Variable Gain Amplifier in RF Signal Transceiver Chip
A gain amplifier and gain amplification technology, which is applied in the direction of gain control, amplification control, electrical components, etc., to achieve good social and economic benefits, easy to implement, and simple structure
Active Publication Date: 2018-09-07
陕西光电子先导院科技有限公司
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Problems solved by technology
[0006] The purpose of the present invention is mainly to solve the problem of amplifying the different power signals received by the antenna to the power required for quantization and demodulation
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[0037] The concrete principle of the variable gain amplifier in the radio frequency signal transceiver chip provided by the present invention is:
[0038] It includes a variable gain amplifier 1, the gain of which is controlled by the lower three-bit binary digital signal, and the gain of the variable gain amplifier 1 can change accordingly according to the assignment of the three-bit digital signal.
[0039]It includes a variable gain amplifier 2, the gain of which is controlled by a two-bit binary digital signal, and the gain of the variable gain amplifier 2 can change accordingly according to the assignment of the two-bit digital signal. Two cascaded forms of two variable gain amplifiers are used here, and they all use high two binary digital signals to control their gain.
[0040] It also includes a bias circuit, which provides the variable gain amplifier 1 and the two variable gain amplifiers 2 with the same tail current, and provides them with enable signals. The bias c...
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The present invention provides a variable gain amplifier in a radio-frequency signal transceiver chip. The variable gain amplifier can be applied to a receiver with a large dynamic input signal range and can realize precise control on the gain step size, and is less affected by the temperature. The variable gain amplifier comprises at least one low three bit binary variable gain amplifying unit, at least one high two bit binary variable gain amplifying unit, and a biasing circuit which is used for providing enable signals and same tail current for the low three bit binary variable gain amplifying unit and the high two bit binary variable gain amplifying unit; two orthogonal signals are subjected to variable gain amplification via the low three bit binary variable gain amplifying unit and the high two bit binary variable gain amplifying unit in sequence and then are output; or the two orthogonal signals are subjected to variable gain amplification via the high two bit binary variable gain amplifying unit and the low three bit binary variable gain amplifying unit in sequence and then are output.
Description
technical field [0001] The invention relates to a variable gain amplifier used in a radio frequency signal transceiver chip, and is particularly suitable for a monolithic integrated radio frequency chip used in GPS and Beidou wideband radio frequency receivers. Background technique [0002] With the different transmission conditions of the signal received by the radio frequency receiver, the power of the effective signal received by the antenna will change in a large range, and the power of the interference received by the antenna may also change. [0003] In order to finally be able to demodulate the signal received by the antenna, a variable gain amplifier circuit is required to amplify the desired signal of different power received by the antenna to the optimal power required for quantization by the baseband analog-to-digital converter. In this way, the quantization noise introduced by the baseband analog-to-digital converter can be reduced to the greatest extent, so as t...
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IPC IPC(8): H03G3/20
Inventor 黄海生陈顺舟李鑫
Owner 陕西光电子先导院科技有限公司