US 12,170,527 B2
High linearity resistive digital-to-analog converters with dynamic control for temperature and voltage invariant on-resistance of switches
Fu-Tai An, San Jose, CA (US); Mariam Hoseini, San Jose, CA (US); and Jan-Harm Nieland, Santa Clara, CA (US)
Assigned to Infinera Corporation, San Jose, CA (US)
Filed by Infinera Corporation, San Jose, CA (US)
Filed on Jun. 28, 2022, as Appl. No. 17/852,312.
Claims priority of provisional application 63/215,808, filed on Jun. 28, 2021.
Prior Publication US 2022/0416805 A1, Dec. 29, 2022
Int. Cl. H03M 1/78 (2006.01); H03M 1/76 (2006.01)
CPC H03M 1/785 (2013.01) [H03M 1/76 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A digital-to-analog converter (DAC) circuit, comprising:
a resistor ladder including a plurality of stages, one of the stages including a first resistor and a second resistor;
a switch including a third transistor coupled to one of the first and second resistors; and
a control circuit operable to adjust an on-resistance of the transistor, such that a sum of the resistances of the first and second resistors and the on resistance is equal to a predetermined amount,
wherein the switch includes the first transistor, the control circuit including the second transistor, such that the third resistor is connected in series with the second resistor, the third resistor having a resistance corresponding to a resistance of the first resistor.