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US 11,909,368 B2Granted
Dual mode notch filter
AssigneeQUALCOMM Incorporated
InventorsKai Zhan, Chinmaya Mishra
Life of this patent
Estimating the term…
Abstract
A dual mode notch filter for use in a multi-band millimeter wave (mmW) transmitter includes a transmit filter circuit disposed between two amplifiers in a mmW transmit signal path, the transmit filter circuit formed by at least one switch, at least one capacitor, and a double-tuned transformer, the transmit filter circuit having at least two modes configured to selectively filter a spurious signal in at least a first communication band.
Claims30
A millimeter wave (mmW) transmitter, comprising:
- a first amplifier configured to amplify a mmW transmit signal;
- a second amplifier configured to amplify the mmW transmit signal;
- a double-tuned transformer coupled to an output of the first amplifier and an input of the second amplifier;
- and
- a transmit filter circuit coupled between the first amplifier and the second amplifier, the transmit filter circuit formed by at least one switch, at least one capacitor, and an inductance, the transmit filter circuit having at least two modes configured to selectively filter a spurious signal in at least a first mmW communication band.
2 more elements
A transmit filter circuit comprising:
- a positive input terminal;
- a negative input terminal;
- a center-tapped inductance comprising a first terminal coupled to the positive input terminal and a second terminal coupled to the negative input terminal;
- a switch comprising a first terminal coupled to the first terminal of the center-tapped inductance and a second terminal coupled to the second terminal of the center-tapped inductance;
- a first capacitance coupled between the first terminal of the switch and the first terminal of the center-tapped inductance;
- and
- a second capacitance coupled between the second terminal of the switch and the second terminal of the center-tapped inductance.
4 more elements
A method for filtering a communication signal, comprising:
- amplifying a first communication signal in a first millimeter wave (mmW) communication band;
- amplifying a second communication signal in a second mmW communication band;
- providing a first filter response;
- providing a second filter response, the first filter response configured to reduce unwanted spectral emission of a local oscillator (LO) signal to the first amplified communication signal, while having a negligible effect on the second amplified communication signal;
- amplifying the first filtered communication signal;
- and
- amplifying the second filtered communication signal.
4 more elements
A device, comprising:
- means for amplifying a first communication signal in a first millimeter wave (mmW) communication band;
- means for amplifying a second communication signal in a second mmW communication band;
- means for providing a first filter response;
- means for providing a second filter response, the first filter response configured to reduce unwanted spectral emission of a local oscillator (LO) signal to the first amplified communication signal, while having a negligible effect on the second amplified communication signal;
- means for amplifying the first filtered communication signal;
- and
- means for amplifying the second filtered communication signal.
4 more elements
Dependencies are inferred from the claim text.