class A RF power amplifier
constants:c
Parameters
frequency
f
\(Hz\)
Output Power
Po
\(W\)
Band width
BW
\(Hz\)
PS Voltage
`V_I`
\(V\)
Min DS voltage
`V_{DSmin}`
\(V\)
Resonant efficiency
`\eta_r`
\(\)
Output
output voltage `V_m`
`V_m=V_I-V_{DSmin}`
Quality factor `Q_L`
`Q_L=f/{BW}`
drain efficiency `eta_D`
`eta_D=1/2-V_{DSmin}/{2V_I}`
Total efficiency `eta`
`eta=eta_D eta_r`
dc supply power `P_I`
`P_I eta=P_o`
drain ac power `P_{DS}`
`P_{DS}=P_I eta_D`
power loss in the transistor `P_D`
`P_D=P_I-P_{DS}`
maximum DS voltage `V_{DSmax}`
`V_{DSmax}=V_I+V_m`
Load resistance R
`P_O=V_m^2/{2R}`
resonant inductance L
`Q_L=R/{omega_0 L}`
resonant capacitance C
`Q_L=1/(omega_0 C)//R`
choke inductance `L_f`
`X_{Lf}=omega_0 L_f=10R`
coupling capacitor `C_c`
`X_{Cc}=R/10=1/(omega_0 C_c)`
load current `I_m`
`I_m=I_D=V_m/R`
max drain current `I_{DM}`
`I_{DM}=I_D+I_m`