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Optical reading head sampling interface system

An optical reading head and interface technology, which is applied in the direction of transducer head devices, data recording, instruments, etc., can solve the problems of signal noise reduction, attenuation of reading voltage, etc.

Inactive Publication Date: 2007-10-03
TIAN HLDG LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the voltage divider circuit not only attenuates the programming voltage that is not sampled, but also attenuates the reading voltage to be sampled.
If the attenuated reading voltage is mixed with the noise at the back end, the signal-to-noise ratio SNR will decrease, and the two resistors will occupy a considerable area on the chip

Method used

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  • Optical reading head sampling interface system
  • Optical reading head sampling interface system
  • Optical reading head sampling interface system

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Embodiment Construction

[0052] The schematic diagram used in the present invention is described in detail as follows. When describing the embodiment of the present invention in detail, the structure diagram showing the sampling interface circuit of the optical pickup head will not be partially enlarged according to the general scale for the convenience of explanation, but it should not be used as a limited understanding. Know.

[0053] Referring to FIG. 2, in one embodiment, the voltage input 201 outputs a voltage from the optical pickup head 180, which can be at least a reading voltage (about 1.4 to 2.8 volts) or a programming voltage (about 3.3 to 5 volts), And a switch circuit (represented by an N-type metal oxide semiconductor transistor 202 in FIG. 2 ) is used as the first path circuit, placed between the optical pickup head 180 and the switching operational amplifier 203, for receiving the chip reading voltage or burning Voltage. The above-mentioned programming voltage and chip reading voltage...

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Abstract

The invention is a sampling interface system of optical read head, containing: an optical read head to output a disc read voltage or a burn voltage, and a switching circuit containing an n-type metal-oxide semiconductor (NMOS) that has a first source / drain to receive the disc read voltage to the burn voltage and a grid to receive a grid voltage, and as receiving the read voltage, it makes the first and second sources / drains of the NMOS in a turn-on state, but as receiving the burn voltage, makes them in a cut-off state. And finally it connects a sample-hold circuit to the second source / drain of the NMOS to sample and hold the disc read voltage.

Description

technical field [0001] The invention relates to an interface circuit system, in particular to a sampling interface circuit, which provides a signal sampling and holding function between chips or circuits with different operating voltages, and can protect lower working voltages during high-voltage operation. voltage chip or circuit. Background technique [0002] When a signal is transmitted from a higher working voltage circuit to a lower working voltage circuit, there must be an interface circuit between the two circuits to attenuate the signal to the tolerance range of the lower working voltage circuit. For example, the operating voltage of the general optical pickup head is 5 volts, and the operating voltage of the optical drive control chip is 3.3 volts. If the programming voltage (Writing Voltage 3.3 volts to 5 volts) output by the optical pickup head is directly input to the optical drive control chip, the oxide layer of the 3.3 volt process at the input end of the opt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B21/00
Inventor 刘智民
Owner TIAN HLDG LLC