Bandgap circuit for generating a reference voltage
AssigneeFeature Integration Technology Inc.
InventorTe-Hsun Huang
Life of this patent
Estimating the term…
Abstract
A circuit for providing a reference voltage that includes a chopping circuit for generating a voltage level, a converter coupled to the chopping circuit for converting an input voltage into a digital output based on the voltage level, and generating a first output in a predetermined period, and a second output in a subsequent second predetermined period, a controller for controlling the chopping circuit such that the chopping circuit generates the voltage level in a same period as the predetermined period, a first register coupled to the converter for storing the first output, a second register coupled to the converter for storing the second output, and a combiner for combining the first and the second outputs.
Claims20
A circuit for providing a reference voltage, comprising:
- a chopping circuit for generating a voltage level;
- a converter coupled to the chopping circuit for converting an input voltage into a digital output based on the voltage level, and generating a first output in a predetermined period, and a second output in a subsequent second predetermined period;
- a controller for controlling the chopping circuit such that the chopping circuit generates the voltage level in a same period as the predetermined period;
- a first register coupled to the converter for storing the first output;
- a second register coupled to the converter for storing the second output;
- and
- a combiner for combining the first and the second outputs.
A circuit for providing a reference voltage, comprising:
- a chopping circuit for generating a voltage level (V0);
- an analog-to-digital converter coupled to the chopping circuit for converting an input voltage (Vin) into a digital out based on the voltage level, and generating a first output (V1) of N bits in a first predetermined period, and a second output (V2) of N bits in a subsequent second predetermined period;
- a controller for synchronizing the chopping circuit and the converter by providing a clock to the chopping circuit and simultaneously a signal to initiate the converter such that the chopping circuit generates the voltage level in a same period as the predetermined period;
- a first register coupled to the converter for storing the first output;
- a second register coupled to the converter for storing the second output;
- and
- a combiner for combining the first and the second outputs and providing the reference voltage.
A method of providing a reference voltage, comprising:
- providing a chopping circuit;
- generating a voltage level through the chopping circuit;
- converting an input voltage into a digital form based on the voltage level;
- defining a first predetermined period;
- defining a second predetermined period;
- generating a first output of the input voltage in the first predetermined period;
- generating a second output of the input voltage in the second predetermined period;
- providing a clock to the chopping circuit;
- generating the voltage level in a same period as the first predetermined period;
- and
- combining the first and the second outputs to form the reference voltage.
Dependencies are inferred from the claim text.