Amplifier calibration

A circuit, comprising:

• an amplifier operable to receive an input signal and a feedback signal and produce an intermediate signal;
• a variable-offset circuit operable to receive the intermediate signal and produce an output signal and the feedback signal, the output signal having a DC offset that varies corresponding to a varying parameter of the variable-offset circuit, the amplifier being operable to reduce variation of the DC offset of the output signal;
• and
• a correction circuit operable to receive the output signal and produce a correction signal, the correction signal being applied to the variable-offset circuit to reduce a magnitude of the DC offset of the output signal.

A circuit, comprising:

• an amplifier operable to receive an input signal and a feedback signal and produce an intermediate signal;
• and
• a variable-offset circuit operable to receive the intermediate signal and produce an output signal and the feedback signal, the output signal having a DC offset that varies corresponding to a varying parameter of the variable-offset circuit, the amplifier being operable to reduce variation of the DC offset of the output signal;
• where
• the amplifier is a unity-gain buffer amplifier.

A circuit, comprising:

• an amplifier operable to receive an input signal and a feedback signal and produce an intermediate signal;
• and
• a variable-offset circuit operable to receive the intermediate signal and produce an output signal and the feedback signal, the output signal having a DC offset that varies corresponding to a varying parameter of the variable-offset circuit, the amplifier being operable to reduce variation of the DC offset of the output signal;
• where
• the circuit is compliant with one or more of the Institute of Electrical and Electronics Engineers;
• standards 802.11, 802.11a, 802.11b, 802.11e, 802.11g, 802.11h, 802.11i, 802.11n, and 802.16.

A circuit, comprising:

• amplifying means for receiving an input signal and a feedback signal and producing an intermediate signal;
• and
• processing means for receiving the intermediate signal and producing an output signal and the feedback signal, the output signal having a DC offset that varies corresponding to a varying parameter of the processing means, the amplifying means being operable to reduce variation of the DC offset of the output signal;
• and
• correcting means for receiving the output signal and producing a correction signal, the correction signal being used by the processing means to reduce a magnitude of the DC offset of the output signal.

A circuit, comprising:

• amplifying means for receiving an input signal and a feedback signal and producing an intermediate signal;
• and
• processing means for receiving the intermediate signal and producing an output signal and the feedback signal, the output signal having a DC offset that varies corresponding to a varying parameter of the processing means, the amplifying means being operable to reduce variation of the DC offset of the output signal;
• where
• the amplifying means is a unity-gain buffering means.

A circuit comprising:

• amplifying means for receiving an input signal and a feedback signal and producing an intermediate signal;
• and
• processing means for receiving the intermediate signal and producing an output signal and the feedback signal, the output signal having a DC offset that varies corresponding to a varying parameter of the processing means, the amplifying means being operable to reduce variation of the DC offset of the output signal;
• where
• the circuit is compliant with one or more of the Institute of Electrical and Electronics Engineers standards 802.11, 802.11a, 802.11b, 802.11e, 802.11g, 802.11h, 802,11i, 802.11n, and 802.16.

A wireless transceiver, comprising:

• a receiver operable to receive a modulated carrier signal, the receiver including,
• an amplifier operable to receive an input signal and a feedback signal and produce an intermediate signal;
• and
• a variable-offset circuit operable to receive the intermediate signal and produce an output signal and the feedback signal, the output signal having a DC offset that varies corresponding to a varying parameter of the variable-offset circuit, the amplifier being operable to reduce variation of the DC offset of the output signal by a factor that corresponds to a gain of the amplifier.

A wireless transceiver, comprising:

• a receiver operable to receive a modulated carrier signal, the receiver including,
• an amplifier operable to receive an input signal and a feedback signal and produce an intermediate signal;
• a variable-offset circuit operable to receive the intermediate signal and produce an output signal and the feedback signal, the output signal having a DC offset that varies corresponding to a varying parameter of the variable-offset circuit, the amplifier being operable to reduce variation of the DC offset of the output signal;
• and
• a correction circuit operable to receive the output signal of the variable offset circuit and produce a correction signal, the correction signal being applied to the variable-offset circuit to reduce a magnitude of the DC offset of the output signal.

A wireless transceiver, comprising:

• a receiver operable to receive a modulated carrier signal, the receiver including,
• an amplifier operable to receive an input signal and a feedback signal and produce an intermediate signal;
• and
• a variable-offset circuit operable to receive the intermediate signal and produce an output signal and the feed back signal, the output signal having a DC offset that varies corresponding to a varying parameter of the variable-offset circuit, the amplifier being operable to reduce variation of the DC offset of the output signal;
• where
• the amplifier is a unity-gain buffer amplifier.

