Single ended differential gain amplifier with configurable radio frequency broadband gain

Abstract

The invention discloses a single ended differential gain amplifier with a configurable radio frequency broadband gain. The gain amplifier comprises a single ended differential circuit with a configurable gain, a broadband amplifying circuit with the configurable gain and a buffer driving circuit with the configurable gain which are sequentially connected in series. Gain control ends of the circuits are connected with a gain control signal from an outer digital base band processing module to form a gain value of the single ended differential gain amplifier with the configurable radio frequency broadband gain in combination, according to the control of each circuit at a set fixed step pitch, fine adjustment on the gain is implemented, thus a range of the broadband signal output by the differential conforms to a range value of a set signal, and strong disturbance is effectively restrained. Since the strong detection and processing capability of a digital processing module chip of the outer base band is good for a gain control mode, the gain control is enabled not to be affected from temperature, process, noise and the like, and more precise and flexible control can be realized. The control range of the gain is a summation of the maximum gain control ranges of the three circuits with the configurable gains, so that the gain amplifier is suitable for application of the high dynamic input with strong disturbance or weak signal, and is suitable for a radio frequency chip with multiple frequencies and multiple modes of a single ended broadband radio frequency signal input.

Description

Contents of the invention [0001] The invention belongs to the technical field of radio frequency communication, and relates to a single-end to differential amplifier circuit, in particular to a single-end to differential gain configurable radio frequency broadband gain amplifier, which is used in a radio frequency receiver, and it can realize the amplified output of small signals, At the same time, the suppression of strong interference signals can be realized, and the amplification and reduction of input signals are controlled by the baseband digital processing module chip. Background technique [0002] In recent years, with the continuous emergence of new technologies in the field of information technology and the continuous progress of technology, the RF front-end and baseband digital processing module chips of various receiver systems have achieved great development. The development of chips with fixed small gain or large gain is becoming more and more mature, but becaus...

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Problems solved by technology

[0004] There are many disadvantages in the prior art RF gain amplifiers: First, the RF amplifiers with traditional structure are all fixed gain, which is not suitable for high dynamic input requirements with strong interference or weak signals

Second, RF amplifiers with traditional structures work in a narrow-band environment, which cannot meet the requirements of simultaneous input of signals of different bands.

Third, none of the traditional radio frequency amplifiers can convert single-ended signals into differential circuits, and an additional balun component that converts single-ended signals into differential signals is required outside the chip, which not only increases the cost of the overall solution, but also increases the input The output chip pins reduce the stability of the signal and increase the difficulty of the overall design

Fourth, there are limitations and defects in the driving capability of the output buffer circuit

Single-ended to differential gain configurable RF wideband gain amplifier gain step ratio is large is single-ended to differential gain configurable gain coarse adjustment in RF wideband gain amplifier

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