Low-power consumption single-ended input difference output low-noise amplifier

Abstract

The invention discloses a low power dissipation single end input difference output low noise amplifier, belonging to radio frequency communication technical field. The amplifier comprises an input matching circuit, a first stage amplifying circuit, a second stage common grid amplifying circuit and a second stage comon source amplifying circuit which are connected with each other, and an output load matching circuit, the input matching circuit is connected with the first stage amplifying circuit, a control circuit is provided between the first stage amplifying circuit and the second stage comon source amplifying circuit, the control circuit is used for controlling direct current flowing to the second stage common grid amplifying circuit to flow to the first stage amplifying circuit, meanwhile, stops the radio frequency signal outputted by the first stage amplifying circuit to flow to the source end of the second stage comon source amplifying circuit, the second stage comon source amplifying circuit and the second stage common grid amplifying circuit are respectively connected with one output load matching circuit. The invention can resuce half of the system power consumption, and the second amplifying circuits are symmetrical, thereby ensuring output noise, phase and gain of the differential signal more symmetrical.

Description

Technical field [0001] The present invention relates to the design of a radio frequency receiver in the technical field of radio frequency communication, and specifically relates to a low-power single-ended input differential output low noise amplifier. Background technique [0002] With the rapid development of wireless communication technology and CMOS integrated circuit technology, miniaturization, low power consumption, low cost, and high performance of wireless terminals have become an inevitable trend in the development of radio frequency integrated circuits (RFIC). [0003] In the design of radio frequency receivers, the key to obtaining good overall system performance lies in a front end with superior performance. The first-stage module low noise amplifier (LNA) of the RF receiver is one of the most critical circuits, such as figure 1 As shown, the function of the single-ended input differential output low-noise amplifier is to amplify the radio frequency signal under the p...

AI Technical Summary

Problems solved by technology

[0005] With the improvement of circuit integration, especially with the development of SOC that integrates RF circuits and Baseband circuits, substrate coupling noise becomes more and more serious, and single-ended amplifiers, mixers, etc. have no ability to suppress substrate coupling. , substrate coupling will greatly affect the performance of LNA and mixer, and ultimately greatly deteriorate the performance of the system receiver

[0006] The differential LNA and double-balanced mixer scheme can better suppress the influence of common-mode noise, but an additional balanced converter Balun is required to convert the single-ended signal received by the antenna into a differential signal

The balun is difficult to integrate on-chip, requires the use of off-chip components, and will introduce a loss of 1-3dB, which will greatly deteriorate the sensitivity of the RF receiver (about 1-3dB), reduce the integration of the system, and increase the system cost

[0007] Therefore, the traditional single-ended input differential output low-noise amplifier cannot solve the mismatch problem between gain, amplitude and phase in the differential output signal well, especially the noise mismatch of the differential signal is serious, and the power consumption is large

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