| 摘要 |
A very simple oscillator circuit, using a FET pair with RF coupled, DC isolated gates, selectively operates at two widely separated microwave frequencies. The two FETs are DC isolated so that one of them can be pinched off (to act as a passive element) while the other remains active. Thus, for example, a two-FET push-push oscillator operating at 20 GHz can switch downband, when one FET is pinched off, to act as a fundamental mode oscillator at 121/2 GHz. The circuit is integrable. In alternative embodiments, more than two FETs are used, for switching over a wider frequency range when one or two of them is pinched off.
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