Patent ID: 9748981
Date: 2017-08-29
CPC Classifications: H03F,H03G,H04B

Claim:
1. A radio frequency receiver configured to receive a plurality of radio frequency bands, the radio frequency receiver comprising a plurality of parallel receiving paths, each receiving path being configured to receive a radio frequency signal in one of the plurality of radio frequency bands and to amplify the received radio frequency signal in a low noise amplifier, the receiver being configured to combine amplified radio frequency signals from the plurality of parallel receiving paths to one combined radio frequency signal in a common summation node and to down-convert the combined radio frequency signal to a lower frequency signal in a mixer circuit, each one of the low noise amplifiers comprising: a low noise transconductance circuit configured to provide a current signal to drive the common summation node, an automatic gain control circuit configured to compensate for variations in signal strength of the radio frequency signal received by the receiving path comprising the low noise amplifier independently of signal strengths of radio frequency signals received by other receiving paths of the radio frequency receiver; and a current driver circuit having an input connected to the common summation node and an output connected to an input of the mixer circuit.