| ??? 12/29/09 23:07 Modified: 12/29/09 23:10 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#172026 - Some answers... Responding to: ???'s previous message |
Chitrakar said:
(1) Is forward transconductance same as mutual conductance? As far as I know, yes. Chitrakar said:
(2)On the datasheet (on fig 1), there is a curve on the left (with Vds=10V and Idss). I could not figure out what this curve is for. A J309/310 having Idss = 70mA usually shows Vgsoff = -5V. A J309/310 having Idss = 50mA usually shows Vgsoff = -4V. And so on... Chitrakar said:
(3)There is Rds-Vgs curve on the datasheet (fig 4). This shows Rds is maximum at Vgs=0! My lab tests shows exact opposite of the curve. Is not Rds=Vds/Id?
It's not unusual, that datasheets contain typos... What, if Vgsoff is meant or another capacitance? Kai Klaas |
| Topic | Author | Date |
| Device characterization | 01/01/70 00:00 | |
| DC tests and DC tests | 01/01/70 00:00 | |
| DC test | 01/01/70 00:00 | |
| As I said you need AC and DC tests | 01/01/70 00:00 | |
| Not necessarily... | 01/01/70 00:00 | |
| Datasheet? | 01/01/70 00:00 | |
| None unfortunately | 01/01/70 00:00 | |
| What about other datasheets | 01/01/70 00:00 | |
| Datasheet? | 01/01/70 00:00 | |
| datasheet | 01/01/70 00:00 | |
| I would give this a try... | 01/01/70 00:00 | |
| DC and AC tests | 01/01/70 00:00 | |
| Very useful (but still some confusion) | 01/01/70 00:00 | |
| Some answers... | 01/01/70 00:00 | |
| Rds versus Vgsoff... | 01/01/70 00:00 | |
| Exact match | 01/01/70 00:00 | |
| But with higher Rdon | 01/01/70 00:00 | |
| Should not be important | 01/01/70 00:00 | |
| Which one? | 01/01/70 00:00 | |
| "the amplifier circuit" | 01/01/70 00:00 | |
| Ri versus Rds(on)... | 01/01/70 00:00 | |
| Higher Rd(on) affects Ri? | 01/01/70 00:00 | |
Rd(on) versus gain | 01/01/70 00:00 |