射频关键性设计教程Lecture03_Impedance_matching_for_narrow_band_block.pptVIP

Lecture 3 Richard Li, 2009 o T matching network Cs1 Cs2 Ro Zm P Cp (a) Cs1 - Cp - Cs2 vs Cs1 Ls2 Ro Zm P Cp (b) Cs1 - Cp - Ls2 vs Ro Zm P Lp (c) Cs1 - Lp - Cs2 vs Cs1 Cs2 Cs1 Ls2 Ro Zm P Lp (d) Cs1 - Lp - Ls2 vs Figure 17 Different topologies of a π type matching network Ls1 Ls2 Ro Zm P Cp (f) Ls1 - Cp - Ls2 vs Ls1 Cs2 Ro Zm P Cp (e) Ls1 - Cp - Cs2 vs Ls1 Ls2 Ro Zm P Lp (h) Ls1 - Lp - Ls2 vs Ls1 Cs2 Ro Zm P Lp (g) Ls1 - Lp - Cs2 vs Highest cost DC short-circuited DC un-blocked Medium cost Medium cost DC un-blocked Low cost Lowest cost Region’s limitation Low cost Medium cost DC short-circuited Low cost * 8 topologies Topology Inductor number advantages disadvantages Table 7 Advantages and disadvantages of different topologies in a T type matching network (a) CS1 - CP - CS2 0 Lowest cost Region’s limitation (b) CS1 - CP - LS2 1 Low cost (c) CS1 - LP - CS2 1 Low cost (d) CS1 - LP - LS2 2 Medium cost DC short-circuited (e) LS1 - CP - CS2 1 Low cost (f) LS1 - CP - LS2 2 Medium cost DC un-blocked (g) LS1 - LP - CS2 2 Medium cost (h) LS1 - LP - LS2 3 Highest cost DC short-circuited DC un-blocked o Recommended Topologies Consideration of cost Candidates : “Π” type “T” type 1. CP1 - CS - CP2, CS1 - CP - CS2, 2. LP1 – CS - CP2, LS1 - CP - CS2, 3. CP1 - LS - CP2, CS1 - LP - CS2, 5. CP1 - CS - LP2, CS1 - CP - LS2, Table 8 Applied and prohibited regions of an impedance matching network with specific topology (From there the impedance Zm is going to be matched to 50 Ω.) Topolgy Applied regions Prohibited regions “Π” type 1. CP1 - CS - CP2 Region 3 Regions 1, 2, 4 2. LP1 - CS - CP2, Regions 2, 3, 4 Region 1 3. CP1 - LS - CP2, Region