High Speed Illumination Driver for TOF Applications
AssigneeTexas Instruments Incorporated
InventorJagannathan Venkataraman
Life of this patent
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Abstract
The disclosure provides a circuit. The circuit includes an amplifier and a digital to analog converter (DAC). The amplifier receives a reference voltage at an input node of the amplifier. The DAC is coupled to the amplifier through a refresh switch. The DAC includes one or more current elements. Each current element of the one or more current elements receives a clock. The DAC includes one or more switches corresponding to the one or more current elements. A feedback switch is coupled between the one or more switches and a feedback node of the amplifier. The DAC provides a feedback voltage at the feedback node of the amplifier.
Claims21
1-20. (canceled)
A circuit comprising a digital to analog converter (DAC), the DAC comprising:
- one or more current elements, each current element of the one or more current elements configured to receive a clock;
- and
- one or more switches corresponding to the one or more current elements, wherein a set of current elements of the one or more current elements are activated based on a DAC input and the clock, and a set of switches of the one or more switches are activated based on the DAC input.
A method comprising:
- activating a feedback switch;
- inactivating a refresh switch;
- activating a set of current elements of one or more current elements based on a DAC input and when a clock is at logic high;
- activating a corresponding set of switches of a one or more switches based on the set of current elements activated;
- and
- measuring a feedback voltage from a current through a resistor in each current element of the set of current elements.
A time-of-flight (TOF) system comprising a circuit, the circuit configured to transmit light pulses, the circuit includes a digital to analog converter (DAC), the DAC comprising:
- one or more current elements configured to receive a DAC input, each current element of the one or more current elements configured to receive a clock;
- and
- one or more switches corresponding to the one or more current elements, wherein a set of current elements of the one or more current elements are activated based on the DAC input and the clock, and a set of switches of the one or more switches are activated based on the DAC input.
Dependencies are inferred from the claim text.