图5-2 Ina vhf的版图… 49 图5-3 att uhf的版图… 49 图5-4 att vhf的版图 50 图5-5整体可变增益低噪声放大器的版图…50 图5-6UHF最高增益模式低噪声放大器的增益、NF、S11…51 图5-7VHF最高增益模式低噪声放大器的增益、NF、S11…52 图5-8UHF最高增益模式lP3仿真结果…52 图5-9VHF最高增益模式lP3仿真结果… …53 图5-10UHF频段660MHz处S11随增益的变化…53 图5-11VHF频段150MHz处S11随增益的变化 …54 图5-12UHF的增益及增益台阶…55 图5-13VHF的增益及增益台阶… 55 图5-14UHF频段660MHz处噪声系数随增益的变化 56 图5-15VHF频段150MHz处噪声系数随增益的变化 56 图5-16UHF频段lP3随增益的变化 57 图5-17VHF频段P3随增益的变化… 57图 5-2 lna_vhf 的版图··································································· 49 图 5-3 att_uhf 的版图 ··································································· 49 图 5-4 att_vhf 的版图 ··································································· 50 图 5-5 整体可变增益低噪声放大器的版图 ········································· 50 图 5-6 UHF 最高增益模式低噪声放大器的增益、NF、S11 ···················· 51 图 5-7 VHF 最高增益模式低噪声放大器的增益、NF、S11····················· 52 图 5-8 UHF 最高增益模式 IIP3仿真结果 ··········································· 52 图 5-9 VHF 最高增益模式 IIP3仿真结果············································ 53 图 5-10 UHF 频段 660 MHz 处 S11随增益的变化································ 53 图 5-11 VHF 频段 150 MHz 处 S11随增益的变化 ································ 54 图 5-12 UHF 的增益及增益台阶······················································ 55 图 5-13 VHF 的增益及增益台阶······················································ 55 图 5-14 UHF 频段 660 MHz 处噪声系数随增益的变化 ························· 56 图 5-15 VHF 频段 150 MHz 处噪声系数随增益的变化 ························· 56 图 5-16 UHF 频段 IIP3随增益的变化················································ 57 图 5-17 VHF 频段 IIP3随增益的变化················································ 57