Analog received signal strength indication in an RF transceiver

An integrated circuit radio transceiver, comprising:

• a first switching element coupled to an output of each of a plurality of receive paths, each receive path including at least one amplification block and mixing block, wherein the first switching element to produce a selected ingoing signal from the plurality of receive paths based upon a first selection signal;
• a common receive path portion to process the selected ingoing signal and to produce an ingoing signal to a baseband processor, the common receive path portion including a variable gain amplifier and a low pass filter, in which the variable gain amplifier is upstream of the low pass filter;
• first, second and third received signal strength indicator (RSSI) blocks coupled to a plurality of nodes of the common receive path portion to produce corresponding first, second and third signal strength indications of analog receive path signals, the first RSSI block coupled to a node associated with an input of the variable gain amplifier, the second RSSI block coupled to a node associated with an output of the variable gain amplifier and the third RSSI block coupled to a node associated with an output of the low pass filter, in which the first and second RSSI blocks include circuitry to reduce a DC offset;
• and
• a second switching element coupled to receive outputs of the first, second and third RSSI blocks to produce a selected signal strength indication based upon a second selection signal.

An integrated circuit radio transceiver, comprising:

• a first switching element to select one of a plurality ingoing signals produced by a plurality of parallel ingoing signal paths, wherein each of the parallel ingoing signal paths includes an amplification circuitry and a mixing circuitry;
• a common receive path portion to process the selected ingoing signal and that includes a low pass filter and a variable gain amplifier disposed upstream of the low pass filter, the common receive path portion defining a first and second nodes disposed upstream of the low pass filter and disposed on opposite sides of the variable gain amplifier, and a third node disposed downstream of the low pass filter;
• first received signal strength indication (RSSI) circuitry to generate RSSIs from the first node, wherein the first RSSI circuitry includes circuitry configured to reduce a DC offset;
• second RSSI circuitry that generates RSSIs from the second node, wherein the second RSSI circuitry includes circuitry configured to reduce a DC offset;
• third RSSI circuitry that generates RSSIs from the third node;
• and
• a second switching element that selects an RSSI from one of the first, second or third RSSI circuitry to couple to a baseband processor.