| 摘要 |
A circuit for processing an AC signal includes a first stage having a first active element biased with a first bias voltage (VDD) applied between its first main electrode and its second main electrode. A second bias voltage (VG) is applied between its control electrode and its second main electrode. The control electrode also receives the AC signal. This active element is of the type in which, normally, no bias current passes through the control electrode. The second DC bias voltage is generated at the terminals of a resistor coupled to the control electrode and to the second main electrode by applying to the control electrode an AC signal at a level which will activate the rectifier properties of the active element between its control electrode and its second main electrode.
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