Electronic device for a radiofrequency signal reception chain, comprising a low-noise transimpedance amplifier stage
AssigneeSTMicroelectronics S.r.l.
InventorLaurent Chabert
Life of this patent
Estimating the term…
Abstract
An electronic device includes a transimpedance amplifier stage having an amplifier end stage of the class AB type and a preamplifier stage coupled between an output of a frequency transposition stage and an input of the amplifier end stage. A self-biased common-mode control stage is configured to bias the preamplifier stage. The preamplifier stage is formed by a differential amplifier with an active load that is biased in response to the self-biased common-mode control stage.
Claims20
A transimpedance amplifier circuit, comprising
- an amplifier end stage,
- a preamplifier stage coupled between a transimpedance amplifier input and an input of the amplifier end stage, said preamplifier stage comprising:
- first bipolar transistors;
- and
- an active load;
- and
- a self-biased common-mode control stage configured to bias the preamplifier stage.
A transimpedance amplifier circuit, comprising:
- a first amplifier end stage having a first input;
- a second amplifier end stage having a second input;
- a resistive divider circuit coupled between a first output of the first amplifier end stage and a second output of the second amplifier end stage, the resistive divider circuit having an intermediate node between the first and second outputs;
- and
- a common-mode control circuit comprising a differential amplifier having a first input configured to receive a common-mode voltage and a second input coupled to the intermediate node of the resistive divider circuit, wherein the differential amplifier includes an output coupled to control biasing of the first and second amplifier end stages.
A transimpedance amplifier circuit, comprising:
- an amplifier end stage having an input and output, and
- a preamplifier stage coupled between an amplifier input and the input of the amplifier end stage and comprising first bipolar transistors as well as an active load, and a self-biased common-mode control stage configured to bias the preamplifier stage.
A transimpedance amplifier circuit, comprising:
- a first amplifier end stage having an input coupled to a first amplifier input;
- a second amplifier end stage having an input coupled to a second amplifier input;
- a resistive divider circuit coupled between a first output of the first amplifier end stage and a second output of the second amplifier end stage, the resistive divided circuit having an output node;
- a common-mode control circuit comprising a differential amplifier having a first input configured to receive a common-mode voltage and a second input coupled to the output node of the resistive divider circuit, the differential amplifier having an output coupled to control biasing of the first and second amplifier end stages.
Dependencies are inferred from the claim text.