TX: RF = | n·BBTX ± m·TX.LO [± r·RX.LO] | • RX equations are solved for the RF that lands on wanted signed BB
Direct hit (RX wanted)RX image hitOther RX mechanism hit
ROM spur (dBc)
Type
TX band(s)
TX mechanism
TX order
TX spur at RF (MHz)
Interference
RX mechanism
RX order
RX target RF (MHz)
Hit in
LOs & IQ baseband
Caps only the BB/intermod coefficient order. Whenever TX.LO and RX.LO participate together, they share the LO budget |m|+|r| ≤ LO coefficient order max. DAC replica index does not add mixer order.