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US 7,746,019 B2Granted
Servo control circuit
AssigneeChip Goal Electronics Corporation
InventorHui-Yen Hsieh
Life of this patent
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Abstract
The present invention discloses a servo control circuit comprising: a first node for receiving a control voltage; a second node for receiving a feedback voltage; an operational amplifier controlling a current on a path according to the voltages at the first and second nodes, the path including an internal voltage node thereon; an analog to digital converter (ADC) for converting the voltage at the internal voltage node to a digital signal; and a control logic circuit for generating a servo control signal according to the digital signal.
Claims8
A servo control circuit comprising:
- a first node for receiving a control voltage;
- a second node for receiving a feedback voltage;
- an operational amplifier controlling a current on a path according to the voltages at the first and second nodes, the path including an internal voltage node thereon;
- an analog to digital converter (ADC) for converting the voltage at the internal voltage node to a digital signal;
- a control logic circuit for generating a servo control signal according to the digital signal;
- and
- a current source electrically connected with the internal voltage node,
- wherein the internal voltage node is electrically connected with an external reference voltage node, and the internal voltage node receives a current from the external reference voltage node and a current from the current source.
5 more elements
A servo control circuit comprising:
- a first node for receiving a control voltage;
- a second node for receiving a feedback voltage;
- an operational amplifier controlling a current on a path according to the voltages at the first and second nodes, the path including an internal voltage node thereon;
- an analog to digital converter (ADC) for converting the voltage at the internal voltage node to a digital signal;
- and
- a control logic circuit for generating a servo control signal according to the digital signal,
- wherein the servo control circuit receives a supply voltage, and the voltage at the internal voltage node is equal to β(VCC)−α*ΔV, where ΔV is the difference between the control voltage and the feedback voltage, α and β are constants, and VCC is the supply voltage.
4 more elements
Dependencies are inferred from the claim text.