Regeneration-based variable gain amplifier structure and control method thereof
A technology of gain amplifier and amplifier, which is applied in the direction of instrumentation, calculation, electrical digital data processing, etc., can solve the problem of large adjustment range, etc., and achieve the effect of reducing design difficulty, simple design, and reducing the adjustment range of regeneration time
Active Publication Date: 2018-11-30
SOUTHEAST UNIV
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Problems solved by technology
However, the current regenerative structure variable gain amplifier needs to strictly control the regeneration time, and the gain multiple controlled by the regeneration time cannot obtain a large adjustment range
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[0025] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0026] Such as figure 1 As shown, the present invention provides a variable gain amplifier structure based on regeneration, including 2 voltage followers, 2 capacitor arrays, 1 active negative impedance circuit and 1 clock generation circuit, wherein the capacitance in the capacitor array values are the same, the 2 voltage followers use figure 2 In the structure shown, when the input signal is generated by the previous stage, the signal first enters the voltage follower, and negative feedback is formed in the voltage follower, so as to realize the super following of the input signal, and at the same time provide a driving function, which can quickly charge the capacitor array .
[0027] Active negative impedance circuits such as image 3 As shown, MP1 and MP2 are PMOS transistors, and MN1 and MN2 are NMOS transi...
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The invention discloses a regeneration-based variable gain amplifier structure and a control method thereof. The regeneration-based variable gain amplifier structure comprises two voltage followers, two capacitor arrays, one active negative impedance circuit and one clock generation circuit, wherein the input end of the first voltage follower serves as the positive input end of the amplifier, theoutput end of the first voltage follower is connected with one end, which serves as the positive output end of the amplifier, of the active negative impedance circuit through the first capacitor array, the other end of the active negative impedance circuit serves as the negative output end of the amplifier and is connected with the output end of the second voltage follower through the second capacitor array, and the input end of the second voltage follower serves as the negative input end of the amplifier. The regeneration-based variable gain amplifier structure has a gain dB linear regulatingfunction and is capable of greatly lowering requirements on regeneration time.
Description
technical field [0001] The invention belongs to the technical field of analog circuits, and relates to an open-loop variable gain amplifier technology, in particular to a regeneration-based variable gain amplifier structure and a control method thereof. Background technique [0002] Variable gain amplifiers are widely used in the communication field. Traditional variable gain amplifiers usually consume a large amount of current. At the same time, the bandwidth of the variable gain amplifier is limited by the resistance array formed by the op amp. In recent years, with the continuous development of analog circuit technology, low power consumption variable gain amplifiers have gradually become a development trend. Current research on low-power variable-gain amplifiers focuses on the optimization of circuit structures and current multiplexing in circuits. The technology of current multiplexing usually requires a higher voltage, and cannot adapt to the mainstream direction of r...
Claims
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Login to View More IPC IPC(8): G06F17/50
CPCG06F30/36
Inventor 吴建辉侯冠男陈超李红冯世雄伍绍君仝飞
Owner SOUTHEAST UNIV