Apparatus and circuit for amplifying baseband signal
a baseband analog and amplifier technology, applied in the direction of low noise amplifiers, charge amplifiers, pulse automatic control, etc., can solve the problems of reducing battery use time, power consumption, and deteriorating the gain of an opamp
Active Publication Date: 2013-06-20
SAMSUNG ELECTRONICS CO LTD
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- Description
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- Application Information
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Benefits of technology
The patent aims to provide a device that can lower the power consumption of a mobile device's signal amplifier.
Problems solved by technology
However, the circuit detecting an average of voltages between outputs at both terminals using a resistor lowers output impedance due to the resistance, so that a gain of an OpAmp is deteriorated.
Also, since the CMFB should have a gain-bandwidth product that is the same as the OpAmp in order to maintain stability, power consumption is considerable and occupies about 40% of the power consumed by each OpAmp Since a baseband filter makes up a large portion of an RFIC in a wireless terminal, power consumption increases due to the CMFB of the OpAmp Accordingly, battery use time reduces, which lowers competitiveness of a product employing the CMFB.
Method used
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Embodiment Construction
[0025]The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
[0026]The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodime...
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An operational amplifier circuit is provided. The operational amplifier circuit includes a differential amplifier of a cascade structure and a switched-capacitor type Common-Mode FeedBack (CMFB) circuit. The differential amplifier amplifies a difference between two input signals to output an anode output voltage and a negative output voltage. The switched-capacitor type CMFB circuit averages the anode output voltage and the negative output voltage of the differential amplifier, compares the average voltage with a reference voltage to generate a feedback signal based on a result of the comparison, and provides the feedback signal to the differential amplifier. Therefore, power consumption is reduced and a battery use time of a wireless terminal can be extended. Also, since an operational amplifier gain of each analog filter terminal is not negatively affected, a Direct Current (DC) offset is reduced, thereby improving signal quality.
Description
PRIORITY[0001]This application claims the benefit under 35 U.S.C. §119(a) of a Korean patent application filed on Dec. 16, 2011 in the Korean Intellectual Property Office and assigned Serial No. 10-2011-0136718, the entire disclosure of which is hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a circuit for amplifying a baseband analog signal in a receiver. More particularly, the present invention relates to a differential operational amplifier to which a switched-capacitor type Common-Mode FeedBack (CMFB) circuit is coupled.[0004]2. Description of the Related Art[0005]Generally, a baseband analog filter forming a Radio Frequency Integrated Circuit (RFIC) of a receiver includes a differential Operational Amplifier (OpAmp) of a serial structure of a fifth degree or more. For example, the baseband analog filter has a structure where five or more differential operational amplifiers are serially connected. ...
Claims
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IPC IPC(8): H03F3/45H03L7/00
CPCH03F3/45071H03L7/00H03F2203/45514H03F3/45977H03F2203/45138H03F3/45475H03F1/342H03F3/195H03F3/45179H03F3/45654H03F2200/294H03F2200/336H03F2200/405H03F2200/451H03F2203/45404H03F2203/45421H03F2203/45422H03F2203/45444H03F2203/45512H03F2203/45522H03F2203/45526H03F2203/45528H03F2203/45591H03F2203/45594H03F3/45H03F3/70
Inventor LEE, JONG-WOOJUN, SI-BUM
Owner SAMSUNG ELECTRONICS CO LTD
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