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Design >> RF Design >> AMPLIFIER DESIGN
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Message started by smwk on Oct 9^th, 2013, 11:16am

Title: AMPLIFIER DESIGN
Post by smwk on Oct 9^th, 2013, 11:16am

In designing a two stage power amplifier, can i use BJT or FET in first stage and LDMOS transistor in second stage? What problems can i face? if any..

Title: Re: AMPLIFIER DESIGN
Post by harpoon on Oct 10^th, 2013, 3:39am

The question is really vague ... there are many views, but no one posted as yet. Please post more details if you wish for some sensible answers.

Title: Re: AMPLIFIER DESIGN
Post by smwk on Oct 11^th, 2013, 9:35am

Actually i want 24.33 dB gain..input is 2.5 W input and output is 678 W output and frequency is 1030 MHz....in second stage if i use LDMOS transistor with 17 dB gain(i m using this transistor because it is high power transistor 600 W with known s-parameters...at such high power mostly the manufacturer does not give s-parameters but gives test circuit)...now for first stage i want transistor with 7 dB gain and on required frequency of operation as far as i have searched mostly LDMOS transistors have high gains ...so dats y i was asking whether BJT or FET transistor is used which have not much higher gains....hope i am making sense...