US 12,470,137 B2
Negative voltage generator
Ashutosh Kumar, Patna (IN); Abhishek Jain, Delhi (IN); Suraj Somashekara Kumar, Bantwal Taluk (IN); Ramesh G. Karpur, Bangalore (IN); Ashutosh Ravindra Joharapurkar, Bangalore (IN); Zhemin Zhang, Allen, TX (US); Yalong Li, Allen, TX (US); Rohan Samsi, Milpitas, CA (US); and Marco A. Zuniga, Berkeley, CA (US)
Assigned to Infineon Technologies Canada Inc., Ottawa (CA)
Filed by Infineon Technologies Canada Inc., Ottawa (CA)
Filed on Oct. 24, 2023, as Appl. No. 18/493,640.
Prior Publication US 2025/0132668 A1, Apr. 24, 2025
Int. Cl. H02M 3/07 (2006.01); H03K 3/0231 (2006.01); H03K 3/03 (2006.01)
CPC H02M 3/071 (2021.05) [H03K 3/0231 (2013.01); H03K 3/03 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A circuit configured to generate a negative voltage on a negative voltage supply node, the circuit comprising:
an oscillator;
a negative voltage generation circuit configured to respond to receiving a signal received from the oscillator by generating a negative voltage on the negative voltage supply node, wherein the negative voltage generation circuit operates at an operating frequency that depends at least on the frequency of the signal generated by the oscillator negative voltage is a function of a frequency of the signal received from the oscillator; and
an oscillator control signal generator configured to sense the negative voltage present on the negative voltage supply node, and in response to the sensing, control the frequency of the signal generated by the oscillator to thereby control the operating frequency of the negative voltage generator, the oscillator control signal generator comprising:
a comparator comprising:
a positive input node;
a negative comparator input node connected to a reference voltage source that provides a positive reference voltage, and
an output node connected to the oscillator; and
a level shifter connected between the negative voltage supply node and the positive input node of the comparator, the level shifter being configured to output a shifted voltage that is a positive voltage and a constant voltage above the negative voltage on the negative voltage supply node.