| 摘要 |
<p>The present invention provides an apparatus and method whereby the current flow through an RF power transistor may be monitored without the use of any external parts. More particularly, an RF power transistor (40) includes a silicon die, a pair of interdigitated electrodes formed on the silicon die, each having a multiplicity of parallel electrode fingers and at least one bond pad. Regions of a first type of diffusion are formed beneath electrode fingers of one electrode of the pair of interdigitated electrodes, and regions of a second type of diffusion are formed beneath electrode fingers of another electrode of the pair of interdigitated electrodes. One electrode has multiple electrode fingers (E1, ..., En) and multiple resistors formed on the silicon die, at least one resistor connected in series with each one of the electrode fingers. A further electrode is provided having at least one electrode finger (En+1, En+2) and connected to a further bond pad (R), and at least one resistor is formed on the silicon die and connected in series with the further electrode. A method is also provided for monitoring and controlling current flow in an integrated RF transistor within an RF transistor cicuit. The RF transistor circuit includes a bias control and feedback circuit connected to the further bond pad (R). Current flowing through at least one of the emitter ballast resistors is routed to the circuit for monitoring current flow. Using the bias control and feedback circuit, the current flowing through the integrated RF transistor is influenced.</p> |
