| 摘要 |
A radio frequency receiver (40) comprises a plurality of parallel receiving paths (31.1, 31.2, 31.n), wherein each path (31.1; 31.2; 31.n) can receive a radio frequency signal in one of a plurality of radio frequency bands and amplify the received signal in a low noise amplifier. The amplified signals from the plurality of parallel paths (31.1, 31.2, 31.n) are combined to one combined radio frequency signal in a common summation node and down- converted to a lower frequency signal in a mixer circuit (5). Each low noise amplifier comprises a low noise transconductance circuit (14) providing a current signal to drive the common summation node, and an automatic gain control circuit in each path compensates for variations in signal strength independently of signal strengths of signals received by the other receiving paths. The receiver is suitable for simultaneous multiple band reception, where received signal strength can vary between the frequency bands. |
