Texas Instruments Corporation

Tianyu Chang

Saurav Bandyopadhyay

Vishnu Ravinuthula

Taisuke Kazama

Huy Le Nhat Nguyen

An oscillator circuit includes a ring oscillator and a ramp generator. The ring oscillator includes a first inverter and a second inverter. The first inverter has and a first inverter input, a first inverter output, and a first power terminal. The second inverter has a second inverter input, a second inverter output, and a second power terminal. The second inverter input is coupled to the first inverter output and the second inverter output is coupled to the first inverter input. The ramp generator circuit has a ramp output coupled to the first power terminal and the second power terminal.

Oscillator circuit with open loop frequency modulation

In described examples of a ramp circuit, a first terminal of a capacitor is coupled to a ramp terminal and a second capacitor terminal is coupled to a return terminal. A charge source has an input terminal coupled to a supply terminal and a charge output terminal. A resistor has a first terminal coupled to the return terminal. A first switch is coupled between the ramp terminal and a second terminal of the resistor. A second switch is coupled between the charge output terminal and the ramp terminal.

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Tianyu Chang