| 摘要 |
<p>A transconductance device particularly suitable for use as a high frequency active filter, having an input stage including at least one field effect transistor (M1) arranged to drive a laser diode (LD1), and an output stage comprising at least one photodiode (PD1) optically coupled to the laser diode. The output stage is preferably provided with a high impedance bias current supply circuit. In an alternative arrangement particularly useful as an operational amplifier, a differential input stage includes a pair of laser diodes LD1 and LD2 optically coupled to respective photodiodes PD1 and PD2 connected in series, the output being taken from the junction of the two photodiodes.</p> |
