gremlin
Newbie level 5
sa602
Hi,
I am trying to use SA602 to design a mixer/osc mainly because it is readily available and popular. The main problem I have is the oscillator design. The data sheet does not have much information on how to design the oscillator. My goal is to design 150MHz LO using LC as a VCO. The data sheet only has examples for particular frequencies.
I've designed LC osc using transistor before, but it requires knowledge of the gm of the transistor. The design process was to determine the negative resistance of the transistor plus the two caps on Base/Emitter and Emitter to ground. Since the SA602 doesn't have info on the gm of the oscillator transistor, I cannot calculate the values for these two caps.
I figure that this part is very popular, so there must be a lot of engineers having experience with it. Any help on the design will be appreciated.
Andy
Hi,
I am trying to use SA602 to design a mixer/osc mainly because it is readily available and popular. The main problem I have is the oscillator design. The data sheet does not have much information on how to design the oscillator. My goal is to design 150MHz LO using LC as a VCO. The data sheet only has examples for particular frequencies.
I've designed LC osc using transistor before, but it requires knowledge of the gm of the transistor. The design process was to determine the negative resistance of the transistor plus the two caps on Base/Emitter and Emitter to ground. Since the SA602 doesn't have info on the gm of the oscillator transistor, I cannot calculate the values for these two caps.
I figure that this part is very popular, so there must be a lot of engineers having experience with it. Any help on the design will be appreciated.
Andy