US 12,483,201 B1
Parametric-insensitive edge rate control in switched-power circuits with tailored power supply voltage sensitivity
Nishant Jain, Austin, TX (US); and Vamsikrishna Parupalli, Austin, TX (US)
Assigned to CIRRUS LOGIC, INC., Austin, TX (US)
Filed by CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTD., Edinburgh (GB)
Filed on Nov. 8, 2022, as Appl. No. 17/982,826.
Int. Cl. H03F 3/217 (2006.01); H03F 1/02 (2006.01); H03F 1/30 (2006.01); H03F 3/24 (2006.01)
CPC H03F 1/303 (2013.01) [H03F 1/0222 (2013.01); H03F 3/245 (2013.01); H03F 2200/114 (2013.01); H03F 2200/27 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A circuit for generating a reference output current having a controlled dependence on a power supply voltage, the circuit comprising:
a first current reference supplied by the power supply voltage that generates a first output current that is independent of a variation of the power supply voltage and dependent on process and temperature variations;
a second current reference supplied by the power supply voltage that generates a second output current that is dependent on the variation of the power supply voltage and dependent on the process and the temperature variations; and
a reference output circuit that generates the reference output current from the first and the second output current with a controlled output characteristic so that a first slope of a variation of the reference output current with respect to the power supply voltage over a first portion of a range of variation of the power supply voltage has a direction opposite a second slope of the variation of the reference output current with respect to the power supply voltage over a second portion of the range of variation of the power supply voltage.