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US 10,630,328 B2Granted
Current-mode filtering using current steering
AssigneeQUALCOMM Incorporated
InventorsTimothy Donald Gathman, Chirag Dipak Patel, Lai Kan Leung
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Abstract
An apparatus is disclosed for current-mode filtering using current steering. In an example aspect, the apparatus includes a filter. The filter includes a current-steering node, a first output node, a second output node, a wideband path, and a narrowband path. The wideband path is coupled between the current-steering node and the first output node. The wideband path includes a wideband low-pass filter configured to pass frequencies within a wide passband. The narrowband path is coupled between the current-steering node and the second output node. The narrowband path includes a narrowband low-pass filter configured to pass a portion of the frequencies that are within a narrow passband.
Claims28
An apparatus comprising:
- a filter including:
- a current-steering node;
- a first output node and a second output node;
- a wideband path coupled between the current-steering node and the first output node, the wideband path including a wideband low-pass filter configured to pass frequencies within a wide passband, the wideband low-pass filter including a wideband transimpedance amplifier coupled in series along the wideband path between the current-steering node and the first output node;
- and
- a narrowband path coupled between the current-steering node and the second output node, the narrowband path including a narrowband low-pass filter configured to pass a portion of the frequencies that are within a narrow passband, the narrowband low-pass filter including a narrowband transimpedance amplifier coupled in series along the narrowband path between the current-steering node and the second output node.
3 more elements
An apparatus comprising:
- a filter including:
- a current-steering node configured to accept an input current comprising at least a high-frequency narrowband signal a low-frequency narrowband signal, and a low-frequency wideband signal;
- a first output node and a second output node;
- a wideband path coupled between the current-steering node and the first output node, the wideband path including wideband filter means for passing the high-frequency narrowband signal to the first output node;
- a narrowband path coupled between the current-steering node and the second output node, the narrowband path including narrowband filter means for passing the low-frequency narrowband signal to the second output node;
- and
- impedance means for steering the high-frequency narrowband signal and the low-frequency narrowband signal to the wideband path and the narrowband path, respectively, the impedance means comprising switch means for disconnecting the narrowband path from the current-steering node, the impedance means configured to steer the low-frequency wideband signal to the wideband path, the wideband filter means configured to pass the low-frequency wideband signal to the first output node.
4 more elements
A method for current-mode filtering using current steering, the method comprising:
- accepting an input current comprising at least a high-frequency narrowband signal and a low-frequency narrowband signal at a current-steering node;
- steering the high-frequency narrowband signal to a wideband path including a wideband transimpedance amplifier, the wideband path coupled between the current-steering node and a first output node;
- steering the low-frequency narrowband signal to a narrowband path including a narrowband transimpedance amplifier, the narrowband path coupled between the current-steering node and a second output node;
- passing the high-frequency narrowband signal to the first output node;
- and
- passing the low-frequency narrowband signal to the second output node.
3 more elements
An apparatus comprising:
- an antenna;
- and
- a receiver including:
- a low-noise amplifier coupled to the antenna;
- a mixer coupled to the low-noise amplifier;
- at least one analog-to-digital converter;
- and
- a filter including a current-steering node coupled to the mixer, a wideband path including a wideband transimpedance amplifier, a narrowband path including a narrowband transimpedance amplifier, and at least one output node respectively coupled to the at least one analog-to-digital converter;
- the wideband path and the narrowband path coupled between the current-steering node and the at least one output node;
- the filter configured to selectively have:
- a wideband low-pass response via the wideband path at a first time;
- and
- a narrowband low-pass response via the narrowband path at a second time.
10 more elements
An apparatus comprising:
- a filter including:
- a current-steering node;
- a first output node and a second output node;
- a wideband path coupled between the current-steering node and the first output node, the wideband path including a wideband low-pass filter configured to pass frequencies within a wide passband;
- and
- a narrowband path coupled between the current-steering node and the second output node, the narrowband path including a narrowband low-pass filter configured to pass a portion of the frequencies that are within a narrow passband, the narrowband low-pass filter configured to have an impedance, the wideband low-pass filter configured to have another impedance that is larger within the narrow passband and smaller within a portion of the wide passband that is outside of the narrow passband relative to the impedance of the narrowband low-pass filter.
3 more elements
Dependencies are inferred from the claim text.