strahd_von_zarovich
Advanced Member level 4
Hi Everyone,
I am trying to understand how to choose RF inductor for biasing a RF Amplifier. Some of the amplifiers need inductors and some of them not.
For example in ADL5536 eval board, 470nH inductor is used, but in HMC1114PM5E's eval board no inductor is used. ADL5536's frequency range is between 20MHz-1GHz. HMC1114PM5E's frequency range is 2.7 GHz - 3.3GHz. Is it because 20MHz-1GHz is low so we need 470nH => Z = 2 * 3.14 * 20MHz * 470nH = 59 impedance . For 3 GHz, 3nH gives nearly the same impedance, so maybe trace's inductance is enough?
My second question is should I try to choose inductor value to match 50ohm or higher impedance value is better?
Thanks in advance?
Canberk
I am trying to understand how to choose RF inductor for biasing a RF Amplifier. Some of the amplifiers need inductors and some of them not.
For example in ADL5536 eval board, 470nH inductor is used, but in HMC1114PM5E's eval board no inductor is used. ADL5536's frequency range is between 20MHz-1GHz. HMC1114PM5E's frequency range is 2.7 GHz - 3.3GHz. Is it because 20MHz-1GHz is low so we need 470nH => Z = 2 * 3.14 * 20MHz * 470nH = 59 impedance . For 3 GHz, 3nH gives nearly the same impedance, so maybe trace's inductance is enough?
My second question is should I try to choose inductor value to match 50ohm or higher impedance value is better?
Thanks in advance?
Canberk