Distortion and noise cancellation based high-linearity CMOS broadband low noise amplifier

Abstract

The invention discloses a distortion and noise cancellation based high-linearity CMOS broadband low noise amplifier. The distortion and noise cancellation based high-linearity CMOS broadband low noise amplifier structurally comprises a distortion cancellation input stage and a noise cancellation output stage. The distortion cancellation input stage serves as a first stage of the low noise amplifier, input impedance matching and second-order cross modulation IMD2 cancellation are achieved by adopting CMOS complementary common-gate combination, meanwhile a complementary structure has the characteristic of current reuse, and accordingly power consumption is reduced. The noise cancellation output stage serves as a second stage and is mainly used for cancelling channel thermal noise current of two common-gate devices at the first stage and accordingly reducing the noise coefficient of a whole circuit. The distortion and noise cancellation based high-linearity CMOS broadband low noise amplifier can simultaneously achieve high linearity and low noise coefficient within a broadband range, and meanwhile gives consideration to other design parameters, such as input impedance matching, power gain and power consumption.

Description

technical field [0001] The invention belongs to the technical field of radio frequency integrated circuits, and in particular relates to a CMOS broadband low-noise amplifier (LNA) which simultaneously adopts distortion and noise canceling technologies. Background technique [0002] With the continuous emergence of mobile communication technologies such as 3G / 4G, wireless transceiver technology represented by radio frequency microwave is developing unprecedentedly. Different from the mature second-generation mobile communication devices, the current mobile communication terminals are tending to integrate multiple communication standards to meet the seamless connection of the network to realize real-time sharing of information. For example, smart phones can use GSM, WCDMA, WIFI and RFTV Wait. Traditional solutions are based on paralleling multiple narrowband paths to achieve multi-standard communication. This solution often occupies a large chip area and has stability problem...

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Problems solved by technology

The amplifier circuit does not use inductance, which avoids the problem that the narrow-band matching and frequency selection requirements cannot be well met due to the limited Q value.

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