Optical disk pickup using current mode signal exchanges and systems and methods using the same
AssigneeCirrus Logic, Inc.
InventorsDavid Michael Pietruszynski, Rex Baird
Life of this patent
Estimating the term…
Abstract
An optical disk pickup system includes an array of photodiodes 101 for converting photons reflected from an optical disk into a plurality of electrical signals each representing a channel. Driving circuitry 407, 408 drives at least one of the electrical signals as a current across a conductor of a flexible cable 403. A low impedance load 404 converts the electrical signal driven across the conductor as a current into a voltage for further processing.
Claims14
An optical disk pickup system comprising:
- a photodiode for converting a plurality of photons reflected from an optical disk to a current;
- a current multiplier for increasing the current from the photodiode to drive a conductor;
- and
- low impedance load disposed in receiving circuitry coupled to the conductor for reconverting the current driven on the conductor into a voltage.
An optical disk pickup system comprising:
- a photodiode for converting a plurality of photons reflected from an optical disk to a current;
- a current multiplier for increasing the current from the photodiode to drive a conductor;
- and
- a summer for summing the current from the transconductance amplifier with two or more currents generated from the output of two or more photodiodes.
An optical disk pickup system comprising:
- a photodiode for converting a plurality of photons reflected from an optical disk to a current;
- and
- a current multiplier for increasing the current from the photodiode to drive a conductor, wherein the current multiplier comprises a transimpedance amplifier for converting the current from the photodiode to a voltage and a transconductance amplifier for driving the conductor with a current generated from the voltage output of the transimpedance amplifier.
An optical disk system comprising:
- n array of a plurality of photodiodes for converting photons reflected from an optical disk into a plurality of electrical signals each representing a channel;
- circuitry for driving at least one of said electrical signals as a current across a conductor of a flexible cable;
- and
- a low impedance load for converting the electrical signal driven across the conductor as a current into a voltage.
A method of transmitting signals from an optical pickup to processing circuitry via a flexible cable comprising the steps of:
- converting photons reflected from an optical disk into an electrical signal;
- driving the electrical signal as a current across a conductor of the flexible cable;
- and
- converting the electrical signal driven across the conductor as a current into a voltage using a low impedance load.
Dependencies are inferred from the claim text.