Communications receiver method and apparatus

Abstract

A radiofrequency (RF) receiver circuit and method offer one or more performance improvements, such as an increased input compression point through better out-of-band interference suppression. In one example, an RF receiver circuit includes a low-noise amplifier (LNA) circuit and a mixer. The mixer output signal serves as negative feedback to the LNA circuit for improved compression point performance at interferer frequencies in or out of band with respect to a frequency of interest. Compression point performance is further improved for interferer signal components away from the frequency of interest by including at least one frequency-dependent circuit in the LNA circuit that is configured to reduce amplifier gain for such frequencies. The frequency-dependent circuit(s) may be tunable for different frequencies of interest. Additional improvements may be obtained by including a broadband input matching circuit and/or by including active mixer loads to increase the voltage conversion gain of the RF receiver circuit.

Dependencies are inferred from the claim text.