US 12,074,569 B2
Reducing startup time in a crystal oscillator
Animesh Paul, Bangalore (IN)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by Texas Instruments Incorporated, Dallas, TX (US)
Filed on Nov. 30, 2022, as Appl. No. 18/072,682.
Prior Publication US 2024/0178794 A1, May 30, 2024
Int. Cl. H03B 5/36 (2006.01)
CPC H03B 5/36 (2013.01) 19 Claims
OG exemplary drawing
 
1. An oscillator apparatus, comprising:
a first input adapted to be coupled to a first terminal of a crystal oscillator;
a second input adapted to be coupled to a second terminal of the crystal oscillator;
a transconductance circuit comprising a transistor having a source, drain, and gate;
a first resistor coupled between a third input coupled to the gate, and the source;
a second resistor coupled between the third input and the drain;
a first switch coupled between the first input and the second input; and
a second switch coupled between the transconductance circuit and the second input.