Ultra-wide band low-noise single-ended input and differential output amplifier

Abstract

The invention provides an ultra-wide band low-noise single-ended input and differential output amplifier, which is characterized in that the amplifier comprises a common-gage amplification stage (1), a single-ended-to-differential stage (2) and a capacitor cross-coupling output buffer (3), wherein an output end of the common-gate amplification stage (1) is connected with an input end of the single-ended-to-differential stage (2); and an output end of the single-ended-to-differential stage (2) is connected with an input end of the capacitor cross-coupling output buffer (3). According to amplifier, a pre-amplification stage and the single-ended-to-differential stage adopt a current reuse technology, so that one stage of current consumption can generate two stages of amplification; the common-gate amplification stage provides wide band input matching and avoids a no-source matching network; load impedances of the pre-amplification stage and the single-ended-to-differential stage are resonated at different frequencies respectively; functions of signal amplification of the wide band and single-ended-to-differential are realized by gain complementation of the pre-amplification stage and the single-ended-to-differential stage; a capacitor cross-coupling technology is applied in the output buffer additionally; amplitude and phase of an output differential signal are compensated to reach the balance between the amplitude and the phase of the differential signal; and the gain of the output buffer is increased.

Description

technical field [0001] The invention relates to an ultra-wideband single-end input differential output low-noise amplifier, which belongs to the technical field of radio frequency integrated circuits. Background technique [0002] The low noise amplifier is the key module of the receiver in the wireless transmission system. It is generally connected to the antenna to amplify the received weak signal and minimize the deterioration of the signal. Port matching, gain, noise figure, power consumption and linearity are the main technical parameters of LNAs. [0003] The receiver generally completes the signal amplification and down conversion functions. The low noise amplifier amplifies the received RF signal, and the post-stage mixer converts the RF signal into an intermediate frequency signal. Both the local oscillator input and the RF input of the double-balanced mixer are in the form of differential pairs. The double-balanced mixer provides a high degree of isolation between...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of poor gain effect, high power consumption and inapplicability in ultra-wideband technology existing in the existing singl

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