Passive wireless receiver

Abstract

A passive wireless receiver to receive an input signal and passively process the input signal to generate an output signal. An embodiment of the receiver includes an input circuit, a dynamic switching circuit, and a switch signal generator. The input circuit is configured to receive an input signal and produce a first output signal. The input circuit includes a passive network configured to condition the input signal. The dynamic switching circuit is configured to perform frequency translation on the first output signal. The switch signal generator is configured to drive the dynamic switching circuit to activate and deactivate the dynamic switching circuit at a sampling frequency that is controlled and stabilized by a frequency control circuit.

Description

technical field [0001] The invention relates to a wireless receiving system. Background technique [0002] A receiver system typically receives an input signal and performs various processing on the input signal to generate one or more output signals. Different receiver system designs provide varying performance characteristics depending on the particular application of the receiver system. Exemplary performance characteristics include frequency selectivity, power consumption of the receiver system, noise figure, one-dB compression point (P 1dB ), third-order intercept point (IP3), dynamic range, and rejection of signal corruption within the receiver system. [0003] Conventional receiver systems provide amplification and frequency translation of the incoming signal while dissipating significant amounts of energy from available power sources, especially components that occur earlier in the RF signal path (eg, closest to the antenna). These receivers use active components ...

AI Technical Summary

Problems solved by technology

Therefore, the sampling frequency of the receiver is neither well defined nor stable, and the receiver cannot automatically tune to and receive signals from different RF communication channels

Second, because there is no isolation between the VCO and the mixer, the sampling frequency of the mixer can be affected by damage due to pull-in due to coupling of the RF input signal

Furthermore, the sinusoidal shape of the VCO waveform driving the mixer combined with the requirement of non-overlap between the driving phases degrades the linearity and noise performance achieved by the receiver

Finally, the passive switching mixer used in the publication cannot achieve a voltage gain greater than 0dB, thus limiting the overall RF gain and thus impairing the achievable sensitivity for a given power allocation

Images