High-speed low-capacitive load common mode feedback
AssigneeTexas Instruments Incorporated
InventorsAlan I. Chaiken, Mark J. Chambers
Life of this patent
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Abstract
A variable gain amplifier to output a differential output signal includes an input circuit to input a differential input signal, a buffer circuit to buffer the differential output signal to a common mode voltage, a compensation circuit to compensate the differential output signal to prevent variation in the differential output signal, and a comparison circuit to compare the common mode voltage to a predetermined voltage and to adjust the common mode voltage to equal the predetermined voltage.
Claims9
A variable gain amplifier to output a differential output signal, comprising:
- an input circuit to input a differential input signal;
- a buffer circuit to buffer the said differential output signal to generate a common mode voltage;
- a compensation circuit to compensate said differential output signal to prevent variation in said differential output signal;
- and
- a comparison circuit to compare said common mode voltage to a predetermined voltage and to adjust said common mode voltage to equal said predetermined voltage.
A system to read and write information to a medium, comprising:
- a head to read and write said information;
- a read channel to receive said information from said head and to condition said information;
- and
- a controller to receive and transmit said information;
- wherein said read channel includes a variable gain amplifier to output a differential output signal including:
- an input circuit to input a differential input signal;
- a buffer circuit to buffer the said differential output signal to a common mode voltage;
- a compensation circuit to compensate said differential output signal to prevent variation in said differential output signal;
- and
- a comparison circuit to compare said common mode voltage to a predetermined voltage and to adjust said common mode voltage to equal said predetermined voltage.
A variable gain amplifier to output a differential output signal, comprising:
- an input circuit to input a differential input signal and a diode load to produce Vout;
- a buffer circuit to buffer the said differential output signal to generate a common mode voltage;
- a compensation circuit to compensate said differential output signal to prevent variation in said differential output signal;
- and
- a comparison circuit to compare said common mode voltage to a predetermined voltage and to adjust said common mode voltage to equal said predetermined voltage.
Dependencies are inferred from the claim text.