Patent ID: 9553545
Date: 2017-01-24
CPC Classifications: H03B

Claim:
1. A differential crystal oscillator circuit, comprising: a crystal, coupled between a first terminal and a second terminal, to generate an oscillating signal; a first transistor including a drain coupled to the first terminal, a gate coupled to the second terminal, and a source coupled to a supply voltage; a second transistor including a drain coupled to the second terminal, a gate coupled to the first terminal, and a source coupled to the supply voltage; a first super diode coupled between the first terminal and the supply voltage, the first super diode including a first transconductance (Gm) amplifier coupled to a first diode-connected transistor; and a second super diode coupled between the second terminal and the supply voltage, the second super diode including a second Gm amplifier coupled to a second diode-connected transistor.