read elements via the transmission lines. The differential amplifiers are configured to amplify differential signals received from the respective pairs of the transmission lines.

Two-dimensional magnetic recording systems and methods for minimizing and accounting for inter-modulation of signals induced in adjacent read elements

A system including a first transmission line, a second transmission line, a first element, a second element and a differential amplifier. The first element is configured to read a storage media to generate a read signal, where the first element is connected to the first transmission line. The second element is configured to detect interference and generate an interference signal, where the second element is connected to the second transmission line. The differential amplifier includes a first input and a second input, where the first input of the differential amplifier is connected to a the first transmission line and receives the read signal, and where the second input of the differential amplifier is connected to the second transmission line and receives the interference signal.

Pseudo-differential magnetic recording system and method incorporating a dummy read element and a dummy transmission line

An interface driver circuit includes a plurality of delay cells. Each delay cell includes a data input, a delayed data output configured to communicate with the data input of an adjacent one of the plurality of delay cells. A delay time input is configured to set a delay value between receiving data at the data input and generating the delayed data output. A plurality of predrivers is configured to receive an output enable signal. A plurality of predrivers is configured to receive a corresponding one of the plurality of delayed data outputs. A plurality of predrivers is configured to generate a predriver output signal based on the output enable signal and the corresponding one of the plurality of delayed data outputs. The output enable signal enables and disables the plurality of predrivers and is independent of data of each delayed data output.

Slew rate control circuit for small computer system interface (SCSI) differential driver

A circuit is adapted to activate a writer head of a data storage media drive during both the boost periods as well as the steady state periods. The current supplied to the writer head during the boost periods exceeds the steady state current and flows between positive and negative voltage supplies so as to provide the required magnetic flux change in the inductor disposed in the write head. During the steady state periods, a switch circuit is turned on to provide a second current path across the writer head. During the steady state periods, the current flows between the positive voltage supply and the ground to reduce power consumption. The switch circuit is turned off during the boost periods.

Low power preamplifier writer architecture

An interface driver circuit comprises N cascaded delay cells, each including a data bit input, a delayed data bit output that communicates with the data bit input of an adjacent one of the N cascaded delay cells, and a delay time input that sets delay values between receiving data at the data bit input and generating the delayed data bit output. N predrivers receive an output enable signal that is independent of the data, receive a corresponding one of the N delayed data bit outputs and generate a predriver output signal based on the output enable signal and the corresponding one of the N delayed data bit outputs.

A small computer system interface (SCSI) driver circuit having a programmable slew rate comprises N cascaded delay cells each including a data bit input, a delayed data bit output that communicates with the data bit input of an adjacent one of the N cascaded delay cells, and a delay time input that receives a programmable delay time value for setting a variable delay between receiving data at the data bit input and generating the delayed data bit output. N predrivers receive an output enable signal and a corresponding one of the N delayed data bit outputs and generate a predriver output signal based on the output enable and the corresponding one of the N delayed data bit outputs. N drivers have inputs that receive predriver output signals from corresponding ones of the N predrivers. An output port communicates with outputs of the N drivers.

A digital tablet of the type that multiplexes pen position signals has filtering and digitizing circuits arranged in separate channels for each of the signals that is to be multiplexed. The tablet pen is connected to receive an oscillator signal and the signal is picked up at each of the four corners of the tablet and applied to the corresponding channel. The separate channels permit the filters to be made sharper. The disclosure also includes improved circuits for processing the pen position signals.

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Singapore, Singapore

Sang Kong Chan