Patent ID: 11901865
Assignee: STMICROELECTRONICS INTERNATIONAL N.V.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A low power crystal oscillator circuit, comprising:
a crystal;
a high power supply;
a low power supply;
a first capacitor coupled to the crystal and coupled to the low power supply;
a first current mirror transistor coupled to the high power supply and, the first current mirror transistor having a channel with a first width to length ratio;
a first current source outputting current of a first value, the first current source coupled to the first current mirror transistor and coupled to the low power supply;
a second current mirror transistor coupled to the high power supply and the first current mirror transistor, the second current mirror transistor having a second width to length ratio that is X times greater than the first width to length ratio;
a first startup control transistor coupled to the second current mirror transistor and coupled to the crystal;
a third current mirror transistor coupled to the high power supply, the third current mirror transistor having a third width to length ratio; and
a second current source coupled to the third current mirror transistor and the low power supply.