======================COIL_INDUCTANCE====================== __\_ H | / | L_cm _______________|_____________ |\ --> I | \ W_cm \ \_____________|______________\ \|____________\|/______________| T_cm | V |_/_ L_uH = 0.002*L_cm*( ln(2*L_cm/( W_cm +T_cm ) +.5 ) ----------------------------------------------------------------------------- <--L_inch----> __ __ __ _/\ \/\ \/\ \___ ^ |__/\ \/\ \/\ \__| | R_inch \_\ \_\ \_\ SELF INDUCTANCE Coil (L_cm,R_cm, N_turns) L_uH (N_turns*R_inch)^2/(9*R_inch + 10*L_inch) ----------------------------------------------------------------------------- <-Dia_cm--> __________ ______ | | __ | | -|-|-_| | | | |____| | |________| L_nH= 8.5*Dia_cm*N_turns^(5/3) N_turns ->set 15 Dia_cm ->set =0.01/2.54 L_nH = 8.5*B15*B14^(5/3) ----------------------------------------------------------------------------- The inductance (I), in microhenrys. N number of turns and I inductance in microhenrys. L and R distances in inches. 0 0 0 0 0 0 ^ _________ | R | | | Single Layer air-core Coil |<---L--->| V within 1% or 2% | | I_uH = R^2*N^2/( 9*R + 10*L) |_________| 0 0 0 0 0 0 ----------------------------------------------------------------------------- 0 0 0 0 0 0 0 0 0 0 0 0 ^ _________ | R | | | |<---L--->| V Multiple Layer Coil | | I_uH = 0.8*R^2*N^2/(6*R +19*L +10*B) |_________| 0 0 0 0 0 0 ^ B 0 0 0 0 0 0 | ----------------------------------------------------------------------------- 0 0 ^ _ | R | | | | | V CASE 3: Single layer single row Layer Coil | | I_uH = 0.8*R^2*N^2/( 8*R + 11*B) |_| 0 ^ B 0 | ----------------------------------------------------------------------------- <-Dia_cm--> __________ ______ | | __ | | -|-|-_| | | | |____| | |________| L_nH = 8.5*Dia_cm*N_turns^(5/3) ----------------------------------------------------------------------------- L_uH= (N_turns*R_inch)^2/(9*R_inch + 10*L_inch) _ _ Dia_inch | | | | _| | | |_ / __| |__ \ / / ^ \ \ R_inch/Dia_inch > 2.5 / / /|\ \ \ | | | | | | | R_inch | | \ \ / / \ \__ __/ / \_ --- _/ ------- L_uH =(R_inch/100)*(7.353*log(16*R_inch/Dia_inch)-6.386) --------------------------------Self_Inductance------------------Ñ-- about 9nH for short leads __\_ | / | _______________|_____________ ()_____________\|/____________) | V |_/_ \ ----------------------------------------------------------------------------- _______\_____ I <--- | / | ____________|____ | | \ | _____ /|\ \ \|/ H Field \ | __\__ | \ | _____ | \ | \ | \ ---> I \ | AREA in SPACE DEFINES \____________\ | INDUCTANCE | | |______/______| \ Remember, Current always flows in loops.. CAPACITOR_IMPEDANCE_Ohms 100 .................................... | C . . . | . . L . | . . . | C . L . | . . . 10 |..........C.........L............... | . . . | . C L . . | . . . | . R . . | . R . . 1|___________________________________. 1MHz 10MHz 100MHz FREQUENCY ----------------------------------------------------------------------------- <--L----> _/\\/\\/\\___ ^ |__/\\/\\/\\__| | R in inches \\ \\ \\ L = n^2*( r^2/ (9*r+10*l) ) microhenies L = FormF*D*n^2 in micro henries D in inches FormF = 0.025*(D/L) ----------------------------------------------------------------------------- <---D--> __________ ______ | | __ | | -|-|-_| | | D in cm | |____| | |________| L = 85e-10*D*N^(5/3) n = number turns D in cm on chip modeled a 2.8nH with a Q of 12.5