WIDEBAND RECEIVER ROBUST TO RADIO FREQUENCY HARMONICS

摘要

A radio frequency (RF) noise-cancelling receiver includes first transconductance cells configured to produce respective weighted current signals proportional to an input voltage signal. The RF receiver includes frequency conversion cells coupled to the first transconductance cells and configured to mix the weighted current signals with a plurality of non-overlapping local oscillator (LO) signals to produce downconverted current signals. The RF receiver includes transimpedance amplifiers coupled to the frequency conversion cells and configured to produce output voltage signals proportional to the downconverted current signals. The transimpedance amplifiers include second transconductance cells. Each of the first and second transconductance cells has an effective transconductance of a first magnitude for frequency components of the input voltage signal arising from a first harmonic and an effective transconductance of a second magnitude less than the first magnitude for frequency components of the input voltage signal arising from harmonics at integer multiples of the first harmonic.

主权项

1. A radio frequency (RF) receiver comprising:
first transconductance cells configured to produce weighted current signals proportional to an input voltage signal along a first downconversion path; a plurality of frequency conversion cells configured to produce downconverted current signals based on a plurality of non-overlapping local oscillator (LO) signals, a current combining component coupled to first frequency conversion cells of the plurality of frequency conversion cells, the current combining component configured to combine each output of the first frequency conversion cells to a current signal bus; and a plurality of transimpedance amplifiers configured to produce output voltage signals proportional to the downconverted current signals, the plurality of transimpedance amplifiers comprising second transconductance cells, the first transconductance cells and the second transconductance cells having an effective transconductance of a first magnitude for frequency components of the input voltage signal arising from a first harmonic and an effective transconductance of a second magnitude for frequency components of the input voltage signal arising from harmonics at integer multiples of the first harmonic, the first magnitude being greater than the second magnitude, the plurality of transimpedance amplifiers having first transimpedance amplifiers coupled to the current combining component to receive the current signal bus along the first downconversion path and second transimpedance amplifiers coupled to at least one second frequency conversion cell of the plurality of frequency conversion cells along a second downconversion path, each of the first transconductance cells coupled to a frequency conversion cell of the first frequency conversion cells, the at least one second frequency conversion cell configured to receive the input voltage signal directly.