US 12,334,869 B2
Enabling an external resistor for an oscillator
Nitin Agarwal, Bangalore (IN); Aniruddha Roy, Bangalore (IN); and Preetham Narayana Reddy, Bangalore (IN)
Assigned to Texas Instruments Incorporated, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Dec. 18, 2023, as Appl. No. 18/542,861.
Application 18/542,861 is a continuation of application No. 17/509,706, filed on Oct. 25, 2021, granted, now 11,848,645.
Prior Publication US 2024/0120882 A1, Apr. 11, 2024
Int. Cl. H03K 3/0231 (2006.01); H03B 5/20 (2006.01); H03B 5/24 (2006.01)
CPC H03B 5/20 (2013.01) [H03B 5/24 (2013.01); H03K 3/0231 (2013.01); H03B 2200/0014 (2013.01); H03B 2200/0034 (2013.01); H03B 2200/0038 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A device comprising:
an integrated circuit chip that includes:
a pin;
a current mirror that includes a first output and a second output;
a transistor coupled to the first output of the current mirror;
a first resistor coupled between the transistor and the pin;
a first switch coupled between the second output of the current mirror and a node;
a second switch coupled between the node and a ground node;
a variable resistor coupled to the node;
a capacitor coupled between the variable resistor and the ground node;
a comparator coupled to the node;
a phase generator coupled to the comparator that includes:
a first output configured to provide a first phase signal; and
a second output configured to provide a second phase signal; and
a selection circuit that includes:
a first input coupled to the node;
a second input coupled to the first output of the phase generator; and
a third input coupled to the second output of the phase generator.