Radio frequency receiver

Abstract

A radio frequency receiver is provided. The receiver can be employed in a low power (or ultra-low power) receiver architecture to generate a baseband signal or an intermediate frequency signal. In addition, the receiver includes capabilities of gain control to provide different gain settings as well as providing better / improved impedance matching control.

Description

[0001] 【Technical field】 [0002] The present application relates generally to a receiver scheme, and more particularly to a radio frequency receiver front-end. [0003] 【Background technique】 [0004] In general, a conventional receiver includes a Low Noise Amplifier (LNA) for improving the signal-to-noise ratio, a mixer for frequency conversion, and a low-pass filter for channel selection and filtering out unwanted signals. The linearity of conventional receivers is usually limited by the LNA and mixer. To achieve high linearity, a conventional solution may configure the output impedance of the LNA to be low impedance, and pair it with a passive mixer with good linearity characteristics. In order to achieve low output impedance, a conventional solution can use a transimpedance amplifier (transimpedance amplifier, TIA), wherein the TIA has a low input impedance at the baseband, and the low input impedance can be converted to RF frequency. Additionally, to suppress the misma...

AI Technical Summary

Problems solved by technology

Also, to suppress the mismatch impairments introduced by passive mixing, the mixer size must be large to reduce the need for adding additional mixer switch impedance to the required low impedance path

Unfortunately, larger mixer sizes require larger local oscillator (LO) drivers, and thus result in larger power consumption

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