Methods and apparatus to adjust linear redriver devices
AssigneeTexas Instruments Incorporated
InventorsMustafa U. Erdogan, Douglas Edward Wente, Amit Rane
Life of this patent
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Abstract
An example apparatus includes: variable gain amplifier (VGA) circuitry having: an input terminal, an output terminal, and a control terminal; and peak detector circuitry having: an input terminal coupled to the output terminal of the VGA circuitry; an output terminal coupled to the control terminal of the VGA circuitry; the peak detector circuitry configured to: compare a voltage on the output of the VGA circuitry to an offset voltage; and adjust, responsive to the comparison, a gain of the VGA circuitry.
Claims20
A redriver device comprising:
- variable gain amplifier (VGA) circuitry having an input terminal, an output terminal, and a control terminal;
- and
- peak detector circuitry having an input terminal coupled to the output terminal of the VGA circuitry, an output terminal coupled to the control terminal of the VGA circuitry wherein the peak detector circuitry includes:
- digital to analog converter (DAC) circuitry having an input terminal, and an output terminal, the DAC circuitry configured to generate an offset voltage;
- comparator circuitry having a first input terminal coupled to the output terminal of the VGA circuitry, a second input terminal coupled to the output terminal of the DAC circuitry, and an output terminal, the comparator circuitry configured to compare a voltage on the output terminal of the VGA circuitry to the offset voltage;
- and
- programmable circuitry configured to adjust, responsive to the comparison, a gain of the VGA circuitry.
A redriver device comprising:
- equalizer circuitry having an input terminal configured to receive an input signal, an output terminal, and a control terminal;
- variable gain amplifier (VGA) circuitry having an input terminal coupled to the output terminal of the equalizer circuitry, an output terminal, and a control terminal;
- transmitter driver circuitry having:
- an input terminal coupled to the output terminal of the VGA circuitry, an output terminal provided to transmit an output signal;
- and
- peak detector circuitry having a second input terminal coupled to the output terminal of the transmitter driver circuitry, an output terminal coupled to the control terminal of the VGA circuitry, wherein the peak detector circuitry is configured to:
- compare a voltage on the output terminal of the VGA circuitry to an offset voltage;
- and
- adjust, responsive to the comparison, a gain value of the VGA circuitry.
Programmable circuitry comprising:
- counter circuitry configured to generate a counter value responsive to a comparison between an output voltage produced by a redriver circuit and an offset voltage;
- and
- a Finite State Machine (FSM) configured to adjust a gain of VGA circuitry responsive to the counter value.
Dependencies are inferred from the claim text.