Digitally assisted low noise sub IV chopper less bandgap reference circuit

A method (800) for a low noise bandgap reference voltage generation comprising:

• a. powering the generator (100) by using the power source (118);
• b. performing a binary search by using the binary search module (702), comprises:
• i. waiting for a pre-defined setup time for settling of the reference signal, and setting the ith bit of the digital data;
• ii. generating the low noise bandgap reference voltage based on the digital data generated at step b(i);
• iii. comparing the low noise bandgap reference voltage generated at the step b(ii) with the reference signal comprises:
• 1. for the reference signal less than the low noise bandgap reference voltage, the ith bit of the digital data configured to be reset;
• and
• 2. for the reference signal greater than the low noise bandgap reference voltage, the ith bit of the digital data configured to be set;
• iv. comparing the place of the bit of the digital data generated at step b(iii)(2) with bit size N, comprises:
• 1. for bit place less than bit size then the binary search module (702) configured to set the bit of the bit place to a logic value one, increase the place value of the bit of the digital data by one, and repeat the step 804c;
• and
• 2. for bit place greater than bit size then the binary search module (702) configured to perform a step c;
• c. powering down the bandgap generator (102), generating a random number based on the digital data, and resetting the counter (710) to initial state;
• d. comparing the random number with the counter (710) current logic state, comprises:
• i. for the counter (710) current logic state similar to the random number then powering up the bandgap generator (102);
• and
• ii. for the counter (710) current logic state dissimilar to the random number then the counter (710) configured to change the logic state to the next logic state and the random number module (708) configured to repeat the step d;
• e. waiting for a pre-defined setup time for settling of the reference signal generated by the bandgap generator (102);
• f. generating the low noise bandgap reference voltage based on the digital data;
• and
• g. performing the linear search by using the linear search module (712), comprises:
• i. comparing the low noise bandgap reference voltage generated at the step f with the reference signal, comprises:
• 1. for the reference signal less than the low noise bandgap reference voltage then the digital logic (116) is configured to decrease the digital data by one, the digital data configured to be fed to the step c and the data converter (108d) configured to generate the low noise bandgap reference voltage based on the decreased digital data;
• 2. for the reference signal greater than the low noise bandgap reference voltage then the digital logic (116) configured to increase the digital data by one, the digital data configured to be fed to the step c, and the data converter (108d) configured to generate the low noise bandgap reference voltage based on the increased digital data;
• and
• ii. repeating the step g(i)(1) for at least two times.