Patent ID: 11863360
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A system comprising:
a level shifting circuit configured to generate a digital output based on a digital input, wherein voltage level of the digital output is shifter from voltage level of the digital input; and
an on-off keying (OOK) modulator coupled to the level shifting circuit, circuit and comprising:
a first transistor having a first terminal and a second terminal, wherein the first terminal is coupled to a first bias voltage;
a second transistor having a third terminal and a fourth terminal, wherein the third terminal is coupled to a second bias voltage; and
a third transistor having a control terminal coupled to the second terminal of the first transistor and the fourth terminal of the second transistor, wherein
the OOK modulator configured to:
turn on the first transistor to apply the first bias voltage to the control terminal of the third transistor in response to a first state of the digital output;
turn on the second transistor to apply the second bias voltage to the control terminal of the third transistor in response to a second state of the digital output which is opposite to the first state;
generate a current through the third transistor based on the voltage applied to the control terminal of the third transistor; and
generate a modulated carrier signal based on an output of an oscillator and the current through the third transistor.