LOW-POWER BALANCED CRYSTAL OSCILLATOR

摘要

A circuit includes: first and second output terminals; a reference resonator coupled between the first and second output terminals; a cross-coupled oscillation unit coupled to the first and second output terminals; a first MOSFET diode coupled to the cross-coupled oscillation unit, the first MOSFET diode including a first transistor, a first resistor coupled between gate and drain terminals of the first transistor, and a first capacitor; a second MOSFET diode coupled to the cross-coupled oscillation unit, the second MOSFET diode including a second transistor, a second resistor coupled between gate and drain terminals of the second transistor, and a second capacitor cross coupled between the drain terminal of the second transistor and the gate terminal of the first transistor, wherein the first capacitor is cross coupled between the drain terminal of the first transistor and the gate terminal of the second transistor.

主权项

1. A circuit, comprising:
first and second output terminals; a reference resonator coupled between the first and second output terminals; a cross-coupled oscillation unit coupled to the first and second output terminals; a first metal-oxide semiconductor field-effect transistor (MOSFET) diode coupled in series to the cross-coupled oscillation unit at the first output terminal, the first MOSFET diode including a first transistor, a first resistor coupled between gate and drain terminals of the first transistor, and a first capacitor; a second MOSFET diode coupled in series to the cross-coupled oscillation unit at the second output terminal, the second MOSFET diode including a second transistor, a second resistor coupled between gate and drain terminals of the second transistor, and a second capacitor cross coupled between the drain terminal of the second transistor and the gate terminal of the first transistor, wherein the first capacitor is cross coupled between the drain terminal of the first transistor and the gate terminal of the second transistor; wherein the cross-coupled oscillation unit further comprises:
third and fourth transistors cross-coupled to the first and second output terminals;a third capacitor cross coupled between a drain terminal of the third transistor and a gate terminal of the fourth transistor; anda fourth capacitor cross coupled between a drain terminal of the fourth transistor and a gate terminal of the third transistor; and a bias insertion node coupled between the gate terminals of the third and fourth transistors of the cross-coupled oscillation unit.