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Common-mode feedback circuit, corresponding signal processing circuit and method

A common-mode feedback and common-mode voltage technology, which is applied to electrical components, amplifiers with semiconductor devices/discharge tubes, amplifiers, etc., can solve problems such as the limitation of the output signal swing of the operational amplifier

Active Publication Date: 2016-03-16
STMICROELECTRONICS SRL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] With decreasing supply voltages, the op amp output signal swing can experience severe limitation

Method used

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  • Common-mode feedback circuit, corresponding signal processing circuit and method
  • Common-mode feedback circuit, corresponding signal processing circuit and method
  • Common-mode feedback circuit, corresponding signal processing circuit and method

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Embodiment Construction

[0022] In the ensuing description, various specific details are set forth in order to provide a thorough understanding of various examples of embodiments. Embodiments may be obtained without one or more of the specific details, or with other methods, components, materials, etc. In other instances, known structures, materials, or operations are not detailed or described so as not to obscure various aspects of the embodiments.

[0023] References to "an embodiment" or "one embodiment" within the framework of this specification are intended to indicate that a particular configuration, structure or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, phrases such as "in an embodiment" or "in one embodiment," which may be present at various points in this specification, do not necessarily refer to the same embodiment. Furthermore, particular conformations, structures or properties may be combined in any suitable manner in one or ...

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Abstract

A common-mode feedback circuit includes a transconductor input stage (10) with differential input terminals (Vin+, Vin-), and a frequency-compensated gain stage (14), coupled to the transconductor input stage (10), with differential output terminals (Vout+, Vout-). The common-mode feedback circuit also includes a feedback loop having a comparator configured to produce a feedback error signal for the transconductor input stage by comparing with a reference a common-mode sensing signal indicative of a common-mode voltage level sensed at the differential output terminals. In addition, the common-mode feedback loop includes a converter for converting the common-mode voltage level sensed at said differential output terminals into a current signal coupled to the comparator.

Description

technical field [0001] This specification deals with electronic circuits. [0002] One or more embodiments may be applied to common mode feedback circuits for use in differential amplifiers, for example. Background technique [0003] Operational amplifiers (op amps) are useful and versatile building blocks in analog signal processing circuits. [0004] With decreasing supply voltages, op amp output signal swings can experience severe limitation. [0005] One possible solution to increase output swing is to use a fully differential op amp topology, which also improves power supply noise / interference rejection. However, a fully differential structure may involve additional circuitry, namely a common-mode feedback (CMFB) circuit for setting the common-mode voltage at different high-impedance nodes not stabilized by the negative differential feedback. Contents of the invention [0006] There is still a felt need for improved common mode feedback circuits for use in differen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/26H03F3/45
CPCH03F1/083H03F3/45085H03F3/45502H03F3/45511H03F2200/456H03F2203/45008H03F2203/45418H03F2203/45424H03F2203/45431H03F1/086H03F1/0205H03F3/45179H03F2203/45116H03F2203/45288
Inventor F·卡拉拉F·托里西F·克莱里奇
Owner STMICROELECTRONICS SRL
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