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US 8,957,728 B2Granted
Combined filter and transconductance amplifier
AssigneeRF Micro Devices, Inc.
InventorPhilippe Gorisse
Life of this patent
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Abstract
Embodiments of circuitry, which includes an operational transconductance amplifier and a passive circuit, are disclosed. The passive circuit is coupled to the operational transconductance amplifier. Further, the passive circuit receives an input signal and the operational transconductance amplifier provides an output current, such that the passive circuit and the OTA high-pass filter and integrate the input signal to provide the output signal.
Claims17
Circuitry comprising:
- a passive circuit adapted to receive an input signal;
- and
- an operational transconductance amplifier (OTA) coupled to the passive circuit and adapted to provide an output current, such that:
- the passive circuit and the OTA provide a high-pass filter, which is configured to high-pass filter and integrate the input signal to provide the output current;
- the passive circuit comprises a feedback impedance circuit coupled between an output from the OTA and an inverting input to the OTA;
- and
- during a first set of operating conditions, the feedback impedance circuit has a feedback current, such that a magnitude of the output current is at least ten times greater than a magnitude of the feedback current.
4 more elements
Circuitry comprising:
- a passive circuit adapted to receive an input signal;
- and
- an operational transconductance amplifier (OTA) coupled to the passive circuit and adapted to provide an output current, such that:
- the passive circuit and the OTA provide a high-pass filter, which is configured to high-pass filter and integrate the input signal to provide the output current;
- the passive circuit comprises a low-pass filter, such that the output current is further based on low-pass filtering the input signal;
- and
- a cutoff frequency of the high-pass filter is about equal to a cutoff frequency of the low-pass filter.
4 more elements
Circuitry comprising:
- an active ripple cancellation circuit and a switching supply inductive element;
- a passive circuit adapted to receive an input signal;
- and
- an operational transconductance amplifier (OTA) coupled to the passive circuit and adapted to provide an output current, such that:
- the passive circuit and the OTA high-pass filter and integrate the input signal to provide the output current;
- the OTA and the passive circuit provide a combined filter and OTA;
- the OTA is further adapted to provide a derived output current that is representative of the output current;
- the active ripple cancellation circuit comprises the combined filter and OTA;
- the switching supply inductive element has an inductor current having a ripple current;
- and
- the derived output current at least partially cancels the ripple current.
8 more elements
Dependencies are inferred from the claim text.