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US 2016/0087594 A1Published application
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
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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.
Claims10
An electronic device, comprising:
- an input configured to receive signals having a first frequency, and
- a differential architecture circuit, comprising:
- at least one frequency transposition stage coupled to the input and having a current output, and
- a transimpedance amplifier stage having an amplifier end stage of the class AB type, a preamplifier stage coupled between the current output of the frequency transposition stage and an 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.
1 more element
An electronic device, comprising:
- a frequency transposition stage having a first current output and a second current output, and
- a transimpedance amplifier stage comprising:
- a first amplifier end stage of the class AB type having an input coupled to the first current output;
- a second amplifier end stage of the class AB type having an input coupled to the second current output;
- 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 of the class AB type.
3 more elements
Dependencies are inferred from the claim text.