Automatic level control
First Claim
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1. A circuit comprising:
- a high voltage transistor providing a resistance;
an amplifier configured to receive a current and to convert the current to a first voltage that is used in a loop creating the current; and
an automatic level control circuit that, based on an AC amplitude of the first voltage, adjusts a second voltage at a gate of the high voltage transistor and thereby adjusts the resistance and the first voltage;
wherein the automatic level control circuit is configured to adjust the first voltage toward the first reference voltage if the first voltage differs from a first reference voltage.
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Abstract
Some embodiments regard a circuit comprising: a high voltage transistor providing a resistance; an amplifier configured to receive a current and to convert the current to a first voltage that is used in a loop creating the current; and an automatic level control circuit that, based on an AC amplitude of the first voltage, adjusts a second voltage at a gate of the high voltage transistor and thereby adjusts the resistance and the first voltage; wherein the automatic level control circuit is configured to adjust the first voltage toward the first reference voltage if the first voltage differs from a first reference voltage.
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Citations
18 Claims
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1. A circuit comprising:
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a high voltage transistor providing a resistance; an amplifier configured to receive a current and to convert the current to a first voltage that is used in a loop creating the current; and an automatic level control circuit that, based on an AC amplitude of the first voltage, adjusts a second voltage at a gate of the high voltage transistor and thereby adjusts the resistance and the first voltage; wherein the automatic level control circuit is configured to adjust the first voltage toward the first reference voltage if the first voltage differs from a first reference voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method comprising:
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converting a current provided by a microelectromechanical structure to a first voltage;
an amplitude of the first voltage being proportional to an amplitude of the current;providing a second voltage;
an amplitude of the second voltage is proportional to the amplitude of the first voltage;based on the amplitude of the second voltage with reference to a first reference voltage and a second reference voltage, adjusting a voltage level of a third voltage, thereby adjusting the amplitude of the first voltage and of the second voltage; wherein if the amplitude of the second voltage is lower than the first reference voltage then adjusting the voltage level of the third voltage such that the amplitude of the second voltage changes toward the first reference voltage and if the amplitude of the second voltage is higher than the second reference voltage then adjusting the voltage level of the third voltage such that the amplitude of the second voltage changes toward the second reference voltage. - View Dependent Claims (15, 16, 17, 18)
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Specification