Integrated programmable gain amplifier circuit and system including the circuit
AssigneeSTMicroelectronics S.r.l.
InventorsGermano Nicollini, Angelo Nagari
Life of this patent
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Abstract
An integrated programmable gain amplifier circuit that receives at an input an analog signal, circuit including an operational amplifier and a gain setup network comprising resistive elements and selection elements, which may be controlled in order to setup the gain of the amplifier circuit. The gain setup network further includes capacitive elements, for defining, together with the resistive elements and the operational amplifier, an anti-aliasing filter of the active RC type.
Claims22
An integrated programmable gain amplifier circuit, which is structured to receive at an input an analog signal, the circuit comprising:
- an operational amplifier and a gain setup network having resistive elements and selection elements that are structured to be controlled to setup gain of the amplifier circuit,
- the gain setup network having capacitive elements that, together with the resistive elements and the operational amplifier are structured to define an anti-aliasing filter of the active RC type in which a plurality of resistors and capacitors are cascode connected and selectively coupled together to provide a variable gain to the circuit.
A circuit for processing an analog signal, the circuit comprising:
- an anti-aliasing filter of the active RC type that includes:
- an amplifier;
- and
- a gain network that includes an input network coupled to a first input of the amplifier, and a feedback network coupled between an output of the amplifier and a second input of the amplifier, the feedback network having a plurality of RC cells coupled in cascode, each RC cell coupled to a respective selection switch that is structured to selectively couple each of the plurality of RC cells in the cascode connection to vary a ratio of total resistance of the feedback network to a total resistance of the input network.
A mobile communications device, comprising:
- an anti-aliasing filter of the active RC type that includes:
- an amplifier;
- and
- a gain network that includes an input network coupled to a first input of the amplifier, and a feedback network coupled between an output of the amplifier and a second input of the amplifier, the feedback network having a plurality of RC cells coupled in cascode, each RC cell coupled to a respective selection switch that is structured to selectively couple each of the plurality of RC cells in the cascode connection to vary a ratio of total resistance of the feedback network to a total resistance of the input network.
An integrated programmable gain amplifier circuit, which receives at an input an analog signal, the circuit comprising:
- an operational amplifier and a gain setup network having resistive elements and selection elements that are controlled to setup gain of the amplifier circuit,
- the gain setup network having capacitive elements, together with the resistive elements and the operational amplifier that is structured to define an anti-aliasing filter of the active RC type,
- wherein the gain setup network includes a first network, or input network, which is connected to an input of the operational amplifier and a second network, or feedback network, which is connected to an output of the operational amplifier, and the input of the operational amplifier, and wherein the selection elements are structured to allow varying the ratio between a total resistance of the feedback network and a total resistance of the input network, thereby allowing programming of amplifier circuit gain.
Dependencies are inferred from the claim text.