Terminator3
Advanced Member level 3
Hello! Is it good idea to use amplifier stable mmic as basic element of parallel feedback oscillator?
Good transistors have high frequency capablities, and in wrong design they oscillate regardless of feedback, at some high frequency, i guess where K is far below -1 and some feedback on transistor leads is high. What about mmics?
MMICS has very good features, as:
1. high gain
2. unconditional stable (so frequency determined only by parallel feedback)
3. internally matched
4. cheap
Problems:
1. is it enough to have high gain to start oscillation?
2. some MMICS have 2 or even 3 active devices inside, connected in series, is it ok?
3. many MMICS have no S-parameters, S21 must be found by experiment
Good transistors have high frequency capablities, and in wrong design they oscillate regardless of feedback, at some high frequency, i guess where K is far below -1 and some feedback on transistor leads is high. What about mmics?
MMICS has very good features, as:
1. high gain
2. unconditional stable (so frequency determined only by parallel feedback)
3. internally matched
4. cheap
Problems:
1. is it enough to have high gain to start oscillation?
2. some MMICS have 2 or even 3 active devices inside, connected in series, is it ok?
3. many MMICS have no S-parameters, S21 must be found by experiment