MDC5001T1
APPLICATION CIRCUITS
RF OUT
Step 1: Choose V CC (1.8 V Min to 10 V Max)
Step 2: Insure that Min V ENBL is
>minimum indicated in Figures 5 and 6.
Step 3: Choose bias current, I D , and determine needed gate–source voltage, V GS .
Step 4: Choose I out keeping in mind that too large an I out can impair MDC5000 ∆V ref /∆T J
performance (Figure 2) but too large an R6 can cause I DGO & I GSO to bias on the FET.
•
Step 5: Calculate R6 = (V GS + E GS )
–
I out
•
Step 6: From Figure 1, read V ref for V CC & I out chosen
•
Step 7: Calculate Nominal R5 = (V CC – V ref )
–
(I D + I out) . Tweak as desired.
•
Figure 19. Class A Biasing of a Typical 890 MHz Depletion Mode GaAs FET Amplifier
MDC5001T–10/10
ETL [ E-TECH ELECTRONICS LTD ]
