Active filters and gyrators including cascaded inverters
AssigneeQUALCOMM Incorporated
InventorsGurkanwal Singh Sahota, Aleksandar Miodrag Tasic
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Abstract
An aspect relates to a filter or a first gyrator including a first set of cascaded inverters, and a first set of one or more passive devices coupled to the first set of cascaded inverters. Another aspect relates to a method including applying an input signal to an input of a first one of a set of cascaded inverters coupled to a set of one or more passive devices, and receiving an output signal from the set of cascaded inverters, the output signal being a filtered version of the input signal. Still another aspect relates to a transceiver including a filter with a first set of cascaded inverters, and a first set of one or more passive devices coupled to the first set of cascaded inverters; and a mixer coupled to the filter.
Claims26
An apparatus, comprising:
- a filter configured to receive and filter an input signal to generate an output signal, the filter including a first filter stage and a second filter stage, the first filter stage comprising:
- a first set of cascaded inverters;
- a first set of one or more passive devices coupled to the first set of cascaded inverters, wherein the first set of one or more passive devices is connected between an output of a first one of the first set of cascaded inverters and a voltage rail;
- and
- an electrical-conductor extending, in a feedback path, from an input of the first one of the first set of cascaded inverters to an output of a second one of the first set of cascaded inverters without any intervening components therebetween;
- the second filter stage comprising:
- a second set of one or more cascaded inverters;
- and
- a second set of one or more passive devices connected between an input of a first one of the second set of cascaded inverters and an output of a second one of the second set of cascaded inverters;
- and
- a signal generator, external to the filter, configured to generate and provide the input signal to the filter,
- wherein an output of the first filter stage is coupled to an input of the second filter stage.
An apparatus, comprising a first filter stage comprising a first gyrator connected between a node and a voltage rail, the first gyrator comprising:
- a first set of cascaded inverters;
- a first set of one or more passive devices coupled to the first set of cascaded inverters, wherein the first set of one or more passive devices is connected between an output of a first one of the first set of cascaded inverters and the voltage rail;
- and
- an electrical-conductor extending, in a feedback path, from an input of the first one of the first set of cascaded inverters to an output of a second one of the first set of cascaded inverters without any intervening components therebetween,
- wherein the first filter stage further comprises a second gyrator connected between the node and the voltage rail.
An apparatus, comprising a first filter stage comprising a first gyrator connected between a node and a voltage rail, the first gyrator comprising:
- a first set of cascaded inverters;
- a first set of one or more passive devices coupled to the first set of cascaded inverters, wherein the first set of one or more passive devices is connected between an output of a first one of the first set of cascaded inverters and the voltage rail;
- and
- an electrical-conductor extending, in a feedback path, from an input of the first one of the first set of cascaded inverters to an output of a second one of the first set of cascaded inverters without any intervening components therebetween,
- wherein the first filter stage comprises a capacitor coupled in series with the first gyrator between the node and the voltage rail.
Dependencies are inferred from the claim text.