Peak detector
AssigneeTexas Instruments Incorporated
InventorsMarius Vicentiu Dina, Susan Ann Thompson
Life of this patent
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Abstract
A circuit includes a peak detector, a diode, a dynamic clamp circuit, and an offset correction circuit. The peak detector generates a voltage on the peak detector output proportional to a lowest voltage on the peak defector input. The anode of the diode is coupled to the peak detector input. The dynamic clamp circuit is coupled to the peak detector input and is configured to clamp a voltage on the peak detector input responsive to a voltage on the diode's anode being greater than the lowest voltage on the peak detector's input. The offset correction circuit is coupled to the peak detector output and is configured to generate an output signal whose amplitude is offset from an amplitude of the peak detector output.
Claims15
A circuit, comprising:
- a diode having an anode and a cathode;
- a first transistor having a first control input coupled to the anode of the diode;
- a first current source having a first terminal coupled to a voltage supply(VS a first resistor coupled between the first current source and the first transistor;
- a second transistor having a second control input;
- a second resistor coupled between the second terminal of the first current source and the second transistor;
- a capacitor coupled between the voltage supply and the second control input;
- a second current source coupled between the power supply node and the second control input;
- and
- a third transistor coupled between the second control input and a ground terminal.
A system, comprising:
- a laser diode;
- and
- a laser driver adapted to be coupled to the laser diode, the laser driver comprising:
- a peak detector circuit including a peak detector input and a peak detector output, the peak detector configured to provide a voltage on the peak detector output proportional to a lowest voltage on the peak detector input;
- a diode including a cathode and an anode, the anode coupled to the peak detector input;
- a dynamic clamp circuit coupled to the peak detector input, the dynamic clamp circuit configured to clamp a voltage on the peak detector input responsive to a voltage on the anode being greater than the lowest voltage on the peak detector input;
- and
- an offset correction circuit coupled to the peak detector output, wherein the offset correction circuit is configured to generate a signal at the offset voltage output whose magnitude is offset from a voltage at the anode of the diode.
Dependencies are inferred from the claim text.