Dynamic high-pass filter cut-off frequency adjustment
AssigneeApple Inc.
InventorsXinping ZENG, Mohit Narang, Peter M. Agboh, Vusthla Sunil Reddy
Life of this patent
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Abstract
A transceiver that allows dynamic high-pass filter (HPF) cut-off frequency adjustment may include a mixer circuit to mix a local oscillator (LO) signal with a receive (RX) signal received from a transmitter to generate a baseband signal. The transceiver may further include a high-pass filter (HPF) having an adjustable cut-off frequency that is used to reduce a DC offset of the baseband signal. A control circuit can dynamically control components of the HPF to set the adjustable cut-off frequency at a first frequency during a first time period and at a second frequency during a second time period.
Claims22
A transceiver comprising:
- a mixer circuit configured to mix a local oscillator (LO) signal with a receive (RX) signal to generate a baseband signal;
- a high-pass filter (HPF) having an adjustable cut-off frequency configured to reduce a DC offset of the baseband signal;
- and
- a control circuit configured to dynamically control components of the HPF to set the adjustable cut-off frequency at a first frequency during a first time period and at a second frequency during a second time period.
A communication system comprising:
- a transceiver configured to communicate with an other transceiver, the transceiver comprising:
- a demodulator configured to demodulate a signal transmitted by the other transceiver and to generate a baseband signal;
- a high-pass filter (HPF) configured to reduce a DC offset of the baseband signal;
- and
- a controller configured to dynamically control a cut-off frequency of the HPF.
A method comprising:
- configuring a mixer circuit of a first transceiver to demodulate a signal received from a second transceiver and to generate a baseband signal;
- coupling an adjustable high-pass filter (HPF) to an output node of the mixer circuit to reduce a DC offset of the baseband signal;
- and
- configuring a control circuit to dynamically adjust the adjustable HPF by setting the adjustable cut-off frequency at a first frequency during a first time period and at a second frequency during a second time period.
Dependencies are inferred from the claim text.