T
Tim Wescott
- Jan 1, 1970
- 0
I'm working on a small, battery powered receiver that I hope to keep
below 1/2 ounce total weight. I need to make a good VCO that will
operate from 100 to 150MHz on 2.7V to 5V with minimal parts count and
hopefully minimal BOM cost. Everything I've done so far has been from a
dependable 12V rail and the more components the better, so this low
voltage, low parts-count stuff is new territory.
At the moment I'm looking at a Colpitts with the base bias derived from
an LM385, and a single MMBV210x for tuning.
VCC
100 +
___ |
.-------o----------o----------o---|___|--'
| | | |
| .-. | |
--- | | C| ---
--- | |10k C| ---
| '-' C| |
| | | || |
=== | o----||----o
GND | | || |
| |/ |
o--------| |
| |> | 10k
| | | || ___ Vtune
\---\ o----------o---||----o----|___|-----o
LM385 /|\ | || |
| .-. ---
| | | ---
=== | | 1k /|\ MMBV210x
GND '-' |
| |
| |
=== ===
GND GND
created by Andy´s ASCII-Circuit v1.24.140803 Beta www.tech-chat.de
I'm fairly confident that this will work, but it has an awful lot of
parts for this application. Any suggestions on how I can do better than
this?
Thanks.
below 1/2 ounce total weight. I need to make a good VCO that will
operate from 100 to 150MHz on 2.7V to 5V with minimal parts count and
hopefully minimal BOM cost. Everything I've done so far has been from a
dependable 12V rail and the more components the better, so this low
voltage, low parts-count stuff is new territory.
At the moment I'm looking at a Colpitts with the base bias derived from
an LM385, and a single MMBV210x for tuning.
VCC
100 +
___ |
.-------o----------o----------o---|___|--'
| | | |
| .-. | |
--- | | C| ---
--- | |10k C| ---
| '-' C| |
| | | || |
=== | o----||----o
GND | | || |
| |/ |
o--------| |
| |> | 10k
| | | || ___ Vtune
\---\ o----------o---||----o----|___|-----o
LM385 /|\ | || |
| .-. ---
| | | ---
=== | | 1k /|\ MMBV210x
GND '-' |
| |
| |
=== ===
GND GND
created by Andy´s ASCII-Circuit v1.24.140803 Beta www.tech-chat.de
I'm fairly confident that this will work, but it has an awful lot of
parts for this application. Any suggestions on how I can do better than
this?
Thanks.