Variable gain amplifier
A gain amplifier and variable technology, applied in the electronic field, can solve the problems such as the inability to achieve a constant output phase, and achieve the effect of small steps, high performance, and constant output phase
Active Publication Date: 2016-11-09
HISILICON TECH
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[0008] The embodiment of the present invention provides a variable gain amplifier to solve the problem that the existing variable gain amplifier cannot achieve constant output phase under different gains
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[0052] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0053] In order to solve the problem that the existing variable gain amplifier cannot achieve constant output phase under different gains, the embodiment of the present invention proposes a variable gain amplifier, such as image 3 As shown, it is a schematic structural diagram of the variable gain amplifier described in this embodiment. Specifically, by image 3 It can be known that the variable gain amplifier may include a gain ...
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The invention discloses a variable gain amplifier. The variable gain amplifier comprises a gain control unit and a phase-compensating unit, wherein the gain control unit comprises one or two groups of transistors, and is used for controlling the magnitude of output current of the transistors by changing the magnitudes of bias voltages of the transistors in the one or two groups of transistors in order to change a gain of the variable gain amplifier; and the phase compensating unit is used for compensating for a phase of the output current of the transistors in the one or two groups of transistors in order to keep a phase of an output signal of the variable gain amplifier constant. In the scheme, a phase-compensating network can be arranged at an input stage of the variable gain amplifier in order that the variable gain amplifier can keep the output phase constant in different gain states, so that the problem of incapability of keeping the output phase constant under different gains in an existing variable gain amplifier is solved, and the performance of the variable gain amplifier is improved.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to a variable gain amplifier. Background technique [0002] Since the phased array system has strict requirements on the phase of the signal, for the VGA (Variable Gain Amplfier, variable gain amplifier) circuit applied in the phased array system, in addition to the gain control function, It also needs to have the function of keeping the output phase constant under different gain states, otherwise the phase shift accuracy will be deteriorated and the system performance will be affected. [0003] At present, the following two amplifier structures are often used in the industry to achieve effective control of amplifier gain: [0004] The first is the current steering (Current Steering) type variable gain amplifier. like figure 1 As shown, where I represents a current source, R is a pull-up resistor, and Q0-Qn1 and Q1N-Q2N represent transistors (such as triodes or MOS tubes). ...
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IPC IPC(8): H03G3/30H03F1/32H03F3/45
CPCH03F1/3211H03F3/45636H03G3/30
Inventor 袁成彭嵘
Owner HISILICON TECH