A wireless transceiver, comprising:

• a receiver operable to receive a modulated carrier signal, the receiver including,
• an amplifier operable to receive an input signal and a feedback signal and produce an intermediate signal;
• and
• a variable-offset circuit operable to receive the intermediate signal and produce an output signal and the feed back signal, the output signal having a DC offset that varies corresponding to a varying parameter of the variable-offset circuit, the amplifier being operable to reduce variation of the DC offset of the output signal;
• where
• the wireless transceiver is compliant with one or more of the Institute of Electrical and Electronics Engineers standards 802.11, 802.11a, 802.11b, 802.11e, 802.11g, 802.11h, 802.11i, 302.11n, and 802.16.

A wireless transceiver, comprising:

• receiver means for receiving a modulated carrier signal, the receiver means including,
• amplifying means for receiving an input signal and a feedback signal and producing an intermediate signal;
• and
• processing means for receiving the intermediate signal and producing an output signal and the feedback signal, the output signal having a DC offset that varies corresponding to a varying parameter of the processing means, the amplifying means being operable to reduce variation of the DC offset of the output signal by a factor that corresponds to a gain of the amplifying means.

A wireless transceiver, comprising:

• receiver means for receiving a modulated carrier signal, the receiver means including,
• amplifying means for receiving an input signal and a feedback signal and producing an intermediate signal;
• processing means for receiving the intermediate signal and producing an output signal and the feedback signal, the output signal having a DC offset that varies corresponding to a varying parameter of the processing means, the amplifying means being operable to reduce variation of the DC offset of the output signal;
• and
• correcting means for receiving the output signal and producing a correction signal, the correction signal being used by the processing means to reduce a magnitude of the DC offset of the output signal.

A wireless transceiver, comprising:

• receiver means for receiving a modulated carrier signal, the receiver means including,
• amplifying means for receiving an input signal and a feedback signal and producing an intermediate signal;
• and
• processing means for receiving the intermediate signal and producing an output signal and the feedback signal, the output signal having a DC offset that varies corresponding to a varying parameter of the processing means, the amplifying means being operable to reduce variation of the DC offset of the output signal;
• where the amplifying means is a unity-gain buffering means.

A wireless transceiver, comprising:

• receiver means for receiving a modulated carrier signal, the receiver means including,
• amplifying means for receiving an input signal and a feedback signal and producing an intermediate signal;
• and
• processing means for receiving the intermediate signal and producing an output signal and the feedback signal, the output signal having a DC offset that varies corresponding to a varying parameter of the processing means, the amplifying means being operable to reduce variation of the DC offset of the output signal;
• where
• the wireless transceiver is compliant with one or more of the Institute of Electrical and Electronics Engineers standards 802.11, 802.11a, 802.11b, 802.11e, 802.11g, 802.11h, 802.11i, 302.11n, and 802.16.

A method for reducing variation of a DC offset, the method comprising:

• amplifying an input signal to produce an intermediate signal;
• processing the intermediate signal to produce a feedback signal and an output signal, the output signal having a DC offset that varies corresponding to a varying parameter of circuitry used to process the intermediate signal;
• and
• reducing variation of the DC offset of the output signal using the feedback signal by a factor that corresponds to a gain of the amplification.

A method for reducing variation of a DC offset, the method comprising:

• amplifying an input signal to produce an intermediate signal;
• processing the intermediate signal to produce a feedback signal and an output signal, the output signal having a DC offset that varies corresponding to a varying parameter of circuitry used to process the intermediate signal;
• and
• reducing variation of the DC offset of the output signal using the feedback signal;
• measuring the DC offset of the output signal;
• and
• applying a correction signal to the circuitry used to process the intermediate signal to reduce a magnitude of the DC offset of the output signal.

A method for reducing variation of a DC offset, the method comprising:

• amplifying an input signal to produce an intermediate signal;
• processing the intermediate signal to produce a feedback signal and an output signal, the output signal having a DC offset that varies corresponding to a varying parameter of circuitry used to process the intermediate signal;
• reducing variation of the DC offset of the output signal using the feedback signal;
• and
• amplifying the input signal includes buffering the input signal.

A method for reducing variation of a DC offset, the method comprising:

• amplifying an input signal to produce an intermediate signal;
• processing the intermediate signal to produce a feedback signal and an output signal, the output signal having a DC offset that varies corresponding to a varying parameter of circuitry used to process the intermediate signal;
• reducing variation of the DC offset of the output signal using the feedback signal;
• where
• the method is compliant with one or more of the Institute of Electrical and Electronics Engineers standards 802.11, 802.11a, 802.11b, 802.11e, 802.11g, 802.11h, 802.11i, 302.11n, and 802.16.