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US 10,439,593 B2Granted
Multi-band filter architectures
AssigneeQUALCOMM Incorporated
InventorsTimothy Donald Gathman, Lai Kan Leung, Chirag Dipak Patel, Rajagopalan Rangarajan
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Abstract
Certain aspects of the present disclosure relate to multi-band filter architectures and methods for filtering signals using the multi-band filter architectures. One example multi-band filter generally includes a transconductance-capacitance (gm-C) filter and a reconfigurable load impedance coupled to an output of the gm-C filter, the reconfigurable load impedance comprising a first gyrator circuit coupled to a second gyrator circuit.
Claims25
A multi-band filter comprising:
- a transconductance-capacitance (gm-C) filter;
- and
- a reconfigurable load impedance coupled to an output of the gm-C filter, the reconfigurable load impedance comprising a first gyrator circuit coupled to a second gyrator circuit, wherein the first gyrator circuit is coupled to the second gyrator circuit via a switch, and wherein the multi-band filter is configured as a high-pass filter when the switch is open and as a notch filter when the switch is closed.
A multi-band filter comprising:
- a transconductance-capacitance (gm-C) filter;
- a reconfigurable load impedance coupled to an output of the gm-C filter, the reconfigurable load impedance comprising a first gyrator circuit coupled to a second gyrator circuit;
- and
- a first switch, wherein:
- the first gyrator circuit comprises a first feedforward transconductor having an input coupled to the output of the gm-C filter and an output coupled to one terminal of the first switch;
- the first gyrator circuit further comprises a first feedback transconductor having an input coupled to another terminal of the first switch and an output coupled to the output of the gm-C filter;
- the second gyrator circuit comprises a second feedforward transconductor having an input coupled to the output of the first feedforward transconductor;
- and
- the second gyrator circuit further comprises a second feedback transconductor having an input coupled to an output of the second feedforward transconductor and an output coupled to the input of the first feedback transconductor.
6 more elements
A multi-band filter comprising:
- a transconductance-capacitance (gm-C) filter;
- and
- a reconfigurable load impedance coupled to an output of the gm-C filter, the reconfigurable load impedance comprising a first gyrator circuit coupled to a second gyrator circuit, wherein the multi-band filter is capable of being configured to have a frequency response with two or more non-contiguous passbands having different center frequencies.
A method of processing an input signal, comprising:
- configuring a multi-band filter to have a first configuration, the multi-band filter comprising a transconductance-capacitance (gm-C) filter and a reconfigurable load impedance coupled to an output of the gm-C filter, the reconfigurable load impedance comprising a first gyrator circuit coupled to a second gyrator circuit;
- filtering the input signal with the multi-band filter in the first configuration;
- configuring the multi-band filter to have a second configuration, different from the first configuration;
- and
- filtering the input signal with the multi-band filter in the second configuration, wherein the first gyrator circuit is coupled to the second gyrator circuit via a first switch, wherein configuring the multi-band filter to have the first configuration comprises setting the first switch to have a first position, and wherein configuring the multi-band filter to have the second configuration comprises setting the first switch to have a second position, wherein the multi-band filter is configured as a high-pass filter when the first switch is open and as a notch filter when the first switch is closed.
2 more elements
Dependencies are inferred from the claim text.