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US 7,403,064 B2Granted
Dynamically accelerated operational amplifier and method thereof
AssigneeRealtek Semiconductor Corp.
InventorsGerchih Chou, Chia-Liang Lin, Ming-Je Tsai
Life of this patent
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Abstract
An operational amplifier is dynamically accelerated depending on its internal state. Acceleration is disabled when the internal state indicates a risk of instability. When the internal state of the operational amplifier indicates no risk of instability, the acceleration is turned on to speed up the circuit operation.
Claims19
An operational amplifier comprising:
- an adjustable core circuit comprising at least two amplification stages and at least two configurations of different driving capabilities, and
- an acceleration controller receiving at least a voltage signal of a node within said adjustable core circuit and generating a control signal to select one of said configurations;
- wherein the acceleration controller comprises at least one comparator for receiving the voltage signal and generating a comparator output signal, and the acceleration controller generates the control signal based on the comparator output signal.
An operational amplifier comprising:
- an adjustable core circuit comprising at least two amplification stages and at least two configurations of different driving capabilities, and
- an acceleration controller receiving at least a voltage signal of a node within said adjustable core circuit and generating a control signal to select one of said configurations;
- wherein the accelerator controller comprises at least one comparator for receiving the voltage signal and generating a comparator output signal, a timer circuit for generating a logical signal, and a finite state machine (FSM) for receiving the comparator output signal and the logical signal and generating the control signal to select one of said configurations.
A method of controlling an operational amplifier having at least two configurations of different driving capabilities, the method comprising:
- receiving at least a voltage signal of a node within the operational amplifier;
- detecting the internal state of the operational amplifier based on the voltage signal;
- and
- selecting a configuration according to the detected internal state;
- wherein said configurations include at least a normal mode and an accelerated mode, where the accelerated mode provides higher driving capability than the normal mode;
- wherein the step of detecting further comprises using at least one comparator to determine the range of the voltage signal.
3 more elements
Dependencies are inferred from the claim text.