CIRCUIT AND METHOD FOR GENERATING OSCILLATING SIGNALS

摘要

An oscillator module includes a first MOS transistor and a capacitor. The capacitor is coupled between a gate and source of the first MOS transistor. The drain of the first MOS transistor receives a first bias current and generates an oscillating output signal. A switching circuit operates in response to the oscillating output signal to selective charge and discharge the capacitor. A current sourcing circuit is configured to generate the bias current. The current sourcing circuit includes a second MOS transistor which has an identical layout to the first MOS transistor and receives a second bias current. A resistor is coupled between a gate and source of the second MOS transistor. The current sourcing circuit further includes a current mirror having an input configured to receive a reference current passing through the resistor and generate the first and second bias currents.

主权项

1. A circuit, comprising:
an oscillator module, comprising:
a first MOS transistor having a gate, a source coupled to a reference voltage, and a drain coupled to a first trigger node of the oscillator module, the first transistor configured to generate an oscillating output signal of the oscillator module by being alternately turned on and off, anda first capacitor coupled between the gate and the source of the first MOS transistor and configured to be alternately charged or discharged in response to the oscillating output signal to turn the first MOS transistor on and off, and a current source configured to control a current flowing through the first MOS transistor so that a voltage between the drain and the source of the first MOS transistor is no greater than a first value when the first MOS transistor is turned on.