US 11,796,606 B2
Pin-leakage compensation scheme for external resistor-based oscillators
Aniruddha Roy, Bangalore (IN); Nitin Agarwal, 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 Oct. 25, 2021, as Appl. No. 17/509,836.
Claims priority of application No. 202141018273 (IN), filed on Apr. 20, 2021.
Prior Publication US 2022/0334196 A1, Oct. 20, 2022
Int. Cl. G01R 31/52 (2020.01); H03B 5/12 (2006.01); H03K 3/0231 (2006.01); H03K 4/502 (2006.01)
CPC G01R 31/52 (2020.01) [H03B 5/1203 (2013.01); H03K 3/0231 (2013.01); H03K 4/502 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system, comprising:
an oscillator circuit on a chip, wherein the oscillator circuit includes:
a charging current generator including a current mirror and an amplifier, wherein the amplifier is coupled to a pin on the chip, and wherein the pin is adapted to be coupled to circuitry internal to the chip and to circuitry external to the chip;
oscillator circuitry coupled to the charging current generator, wherein the oscillator circuitry includes a comparator, a phase generator, a first capacitor coupled to a first switch, and a second capacitor coupled to a second switch; and
leakage circuitry coupled to the current mirror, wherein the leakage circuitry is configured to draw a current from the current mirror proportional to a leakage current flowing through the circuitry external to the chip from the circuitry internal to the chip.